| Allocapnia aurora Ricker, 1952 | Aurora Snowfly |
| Allocapnia granulata Claassen, 1924 | Common Snowfly |
| Allocapnia nivicola Fitch, 1847 | Brook Snowfly |
| Allocapnia pygmaea Burmeister, 1839 | Pygmy Snowfly |
| Allocapnia recta Claassen, 1924 | Eastern Snowfly |
| Allocapnia rickeri Frison, 1929 | Midwest Snowfly |
| Allocapnia vivipara Claassen, 1924 | Shortwing Snowfly |
| Allocapnia wrayi Ross, 1964 | Pristine Snowfly |
| Arsapnia arapahoe Nelson & Kon..., 1988 | Arapahoe Snowfly |
| Arsapnia coyote Nelson & Bau..., 1987 | Coyote Snowfly |
| Arsapnia decepta (Banks, 1897) | ⇒ Capnia decepta Banks, 1897 |
| Arsapnia pileata Jewett, 1966 | Birdhead Snowfly |
| Arsapnia sequoia Nelson & Bau..., 1987 | Sequoia Snowfly |
| Arsapnia teresa Claassen, 1924 | Bernardino Snowfly |
| Arsapnia tumida Claassen, 1924 | Swollen Snowfly |
| Arsapnia utahensis Gaufin & Jewett, 1962 | Utah Snowfly |
| Bolshecapnia maculata Jewett, 1954 | Spotted Snowfly |
| Bolshecapnia milami Nebeker & Ga..., 1967 | Glacier Snowfly |
| Bolshecapnia missiona Baumann & Po..., 2007 | Mission Snowfly |
| Bolshecapnia sasquatchi Ricker, 1965 | Sasquatch Snowfly |
| Bolshecapnia spenceri Ricker, 1965 | Ice Snowfly |
| Capnia arapahoe (Nelson & Kon..., 1988) | ⇒ Arsapnia arapahoe Nelson & Kon..., 1988 |
| Capnia barberi Claassen, 1924 | Plumas Snowfly |
| Capnia californica Claassen, 1924 | California Snowfly |
| Capnia cheama Ricker, 1965 | Cheama Snowfly |
| Capnia coloradensis Claassen, 1937 | Colorado Snowfly |
| Capnia confusa Claassen, 1936 | Widespread Snowfly |
| Capnia coyote (Nelson & Bau..., 1987) | ⇒ Arsapnia coyote Nelson & Bau..., 1987 |
| Capnia decepta Banks, 1897 | Shortbeak Snowfly |
| Capnia elongata Claassen, 1924 | Cascades Snowfly |
| Capnia erecta Jewett, 1955 | Erect Snowfly |
| Capnia excavata Claassen, 1924 | Saddleback Snowfly |
| Capnia fialai Nelson & Bau..., 1990 | Humboldt Snowfly |
| Capnia giulianii Nelson & Bau..., 1987 | Whitney Snowfly |
| Capnia glabra Claassen, 1924 | Smooth Snowfly |
| Capnia gracilaria Claassen, 1924 | Slender Snowfly |
| Capnia hitchcocki Nelson & Bau..., 1987 | Arroyo Snowfly |
| Capnia hornigi Baumann & Sh..., 1984 | Esmeralda Snowfly |
| Capnia inyo Nelson & Bau..., 1987 | Inyo Snowfly |
| Capnia jewetti Frison, 1942 | Spring Snowfly |
| Capnia kersti Nelson, 2004 | Eugene Snowfly |
| Capnia lacustra Jewett, 1965 | Lake Snowfly |
| Capnia licina Jewett, 1954 | Bent Snowfly |
| Capnia lineata Hanson, 1943 | Straight Snowfly |
| Capnia maculatus | |
| Capnia mariposa Nelson & Bau..., 1987 | Mariposa Snowfly |
| Capnia melia Frison, 1942 | Northwest Snowfly |
| Capnia mono Nelson & Bau..., 1987 | Mono Snowfly |
| Capnia nana Claassen, 1924 | Dwarf Snowfly |
| Capnia nana nana Claassen, 1924 | |
| Capnia nana wasatchae Nebeker & Ga..., 1967 | |
| Capnia nearctica Banks, 1918 | Nearctic Snowfly |
| Capnia nedia Nebeker and ..., 1966 | |
| Capnia nelsoni Kondratieff ..., 2002 | Coffeepot Snowfly |
| Capnia ophiona Nelson & Bau..., 1987 | Snakehead Snowfly |
| Capnia oregona Frison, 1942 | Oregon Snowfly |
| Capnia palomar Nelson & Bau..., 1987 | Palomar Snowfly |
| Capnia petila Jewett, 1954 | Thin Snowfly |
| Capnia pileata (Jewett, 1966) | ⇒ Arsapnia pileata Jewett, 1966 |
| Capnia promota Frison, 1937 | Pacific Snowfly |
| Capnia quadrituberosa Hitchcock, 1958 | Four-knobbed Snowfly |
| Capnia regilla Nelson & Bau..., 1987 | Royal Snowfly |
| Capnia saratoga Nelson & Bau..., 1987 | Saratoga Snowfly |
| Capnia scobina Jewett, 1966 | Rasp Snowfly |
| Capnia sequoia (Nelson & Bau..., 1987) | ⇒ Arsapnia sequoia Nelson & Bau..., 1987 |
| Capnia sextuberculata Jewett, 1954 | Six-knobbed Snowfly |
| Capnia shasta Nelson & Bau..., 2009 | Shasta Snowfly |
| Capnia shepardi Nelson & Bau..., 1987 | Yuba Snowfly |
| Capnia sierra (Nebeker & Ga..., 1965) | ⇒ Utacapnia sierra Nebeker & Ga..., 1965 |
| Capnia spinulosa Claassen, 1937 | San Gabriel Snowfly |
| Capnia teresa (Claassen, 1924) | ⇒ Arsapnia teresa Claassen, 1924 |
| Capnia tumida (Claassen, 1924) | ⇒ Arsapnia tumida Claassen, 1924 |
| Capnia uintahi Gaufin, 1964 | Uintah Snowfly |
| Capnia umpqua Frison, 1942 | Umpqua Snowfly |
| Capnia utahensis (Gaufin & Jewett, 1962) | ⇒ Arsapnia utahensis Gaufin & Jewett, 1962 |
| Capnia valhalla Nelson & Bau..., 1987 | Viking Snowfly |
| Capnia ventura Nelson & Bau..., 1987 | Ventura Snowfly |
| Capnia vernalis Newport, 1848 | Belly Snowfly |
| Capnia willametta Jewett, 1955 | Willamette Snowfly |
| Capnia yoloensis (Baumann & Ga..., 1970) | ⇒ Mesocapnia yoloensis Baumann & Ga..., 1970 |
| Capnia yosemite Nelson & Bau..., 1987 | Yosemite Snowfly |
| Capnia zukeli Hanson, 1943 | Idaho Snowfly |
| Capnura anas Nelson & Bau..., 1987 | Duckhead Snowfly |
| Capnura elevata Frison, 1942 | Thicklimb Snowfly |
| Capnura fibula Claassen, 1924 | Southwest Snowfly |
| Capnura intermontana Nelson & Bau..., 1987 | Intermountain Snowfly |
| Capnura venosa Banks, 1900 | Falcate Snowfly |
| Capnura wanica Frison, 1944 | Intermittent Snowfly |
| Eucapnopsis brevicauda Claassen, 1924 | Short-tailed snowfly |
| Isocapnia abbreviata Frison, 1942 | Shortlimb Snowfly |
| Isocapnia agassizi Ricker, 1943 | Agassiz Snowfly |
| Isocapnia crinita Needham & Cl..., 1925 | Hooked Snowfly |
| Isocapnia eichlini Zenger & Bau..., 2004 | Napa Snowfly |
| Isocapnia grandis Banks, 1907 | Giant Snowfly |
| Isocapnia hyalita Ricker, 1959 | Hyalite Snowfly |
| Isocapnia integra Hanson, 1943 | Alberta Snowfly |
| Isocapnia mogila Ricker, 1959 | Irregular Snowfly |
| Isocapnia palousa Zenger & Bau..., 2004 | Palouse Snowfly |
| Isocapnia rickeri Zenger & Bau..., 2004 | Umatilla Snowfly |
| Isocapnia spenceri Ricker, 1943 | Chilliwack Snowfly |
| Isocapnia vedderensis Ricker, 1943 | Vedder Snowfly |
| Mesocapnia aptera Lee & Baumann, 2011 | Wingless Snowfly |
| Mesocapnia autumna Baumann & Ga..., 1970 | Autumn Snowfly |
| Mesocapnia bakeri Banks, 1918 | Pomona Snowfly |
| Mesocapnia bergi Ricker, 1965 | Yukon Snowfly |
| Mesocapnia bulbosa Nelson & Bau..., 1990 | Bulbous Snowfly |
| Mesocapnia frisoni Baumann & Ga..., 1970 | Plains Snowfly |
| Mesocapnia lapwae Baumann & Ga..., 1970 | Lapwai Snowfly |
| Mesocapnia oenone Neave, 1929 | Wine Snowfly |
| Mesocapnia ogotoruka Jewett, 1964 | Ogotoruk Snowfly |
| Mesocapnia porrecta Jewett, 1954 | Stretched Snowfly |
| Mesocapnia projecta Frison, 1937 | Spined Snowfly |
| Mesocapnia variabilis Klapálek, 1920 | Variable Snowfly |
| Mesocapnia werneri Baumann & Ga..., 1970 | Sabino Snowfly |
| Mesocapnia yoloensis Baumann & Ga..., 1970 | Yolo Snowfly |
| Paracapnia angulata Hanson, 1961 | Angulate Snowfly |
| Paracapnia baumanni Kondratieff ..., 2010 | Mendocino Snowfly |
| Paracapnia boris Stark & Baumann, 2004 | Colusa Snowfly |
| Paracapnia disala Jewett, 1962 | Dirty Snowfly |
| Paracapnia ensicala Jewett, 1962 | Sword Snowfly |
| Paracapnia humboldta Baumann & J...., 2007 | Redwood Snowfly |
| Sierracapnia barberi Claassen, 1924 | Plumas Snowfly |
| Sierracapnia hornigi Baumann & Sh..., 1984 | Esmeralda Snowfly |
| Sierracapnia mono Nelson & Bau..., 1987 | Mono Snowfly |
| Sierracapnia palomar Nelson & Bau..., 1987 | Palomar Snowfly |
| Sierracapnia shepardi Nelson & Bau..., 1987 | Yuba Snowfly |
| Sierracapnia washoe Bottorff & B..., 2015 | Washoe Snowfly |
| Sierracapnia yosemite Nelson & Bau..., 1987 | Yosemite Snowfly |
| Utacapnia columbiana Claassen, 1924 | Columbian Snowfly |
| Utacapnia distincta Frison, 1937 | Distinctive Snowfly |
| Utacapnia imbera Nebeker & Ga..., 1965 | Scappoose Snowfly |
| Utacapnia lemoniana Nebeker & Ga..., 1965 | Wasatch Snowfly |
| Utacapnia logana Nebeker & Ga..., 1965 | Logan Snowfly |
| Utacapnia nedia (Nebeker & Ga..., 1966) | ⇒ Capnia nedia Nebeker and ..., 1966 |
| Utacapnia poda Nebeker & Ga..., 1965 | Gunnison Snowfly |
| Utacapnia sierra Nebeker & Ga..., 1965 | Sierra Snowfly |
| Utacapnia tahoensis Nebeker & Ga..., 1965 | Tahoe Snowfly |
| Utacapnia trava Nebeker & Ga..., 1965 | Yellowstone Snowfly |
