| Species | Mesoleius abbreviatus Brischke, 1871
| | |
| Species | Mesoleius abdominalis Brischke, 1871
| | |
| Species | Mesoleius abietinus Teunissen, 1945
| | |
| Species | Mesoleius aceris Kasparyan & Shaw, 2003
| | |
| Species | Mesoleius admirabilis Kasparyan, 2000
| 2 | Subspecies |
| Species | Mesoleius aemulus Ruthe, 1859 ⇒ Mesoleius nivalis
| | |
| Species | Mesoleius aequabilis Holmgren, 1876
| | |
| Species | Mesoleius affinis Brischke, 1892 ⇒ Mesoleius minor
| | |
| Species | Mesoleius agilis Brischke, 1871
| | |
| Species | Mesoleius aglaia Teunissen, 1953
| | |
| Species | Mesoleius albilabris Thomson, 1893
| | |
| Species | Mesoleius albopictus Brischke, 1892
| | |
| Species | Mesoleius alboscutum Teunissen, 1953 ⇒ Mesoleius armillatorius
| | |
| Species | Mesoleius albotibialis Strobl, 1903
| | |
| Species | Mesoleius alekhinoi Kasparyan, 2000
| | |
| Species | Mesoleius alni Woldstedt, 1874 ⇒ Campodorus haematodes
| | |
| Species | Mesoleius alpinus Strobl, 1902
| | |
| Species | Mesoleius altalpinus Bauer, 1985
| | |
| Species | Mesoleius alticola Holmgren, 1857
| | |
| Species | Mesoleius altissimus Bauer, 1985
| | |
| Species | Mesoleius alutaceus Woldstedt, 1874 ⇒ Syndipnus alutaceus
| | |
| Species | Mesoleius amabilis Holmgren, 1857 ⇒ Mesoleius axillaris
| | |
| Species | Mesoleius amictus Holmgren, 1857
| | |
| Species | Mesoleius analis Brischke, 1878
| | |
| Species | Mesoleius anceps Holmgren, 1857
| | |
| Species | Mesoleius annulatus Brischke, 1871 ⇒ Phytodietus vulgaris
| | |
| Species | Mesoleius annulifer Kasparyan, 2000 ⇒ Mesoleius euphrosyne
| | |
| Species | Mesoleius annulipes Thomson, 1883
| | |
| Species | Mesoleius antennator Kasparyan, 2000 ⇒ Mesoleius lindemansi
| | |
| Species | Mesoleius arctophylax Marshall, 1877
| | |
| Species | Mesoleius ardonator Kasparyan, 2000
| | |
| Species | Mesoleius arduus Kasparyan, 2000
| | |
| Species | Mesoleius armillatorius Gravenhorst, 1807
| | |
| Species | Mesoleius articularis Davis, 1897
| | |
| Species | Mesoleius assiduus Holmgren, 1876
| | |
| Species | Mesoleius astutus Holmgren, 1876
| | |
| Species | Mesoleius ater Kasparyan, 2001
| | |
| Species | Mesoleius atratus Kasparyan, 2000
| | |
| Species | Mesoleius attenuatus Bridgman, 1887
| | |
| Species | Mesoleius audax Davis, 1897
| | |
| Species | Mesoleius aulicus Gravenhorst, 1829
| 2 | Subspecies |
| Species | Mesoleius aullcus Gravenhorst, 1829
| | |
| Species | Mesoleius autumnalis Woldstedt, 1874 ⇒ Campodorus autumnalis
| | |
| Species | Mesoleius axillaris Stephens, 1835
| | |
| Species | Mesoleius balearicus Kriechbaumer, 1894
| | |
| Species | Mesoleius balteatus
| | |
| Species | Mesoleius bicolor Gravenhorst, 1829
| | |
| Species | Mesoleius bignellii Bridgman, 1881
| | |
| Species | Mesoleius bipunctatus Brischke, 1871
| | |
| Species | Mesoleius bisignatus Costa, 1888
| | |
| Species | Mesoleius borealis Holmgren, 1857
| | |
| Species | Mesoleius bovei Holmgren, 1880
| | |
| Species | Mesoleius brachyacanthus Parfitt, 1881
| | |
| Species | Mesoleius brachypus Thomson, 1893
| | |
| Species | Mesoleius breviformis Teunissen, 1945
| | |
| Species | Mesoleius brevipalpis Thomson, 1894
| | |
| Species | Mesoleius brevis Brischke, 1871
| | |
| Species | Mesoleius brevispina Thomson, 1883
| | |
| Species | Mesoleius brevitarsis Thomson, 1893
| | |
| Species | Mesoleius brischkei Dalla Torre, 1901 ⇒ Mesoleius albopictus
| | |
| Species | Mesoleius callidulus Holmgren, 1857
| | |
| Species | Mesoleius canaliculatus Provancher, 1875 ⇒ Mesoleius comeaui
| | |
| Species | Mesoleius caninae Bridgman, 1886
| | |
| Species | Mesoleius carinatus Holmgren, 1857
| | |
| Species | Mesoleius castaneus Habermehl, 1925
| | |
| Species | Mesoleius celator Holmgren, 1876
| | |
| Species | Mesoleius chicoutimiensis Provancher, 1888
| | |
| Species | Mesoleius chyzeri Kiss, 1926 ⇒ Mesoleius armillatorius
| | |
| Species | Mesoleius ciliatus Holmgren, 1857
| | |
| Species | Mesoleius cingulatus Brischke, 1871
| | |
| Species | Mesoleius circumspectus Holmgren, 1876
| | |
| Species | Mesoleius clypealis Thomson, 1893
| | |
| Species | Mesoleius clypearis Brischke, 1878
| | |
| Species | Mesoleius clypeator Kasparyan, 2000
| | |
| Species | Mesoleius cognatus Brischke, 1871
| 2 | Subspecies |
| Species | Mesoleius comeaui Townes, 1945
| | |
| Species | Mesoleius commotus Holmgren, 1876
| | |
| Species | Mesoleius compar Marshall, 1896 ⇒ Mesoleius geniculatus
| | |
| Species | Mesoleius compressiuscula Thomson, 1883
| | |
| Species | Mesoleius compressiventris Strobl, 1902
| | |
| Species | Mesoleius compressus Ratzeburg, 1852 ⇒ Mesoleius grossulariae
| | |
| Species | Mesoleius conformis Davis, 1898
| | |
| Species | Mesoleius conformus Davis, 1897
| | |
| Species | Mesoleius congener Walkley, 1958 ⇒ Mesoleius minor
| | |
| Species | Mesoleius congruens Holmgren, 1858
| | |
| Species | Mesoleius consimilis Holmgren, 1857
| | |
| Species | Mesoleius contiguus Roman, 1909
| | |
| Species | Mesoleius contractus Holmgren, 1857 ⇒ Campodorus clypeatus
| | |
| Species | Mesoleius contrarius Holmgren, 1876 ⇒ Mesoleius grossulariae
| | |
| Species | Mesoleius convergens Davis, 1897 ⇒ Mesoleius insidiosus
| | |
| Species | Mesoleius coriaceus Holmgren, 1857
| | |
| Species | Mesoleius corrugatus Holmgren, 1876
| | |
| Species | Mesoleius crassipes Thomson, 1893
| | |
| Species | Mesoleius crassitarsis Thomson, 1883 ⇒ Mesoleius peronatus
| | |
| Species | Mesoleius cressoni Davis, 1897
| | |
| Species | Mesoleius curtitarsis Thomson, 1883
| | |
| Species | Mesoleius curvicrus Holmgren, 1876 ⇒ Mesoleius grossulariae
| | |
| Species | Mesoleius decipiens Woldstedt, 1877
| | |
| Species | Mesoleius deletus Thomson, 1893
| | |
| Species | Mesoleius depressa Thomson, 1893
| | |
| Species | Mesoleius difformis Holmgren, 1876
| | |
| Species | Mesoleius discedens Holmgren, 1857 ⇒ Mesoleius grossulariae
| | |
| Species | Mesoleius dispar Holmgren, 1857
| | |
| Species | Mesoleius dorsata Thomson, 1888
| | |
| Species | Mesoleius drewseni Holmgren, 1858 ⇒ Mesoleius dubius
| | |
| Species | Mesoleius dubitator Kasparyan, 2000
| | |
| Species | Mesoleius dubius Holmgren, 1857
| | |
| Species | Mesoleius dudinka Kasparyan, 2001
| | |
| Species | Mesoleius dumeticola Teunissen, 1945
| | |
| Species | Mesoleius efferus Holmgren, 1876
| | |
| Species | Mesoleius elegans Parfitt, 1882 ⇒ Campodorus elegans
| | |
| Species | Mesoleius elongatus Brischke, 1871 ⇒ Mesoleius tibialis
| | |
| Species | Mesoleius ephippiger Holmgren, 1876
| | |
| Species | Mesoleius ephippium Tschek, 1869
| | |
| Species | Mesoleius erythrogaster Holmgren, 1876 ⇒ Mesoleius axillaris
| | |
| Species | Mesoleius euphrosyne Teunissen, 1953
| | |
| Species | Mesoleius excavatus Provancher, 1875
| | |
| Species | Mesoleius exiguus Holmgren, 1876
| | |
| Species | Mesoleius exsculptus Brischke, 1871
| | |
| Species | Mesoleius facialis Brischke, 1878
| | |
| Species | Mesoleius faciator Kasparyan, 2001
| | |
| Species | Mesoleius fallax Holmgren, 1857
| | |
| Species | Mesoleius fasciellus Holmgren, 1857
| | |
| Species | Mesoleius femorator Thomson, 1893
| | |
| Species | Mesoleius fennicus Jussila, 1965
| | |
| Species | Mesoleius filicornis Holmgren, 1876
| | |
| Species | Mesoleius flavicaudatus Holmgren, 1857
| | |
| Species | Mesoleius flavicornis Thomson, 1892
| | |
| Species | Mesoleius flavipes Brischke, 1871
| | |
| Species | Mesoleius flavitarsis Thomson, 1893
| | |
| Species | Mesoleius flavoguttatus Gravenhorst, 1829
| | |
| Species | Mesoleius flavopictus Gravenhorst, 1829
| | |
| Species | Mesoleius flavoscutellatus Thomson, 1892
| | |
| Species | Mesoleius forsii Roman, 1912 ⇒ Mesoleius assiduus
| | |
| Species | Mesoleius fraterna Holmgren, 1857
| | |
| Species | Mesoleius fraudator Holmgren, 1857
| | |
| Species | Mesoleius frenalis Thomson, 1894
| | |
| Species | Mesoleius frigidor Kasparyan, 2001
| | |
| Species | Mesoleius frigidus Holmgren, 1857
| | |
| Species | Mesoleius frontatus Thomson, 1894
| | |
| Species | Mesoleius fulvator Kasparyan, 2000
| | |
| Species | Mesoleius furax Holmgren, 1857
| | |
| Species | Mesoleius fuscipes Holmgren, 1857
| | |
| Species | Mesoleius fuscotrochanteratus Strobl, 1903
| | |
| Species | Mesoleius gallicus Thomson, 1893
| | |
| Species | Mesoleius gelidor Kasparyan, 2000
| | |
| Species | Mesoleius geniculatus Holmgren, 1857
| | |
| Species | Mesoleius glyptus Thomson, 1893
| | |
| Species | Mesoleius gracilicornis Holmgren, 1857
| | |
| Species | Mesoleius gracilipes Holmgren, 1857
| | |
| Species | Mesoleius grandis Thomson, 1888
| | |
| Species | Mesoleius granulosus Kasparyan, 2000
| | |
| Species | Mesoleius groenlandicus Roman, 1930
| | |
| Species | Mesoleius grossulariae Ratzeburg, 1852
| | |
| Species | Mesoleius guttiger Holmgren, 1857
| | |
| Species | Mesoleius gymnonychi
| | |
| Species | Mesoleius hamulator Kasparyan, 2000
| | |
| Species | Mesoleius heros Holmgren, 1857
| | |
| Species | Mesoleius heteropus Thomson, 1883
| | |
| Species | Mesoleius hirtus Rudow, 1882
| | |
| Species | Mesoleius holmgreni Schmiedeknecht, 1924
| | |
| Species | Mesoleius humerellus Thomson, 1893
| | |
| Species | Mesoleius hypargyrici Hinz, 1996
| | |
| Species | Mesoleius hyperboreus Holmgren, 1857
| | |
| Species | Mesoleius hypoleucus Teunissen, 1945
| 2 | Subspecies |
| Species | Mesoleius hypomelas Thomson, 1893
| | |
| Species | Mesoleius ignavus Holmgren, 1857
| | |
| Species | Mesoleius immarginatus Thomson, 1893 ⇒ Campodorus immarginatus
| | |
| Species | Mesoleius implicator Kasparyan, 2000
| | |
| Species | Mesoleius improbus Holmgren, 1857
| | |
| Species | Mesoleius incidens Thomson, 1893
| | |
| Species | Mesoleius incisus Thomson, 1894
| | |
| Species | Mesoleius infidus Woldstedt, 1876
| | |
| Species | Mesoleius infuscator Kasparyan, 2000
| | |
| Species | Mesoleius insidiosus Cresson, 1868
| | |
| Species | Mesoleius insularis Roman, 1924
| | |
| Species | Mesoleius integrator Muller, 1776
| | |
| Species | Mesoleius intermedius Gravenhorst, 1829
| 3 | Subspecies |
| Species | Mesoleius irkutensis Kasparyan, 2000
| | |
| Species | Mesoleius juvenilis Holmgren, 1857
| | |
| Species | Mesoleius khasura Kasparyan, 2000
| | |
| Species | Mesoleius kiruna Kasparyan, 2000
| | |
| Species | Mesoleius kola Kasparyan, 2000
| | |
| Species | Mesoleius laevipectus Thomson, 1893
| | |
| Species | Mesoleius laeviusculus Thomson, 1883
| | |
| Species | Mesoleius languidulus Holmgren, 1857
| | |
| Species | Mesoleius lapponator Kasparyan, 2000
| | |
| Species | Mesoleius laricis Teunissen, 1953
| | |
| Species | Mesoleius latipes Brischke, 1871
| | |
| Species | Mesoleius latiscapus Thomson, 1893
| | |
| Species | Mesoleius lautaretor Kasparyan, 2000
| | |
| Species | Mesoleius lautus Tosquinet, 1896
| | |
| Species | Mesoleius leavigatus Gravenhorst, 1820
| | |
| Species | Mesoleius leptogaster Holmgren, 1857 ⇒ Mesoleius axillaris
| | |
| Species | Mesoleius leucomelas Habermehl, 1903
| | |
| Species | Mesoleius leucopygus Holmgren, 1869
| | |
| Species | Mesoleius lindemansi Teunissen, 1953
| | |
| Species | Mesoleius lineatorius Thunberg, 1822 ⇒ Mesoleius subroseus
| | |
| Species | Mesoleius linitus Holmgren, 1857
| | |
| Species | Mesoleius liopleuris Thomson, 1888
| | |
| Species | Mesoleius liosternus Thomson, 1893
| | |
| Species | Mesoleius lituratus Holmgren, 1857
| | |
| Species | Mesoleius lobatus Thomson, 1893
| | |
| Species | Mesoleius loderi Hinz, 1961
| | |
| Species | Mesoleius londoko Kasparyan, 2000
| | |
| Species | Mesoleius longicornutus Dalla Torre, 1901
| | |
| Species | Mesoleius longigena Thomson, 1893
| | |
| Species | Mesoleius longiventris Thomson, 1888
| | |
| Species | Mesoleius luctuosus Holmgren, 1857
| | |
| Species | Mesoleius lunaris Brischke, 1871
| | |
| Species | Mesoleius luteifrons Gravenhorst, 1829 ⇒ Mesoleius armillatorius
| | |
| Species | Mesoleius macropus Thomson, 1893
| | |
| Species | Mesoleius maculator Kasparyan, 2001
| | |
| Species | Mesoleius maculatus Brischke, 1871
| | |
| Species | Mesoleius mandibularis Thomson, 1893
| | |
| Species | Mesoleius mediosanguineus Heinrich, 1950
| | |
| Species | Mesoleius melanius Roman, 1909
| | |
| Species | Mesoleius melanocarus Thomson, 1893
| | |
| Species | Mesoleius melanogaster Holmgren, 1857
| | |
| Species | Mesoleius melanoleucus Gravenhorst, 1829
| 2 | Subspecies |
| Species | Mesoleius melanurus Constantineanu, 1973
| | |
| Species | Mesoleius meridionalis Holmgren, 1856
| | |
| Species | Mesoleius mesoxantha Thomson, 1893
| | |
| Species | Mesoleius mica Kasparyan, 2001
| | |
| Species | Mesoleius minor Ashmead, 1902
| | |
| Species | Mesoleius mixticolor Heinrich, 1953
| | |
| Species | Mesoleius mixtus Holmgren, 1857
| | |
| Species | Mesoleius modestus Holmgren, 1876
| | |
| Species | Mesoleius molestus Holmgren, 1857
| | |
| Species | Mesoleius mollator Kasparyan, 2000
| | |
| Species | Mesoleius montegratus Bauer, 1985
| | |
| Species | Mesoleius monticola Holmgren, 1857
| | |
| Species | Mesoleius nemati Thomson, 1895
| | |
| Species | Mesoleius nematicidus Horstmann, 1984
| | |
| Species | Mesoleius nigrans Kasparyan, 2001
| | |
| Species | Mesoleius nigriscuta Thomson, 1888
| | |
| Species | Mesoleius nigromica Kasparyan, 2001
| | |
| Species | Mesoleius nigropalpis Brischke, 1871
| | |
| Species | Mesoleius nimis Heinrich, 1950
| | |
| Species | Mesoleius nivalis Holmgren, 1857
| | |
| Species | Mesoleius notator Kasparyan, 2001
| | |
| Species | Mesoleius nubilis Holmgren, 1857
| | |
| Species | Mesoleius obliquus Thomson, 1894
| | |
| Species | Mesoleius obscura Holmgren, 1857
| | |
| Species | Mesoleius obtusator Kasparyan, 2001
| | |
| Species | Mesoleius obtusus Holmgren, 1857
| | |
| Species | Mesoleius olympiae
| | |
| Species | Mesoleius omolon Kasparyan, 2001
| | |
| Species | Mesoleius opticus Gravenhorst, 1829
| 2 | Subspecies |
| Species | Mesoleius orbitalis Thomson, 1893
| | |
| Species | Mesoleius ornatus Habermehl, 1925
| | |
| Species | Mesoleius palmeni Woldstedt, 1874
| | |
| Species | Mesoleius pannicularius Holmgren, 1857
| | |
| Species | Mesoleius parumpictus Roman, 1909
| | |
| Species | Mesoleius parvus Holmgren, 1857
| | |
| Species | Mesoleius patagiatus Holmgren, 1876
| | |
| Species | Mesoleius pectoralis Brischke, 1871
| | |
| Species | Mesoleius perbellus Teunissen, 1945
| | |
| Species | Mesoleius peronatus Marshall, 1876
| | |
| Species | Mesoleius perspicuus Holmgren, 1857
| | |
| Species | Mesoleius pertaesor Kasparyan, 2001
| | |
| Species | Mesoleius pertinax Davis, 1897
| | |
| Species | Mesoleius pervicax Holmgren, 1876
| | |
| Species | Mesoleius phyllotamae
| | |
| Species | Mesoleius phyllotomae Cushman, 1933
| | |
| Species | Mesoleius picticoxa Thomson, 1894
| | |
| Species | Mesoleius pictipes Habermehl, 1923
| | |
| Species | Mesoleius pictus Brischke, 1871
| | |
| Species | Mesoleius pineti Thomson, 1893
| | |
| Species | Mesoleius pini Bridgman, 1882
| | |
| Species | Mesoleius placidus Holmgren, 1857
| | |
| Species | Mesoleius polita Holmgren, 1857
| | |
| Species | Mesoleius polyblastoides Kriechbaumer, 1897
| | |
| Species | Mesoleius pseudoliturata Strobl, 1903
| | |
| Species | Mesoleius pubescens Holmgren, 1857
| | |
| Species | Mesoleius pulchranotus Davis, 1897
| | |
| Species | Mesoleius pulverulentus Holmgren, 1857
| | |
| Species | Mesoleius punctulatus Woldstedt, 1877
| | |
| Species | Mesoleius pusio Holmgren, 1857
| | |
| Species | Mesoleius pyriformis Ratzeburg, 1852
| | |
| Species | Mesoleius referendus Heinrich, 1953
| | |
| Species | Mesoleius renovata Morley, 1911
| | |
| Species | Mesoleius ribesii Bauer, 1961 ⇒ Mesoleius urbanus
| | |
| Species | Mesoleius robustus Provancher, 1883
| | |
| Species | Mesoleius roepkei Teunissen, 1945
| | |
| Species | Mesoleius roepkii Teunissen, 1945
| | |
| Species | Mesoleius romani Teunissen, 1945 ⇒ Mesoleius tenthredinis
| | |
| Species | Mesoleius rubidus Thomson, 1883
| | |
| Species | Mesoleius ruficollis Holmgren, 1857
| | |
| Species | Mesoleius rufogibbosus Kriechbaumer, 1897
| | |
| Species | Mesoleius rufonotata Holmgren, 1876
| | |
| Species | Mesoleius rufopectus Provancher, 1888
| | |
| Species | Mesoleius rugipleuris Heinrich, 1952
| | |
| Species | Mesoleius saami Kasparyan, 2001
| | |
| Species | Mesoleius sahlbergi Woldstedt, 1874 ⇒ Campodorus lituratus
| | |
| Species | Mesoleius sanguinosus Holmgren, 1855
| | |
| Species | Mesoleius scutellaris Rudow, 1886
| | |
| Species | Mesoleius scutellatus Bridgman, 1893 ⇒ Mesoleius armillatorius
| | |
| Species | Mesoleius segmentator Holmgren, 1857
| | |
| Species | Mesoleius seida Kasparyan, 2000
| | |
| Species | Mesoleius semipunctus Teunissen, 1945
| | |
| Species | Mesoleius senilis Holmgren, 1876
| | |
| Species | Mesoleius septentrionalis Ratzeburg, 1852 ⇒ Mesoleius grossulariae
| | |
| Species | Mesoleius sepulchralis Holmgren, 1876
| | |
| Species | Mesoleius signator Roman, 1909
| | |
| Species | Mesoleius similis Brischke, 1892 ⇒ Mesoleius armillatorius
| | |
| Species | Mesoleius simulans Holmgren, 1857
| | |
| Species | Mesoleius sincerus Holmgren, 1857
| | |
| Species | Mesoleius sinuatus Thomson, 1893 ⇒ Mesoleius intermedius
| | |
| Species | Mesoleius smitsvanburgsti Teunissen, 1945
| | |
| Species | Mesoleius sobicola Kasparyan, 2001
| | |
| Species | Mesoleius sobrinus Holmgren, 1876
| | |
| Species | Mesoleius spoliatus Teunissen, 1945
| | |
| Species | Mesoleius spurius Holmgren, 1857
| | |
| Species | Mesoleius stejnegeri Ashmead, 1899
| | |
| Species | Mesoleius stenocerus Thomson, 1893
| | |
| Species | Mesoleius stenostigma Thomson, 1894
| | |
| Species | Mesoleius stipator Holmgren, 1857
| | |
| Species | Mesoleius strobli Habermehl, 1925
| | |
| Species | Mesoleius styriacus Heinrich, 1953
| | |
| Species | Mesoleius subcoriaceus Strobl, 1903
| | |
| Species | Mesoleius subfasciatus Holmgren, 1857
| | |
| Species | Mesoleius submarginatus Cresson, 1864
| | |
| Species | Mesoleius subroseus Thomson, 1888
| | |
| Species | Mesoleius subtilis Holmgren, 1857
| | |
| Species | Mesoleius suspicax Holmgren, 1876
| | |
| Species | Mesoleius tarsalis Cresson, 1868
| | |
| Species | Mesoleius tarsator Roman, 1909
| | |
| Species | Mesoleius tasarensis Kasparyan, 2001
| | |
| Species | Mesoleius tegularis Thomson, 1893
| | |
| Species | Mesoleius tegulator Kasparyan, 2001
| | |
| Species | Mesoleius tenebrosus Roman, 1909
| | |
| Species | Mesoleius tenellus Holmgren, 1857
| | |
| Species | Mesoleius tenthredinis Morley, 1912
Ichneumonid wasp | | |
| Species | Mesoleius tenuitarsis Thomson, 1893
| | |
| Species | Mesoleius tenuiventris Holmgren, 1858 ⇒ Mesoleius axillaris
| | |
| Species | Mesoleius terpeji Kasparyan, 2001
| | |
| Species | Mesoleius thalia Teunissen, 1953
| | |
| Species | Mesoleius thuringiacus Habermehl, 1925
| | |
| Species | Mesoleius tibialis Holmgren, 1857
| | |
| Species | Mesoleius tibiator Kasparyan, 2000
| | |
| Species | Mesoleius tinctor Kasparyan, 2001
| | |
| Species | Mesoleius titarensis Kasparyan, 2001
| | |
| Species | Mesoleius tixi Kasparyan, 2001
| | |
| Species | Mesoleius tolmachevi Kasparyan, 2001
| | |
| Species | Mesoleius tornei Kasparyan, 2001
| | |
| Species | Mesoleius torpescor Kasparyan, 2001
| | |
| Species | Mesoleius torvus Holmgren, 1876
| | |
| Species | Mesoleius transfuga Holmgren, 1857
| | |
| Species | Mesoleius tricolor Thomson, 1883
| | |
| Species | Mesoleius tricoloripes Costa, 1886
| | |
| Species | Mesoleius trimaculatus Stephens, 1835
| | |
| Species | Mesoleius tristis Holmgren, 1857
| | |
| Species | Mesoleius trochanteratus Brischke, 1871
| | |
| Species | Mesoleius ulbrichti Teunissen, 1953
| | |
| Species | Mesoleius unifasciatus Holmgren, 1857 ⇒ Mesoleius pyriformis
| | |
| Species | Mesoleius urbanus Teunissen, 1945
| | |
| Species | Mesoleius ussuriensis Kasparyan, 2000
| | |
| Species | Mesoleius ustulata Holmgren, 1857
| | |
| Species | Mesoleius varicoxa Thomson, 1894
| | |
| Species | Mesoleius variegatus Jurine, 1807
| | |
| Species | Mesoleius versutus Holmgren, 1857
| | |
| Species | Mesoleius vestergreni Roman, 1909
| | |
| Species | Mesoleius vicinus Holmgren, 1857
| | |
| Species | Mesoleius viduus Holmgren, 1857
| | |
| Species | Mesoleius visoris Davis, 1897 ⇒ Mesoleius insidiosus
| | |
| Species | Mesoleius vitosaensis Gregor, 1933
| | |
| Species | Mesoleius wahlbergii Holmgren, 1876 ⇒ Mesoleius grossulariae
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| Species | Mesoleius zonifer Heinrich, 1951
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