34 (46). V, 3 forked (plate V, 3-10, 13).

35 (45). O, 61 long, extending (or nearly) to hind margin, or entirely wanting (plate V, 3-9, 13).

36 (39). C, I, (II) much enlarged, appearance of 3 foot-pads (plate VI, 9)

37 (38). Squamæ small, not covering C, III; O, 61 long and distinct (plate V, 3); long bodied flies, head of normal proportions.

Part of Leptidæ, XVII

38 (37). Squamæ very large, hiding the halteres; O, 61 absent (plate V, 13); short round-bodied flies with very small heads.

Cyrtidæ, XXII

39 (36). Empodium small, only 2 foot-pads apparent (plate VI, 10, 11).

40 (41). Vertex hollowed out between the eyes (plate VI, 28).

Asilidæ, XVIII