1. Segments of body with conspicuous dorsal tubercules and/or setae. . . . . . . . . . . . . . . . . 2
Segments of body without dorsal tubercules and setae. . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Lateral processes on body segments at least as long as segments. . . . . . . . . . Atrichopogon
Lateral processes on body segments absent or less than half length of segments; cross section
of body circular. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Forcipomyia sp.3. Stout setae on anal division of about one third length of division; ventral side of posterior collar
of head with triangular or hemispherical expansion. . . . . . . . . . . . . . . . . . . . Culicoides sp.Stout setae on anal division at least one half length of division; posterior collar of head of
uniform width ventrally, or if expansion present, head less than 1.7 times as long as wide. .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bezzia sp.
Key to Genera of Ceratopogonidae Nymphs