MUSCIDyE : THE BLOOD-SUCKING MUSCIDtE 159 



Fourth longitudinal vein strongly curved distally, so as to leave the 

 1st posterior cell narrowly open. [Third longitudinal vein 



6. -I without bristles] = Hamatobosca. 

 Fourth longitudinal vein gently curved distally, so as to leave the 



1st posterior cell widely open = 7. 



rThird longitudinal vein with some bristles proximally 



7. -[ = Hamatobia. 



iThird longitudinal vein without bristles = Bdellolarynx. 



(Terminal fleshy part of proboscis reflexed beneath the chitinous 

 part in repose Philamatomyta. 



Terminal fleshy part of proboscis not reflexed in repose (?) 

 Pristirhynchomyia (?). 



Stomoxys, Geoffrey (o-ro'/xa = niouth ; of i;? = sharp). The 

 numerous species of this cosmopolitan genus much re- 

 semble the house-fly in general appearance, but are readily 

 distinguished by the black, shiny, tapering, stiff proboscis 

 (Fig. 58), by the absence of hairs from the lower edge of the 



Fig. 58. — Head of Stomoxys. 



Fig. 69.— Wing of Stomoxys. 



antennal bristle, and by the gentle curve of the 4th longi- 

 tudinal vein (Fig. 59). They not infrequently come into 

 houses and bite man, but their usual victims are domestic 

 animals, and their ordinary haunts are stables, farmyards, 

 and pastures. 



Stomoxys calcitrans, L., the type of the genus, is said by 

 Austen to occur throughout the greater part of the world. 

 To casual view it looks like a house-fly, but it has six or seven 



