Dipt era 285 
DIPTERA (Mosquitoes, Midges, Flies) 
a. Integument leathery, abdominal segments indistinct; wings often wanting; 
parasitic forms.PUPIPARA 
b. Head folding back on the dorsum of the thorax; wingless flies parasitic 
on bats. Genus Nycteribia . Nycteribiid^: 
bb. Head not folding back upon the dorsum of the thorax; flies either winged 
or wingless; parasitic on birds and on bats and other mammals, 
c. Antennae reduced, wings when present, with distinct parallel veins and 
outer crossveins; claws simple; palpi leaf-like, projecting in front of 
the head. Flies chiefly found on bats. Several genera occur in North 
America . Streblid^e 
162. Hippobosca equina, xq. After Osborn. 
cc. Antennae more elongate, segments more or less distinctly separated; 
head sunk into an emargination of the thorax; wings when present 
with the veins crowded toward the anterior margin; palpi not leaf¬ 
like . HlPPOBOSCIDAs 
d. Wings absent or reduced and not adapted for flight. 
e. Wings and halteres (balancers) absent. M. ovinus, the sheep tick 
. Melophagus Latr. 
ee. Wing reduced (or cast off), halteres present. 
f. Claw bidentate; ocelli present. On deer after the wings are cast 
off. L. depressa . Lipoptena Nitsch 
ff. Claw tridentate (fig. 161 f).On Macropis. B. femorata 
. Brachypteromyia d Will. 
dd. Wings present and adapted for flight, 
e. Claws bidentate. 
f. Ocelli present; head flat; wings frequently cast off. On birds 
before casting of the wing . Lipoptena Nitsch. 
ff. Ocelli absent; head round; wings present. The horse tick 
H. equina may attack man (fig. 162) . Hippobosca L. 
ee. Claws tridentate (fig. 161 f.). 
f. Anal cell closed at apical margin by the anal crossvein. 
g. Ocelli absent . Stilbometopa Coq. 
gg. Ocelli present. 
