Diptera 285 



DIPTERA (Mosquitoes, Midges, Flies) 



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^E 



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. X4. 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 HlPPOBOSCIDjE 



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 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. 



