(ESttitdtp:. 137 



tarandi is parasitic in great numbers in the skin of the rein- 

 deer in both Siberia and boreal America. Four or live species 

 of CEstrns live in the nasal sinuses of sheep, antelope, and 

 horse (^Rhlna'strus). One species of Cephaloitnjla lives in the 

 nasal cavities and throat of the camel and buffalo. Six or 

 seven species of Ceplicnomy'ia have been found parasitic in 

 the pharyngeal cavities of various Cervids, while various spe- 

 cies of Cufrehra and Bogenliofo'a have been bred from the 

 skin or scrotum of different rodents, and opossums. Two 

 species of Derrnatohia, from the skin of dogs, cattle, cats, 

 deer, and probably a])es and man. 



TABLE OF GKNEKA. 

 IMAGINES. 



1. Mouth-parts ver}' small or rudimentary ; arista bare. ... 2 

 Proboscis geniculate, insertetl in a deep slit ; female without extricate 



ovipositor ; first posterior cell narrowed or closed ; arista bare or 

 plumose. ........... 5 



2. Face with a median groove. ........ 8 



Face with a broad, gently arched shield-shaj)ed surface; first posterior 



cell narrowed or closed; tegulje large; female with elongated ovi- 

 positor; larvaj hypodermatic. ....... C 



o. The fourtli longitudinal vein runs straight to the margin of the wing; 

 teguljE small; female ovipositor elongate; larvte in stomach and 



intestinal canal. GASXuorHiLUS Leach. 



First posterior cell narrowed or closed; tegula; large; ovipositor not 

 elongate; larvje in nasal and pharyngeal cavities. ... 4 



4. First posterior cell closed and petiolate; body nearly bare. 



(EsTRUs Linne. 

 First posterior cell narrowly oi)en ; body pilose. CEniENOMViA Latreille. 



6. Palpi wanting IIypodekma Latreille. 



Palpi present (Edamagena Latreille. 



0. Arista phuuose on the \ipper side. ....... 7 



Arista bare, short and stout; teguhc large; wings withotit stump at 

 angle of fourth vein (Mexico) Bogeria Austen. 



7, Tarsi l)road, flattened Cutekebra Clark. 



Tarsi slender. ....... Dermatohia Brauer. 



