ii. Metanotum with setæ. Wyeomyia (found in the United States); and related tropic genera.
bb. Antennæ composed of three segments with a differentiated style or bristle; third segment sometimes complex or annulate, in which case the empodium is usually developed like the pulvilli, i.e., pad-like ([fig. 161 g]).
c. Empodium developed pad-like (pulvilliform) i.e., three nearly equal membranous appendages on the underside of the claw ([fig. 161g]).
d. Squamæ, head, and eyes large; occiput flattened or concave; third segment of the antennæ with four to eight annuli or segments, proboscis adapted for piercing; body with fine hairs, never with bristles; middle tibia with two spurs; wing venation as figured ([fig. 163f]); marginal vein encompasses the entire wing. Horse flies, greenheads, deer flies, gad flies. Tabanidæ[I]
e. Hind tibia with spurs at tip; ocelli usually present. (Pangoninæ)
f. Third joint of the antennæ with seven or eight segments; proboscis usually prolonged.
g. Each section the third antennal segment branched. Central American species, P. festæ. Pityocera G. T.
gg. Sections of the third antennal segment not branched.
h. Upper corner of the eyes in the female terminating in an acute angle; wings of both sexes dark anteriorly. G. chrysocoma, a species from the eastern states. Goniops Ald.
hh. Upper corner of the eye in the female not so terminating; wings nearly uniform in color, or hyaline.