Diptera 



28s 



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. Antenna 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, X4. After Osborn. 



CO. 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 HlPPOBOSCID.*; 



d. Wings absent or reduced and not adapted for flight. 



e. Wings and halteres (balancers) absent. M. minus, 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 _ Will. 



dd. Wings present and adapted for flight. 

 e. Claws bidentate. 



f. Ocelli present; head flat; wings frequently cast ofE. 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 $tilhometopa Coq. 



gg. Ocelli present. 



