Bibionid
Guides
Dilophus arizonaensis
Dilophus arizonaensis is a species of march fly in the family Bibionidae, first described by Hardy in 1937. Like other members of the genus Dilophus, it is smaller and less robust than the related genus Bibio, often with reddish coloration. The genus is distinguished from Bibio by having a ring of shorter teeth on the front legs rather than long spurs. As with other bibionids, adults are short-lived and emerge in spring, with males forming swarms to attract mates. Larval stages feed on decaying organic matter in soil.
Dilophus stigmaterus
March fly
Dilophus stigmaterus is a species of march fly in the family Bibionidae, first described by Thomas Say in 1823. Like other members of the genus Dilophus, it is typically smaller and less robust than related Bibio species, often with reddish coloration. The genus is distinguished from Bibio by having a ring of shorter teeth on the front legs rather than long spurs. Adults emerge in spring and males form swarms to attract females. Larvae develop in soil and feed on decaying organic matter.