Species list, Checklist of Infraorder Araneomorphi for El Cerrito (Contra Costa County, California, USA)

Ants	Arachnids
Bees	Beetles
Booklice	Bugs
Bumblebees	Butterflies
Cicadas	Crane flies
Dragonflies	Earwigs
Flies	Isopods
Locusts	Mantises
Mayflies	Mosquitoes
Myriapods	Net-winged
Plant-parasitic	Scorpion flies
Termites	Wasps

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INSECTOIDGERENGDARK LIGHT

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Checklist for Infraorder Araneomorphi Smith, 1902
and region El Cerrito (Contra Costa County, California, USA)

Class	Arachnida Lamarck, 1801 Arachnids	7 8 8	Families Genera Species	Taxom
Subclass	Micrura Ehrenberg, 1831	7 8 8	Families Genera Species	Taxom
Infraclass	Megoperculata Börner, 1902	2 3 3	Families Genera Species	Taxom
Order	Araneae Clerck, 1757 Spider, Spiders, True Spiders	2 3 3	Families Genera Species	Taxom
Suborder	Araneomorphae Smith, 1902 True Spiders	2 3 3	Families Genera Species	Taxom
Infraorder	Araneomorphi Smith, 1902	2 3 3	Families Genera Species	Taxom

List of families for El Cerrito (Contra Costa County)
2 Families width 3 Species

Theridiidae Sundevall, 1833	Cobweb And Widow Spiders	2	Species	Taxom
Gnaphosidae (Pocock, 1898)	Flat-bellied ground spiders	1	Species	Taxom

Genera for El Cerrito (Contra Costa County)
3 Genera with 3 Species

Latrodectus Walckenaer, 1775	Black widow spider	1	Species	Taxom
Scotophaeus Simon, 1871		1	Species	Taxom
Steatoda Sundevall, 1838	False black widows	1	Species	Taxom

Species list for El Cerrito (Contra Costa County)
3 Species

Latrodectus mactans (Fabricius, 1775)	⇒ Latrodectus tredecimguttatus Rossi, 1790
Scotophaeus blackwalli (Thorell, 1871)	⇒ Scotophaeus peninsularis Carl Friedri..., 1928
Steatoda grossa C. L. Koch, 1838	Brown house spider