DIPTERA — ASILINA 



15^; 



Oxcera crotchi O.S. 

 Sargus viridus Say. 

 Stratiomyia barbata Loew. 



nevadae Big. 

 maculosis Loew. 

 melanosoma Loew. 



BIBIONINA 



BLEPHAROCERID/C. 



The larvae live in mountain streams. 

 Bibiocephala comstocki Kel. yosemite — Philorus. 



doanei Kel. Liponeura yosemite — Philorus. 



Blepharocera ancilla — Philorus. Philorus ancilla O.S. 



jordani Kel. yosemite O.S. 



ostensakeni Kel. 



SIMULIID/E. 



Buffalo gnats or black flies sometimes become exceedingly annoying on 

 account of their blood sucking habits. The larvae are aqviatic. 

 Simulium argus Wil. 



bracteatum Coq. 



pictipes Hag. 



hirtipes Fries. 



venustum Say. 



vittatum Zet. 



Figure 164 Venation of Simulidfe and 

 related families. 



B!BIONID>E. 



The larvae feed on decaying vegetable substances. 



Fig-ure 165 Bibionid iiy. 



