826 



THE DIPTERA 



philus, (Estrus, Hypoderma, etc. ; and (b) Cuter ehrincB, with a well- 

 developed retractile proboscis, including Dermatohia, etc. The 

 four genera of interest to us may be recognized as follows: — 



Fig. 416. — Hypoderma hovis de ^Geer. ^ (X 2|^.) 



I. Wing without posterior transverse vein; the media runs towards 

 the posterior border. First posterior cell is partly open. 



Arista naked — Gastrophilus Leach, 18 17. 

 II. Wing with posterior transverse vein. The 

 media at its end is bent towards the 

 radius, and the first posterior cell is 

 either open, partially open, or closed. 



A. Facial grooves approximated below. First 

 posterior cell closed and petiolate body 

 nearly bare — (Estrus Linnaeus, 1758. 



B. Facial grooves remote. 

 {a) Proboscis straight, capable of being 



extended, or entirely rudimentary. 

 Antennal groove with small angular 

 dividing wall. Palpi absent — Hypo- 

 derma Latreille, 1825. 

 (b) Proboscis bent and capable of being 

 drawn into a deep cavity on the under 

 surface of the head, and generally 

 hidden therein. Arista with hairs on 

 the upper side. Third antennal 

 ^%t7a^^a'^''to:is 30i"t "J"* longer than the first two- 



DE Geer. {X^i') ' D ermato Ota Br diMeT, 1000. 



