no. 2070. PARASITIC AND PREDACEOUS DIPTERA— WALTON. 175 



Genus ASILUS Linnaeus. 



ASILUS PRARIENSIS Tucker. 



From mesa; August. 



ASILUS LEUCOPOGON Williston. 



From mesa; August. 



ASILUS TENEBROSUS Williston. 



Abundant in a rocky canyon in foothills July 19. 



Family MUSCIDAE. 



While most of the species mentioned below are not known to be 

 parasitic in habit, the record of their occurrence and habits in this 

 comparatively little known region are deemed of sufficient importance 

 to merit inclusion here. 



Genus PROTOCALLIPHORA Hough. 



PROTOCALLIPHORA CHRYSORRHAEA Meigen. 



Thirty specimens of this fly were reared from a fledgling of the 

 horned lark (Otocoris alpestris) by Mr. Wildermuth June 11. The 

 larvae were contained in purulent sores on the sides of the body near 

 the legs and on the neck. The bird, although weak and emaciated, 

 was able to flutter away after the maggots were removed. It was first 

 discovered by John R. Sandige. 



Genus CALLIPHORA Desvoidy. 

 CALLIPHORA COLORADENSIS Hough. 



This species is common about prairie-dog towns on the mesa. It 

 has the habit of flying into their burrows for some unknown purpose. 

 After entering, the flies can often be heard buzzing, apparently deep 

 down in the tunnel. 



Genus STOMOXYS Geoffry. 

 STOMOXYS CALCITRANS Linnaeus. 



Very abundant as before noted. 



Genus MUSCA Linnaeus. 

 MUSCA DOMESTICA Linnaeus. 



Abundant about Camp. 



Genus MTJSCINA Desvoidy. 



MUSCINA STABULANS Fallen. 



Abundant about Camp. 



Genus PHORMIA Desvoidy. 

 PHORMIA REGINA Meigen. 



Breeding in garbage pits in large numbers. 



