1. Males. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Females. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2. Compound eyes small (ES = 0.0.68 - 0.94); crossveins of forewings not infucated (darkened with brownish tinge); northeast Ohio. . . . . . . . . . Anthopotamus verticis
Compound eyes very small (ES = 0.92-1.25); or tiny (ES = 1.91 - 2.89); crossveins of forewings infucated or not infucated. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Compound eyes very small (ES = 0.92-1.25); crossveins of forewings strongly infucated; northeast Ohio. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Anthopotamus distinctus
Compound eyes tiny (ES = 1.91-2.89); crossveins of forewings infucated or not infucated. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
4. Crossveins of forewings not infuscated; body 11.3 -13.0 mm long. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Anthopotamus myopsCrossveins of forewings infuscate in midregion; body 7.2-9.2 mm long. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Anthopotamus neglectus *
5. Crossveins of forewings not infuscated. . . . . . . . . . . . . . . . . . Anthopotamus myops
Crossveins of forewings slightly to stongly infuscated. . . . . . . . . . . . . . . . . . . . . . . . . 6
6. Body 8.5-9.2 mm long; compound eyes tiny (ES = 2.27-2.61). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Anthopotamus neglectus *
Body 9.5-14.0 mm long; compound eyes very small (ES = 1.42-1.66). . . . . . . . . . . . . . 7
7. Crossveins of forewings stongly infuscated; crossveins of hindwings strongly infuscated. . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . Anthopotamus distinctus
Crossveins aof forewings slightly infuscated; crossveins of hindwings not infuscated. . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . Anthopotamus verticis
* The subspecies in Ohio is Anthopotamus neglectus neglectus.
Key to Ohio Anthopotamus Adult Species