Mycetophilidæ, III
11 (10). Antennæ as in plate II, 7 and 8; coxæ not elongated.
Bibionidæ, IV
12 (7). Ocelli absent.
13 (14). Antennæ (plate II, 9) shorter than B; wings (plate IV, 9) broad.
Simulidæ, V
14 (13). Antennæ (plate II, 10, 11) longer; wings narrow (plate IV 9-11).
Chironomidæ, VI
15 (6). Costa (plate IV, 12-14) around hind margin.
16 (17). Wings held roof-like, hairy; X only at base (plate IV, 12).