Vol. XI] COLE AND LOVETT—LIST OF OREGON D1PTERA 229 



153. Bibiocephala grandis O. S. 

 Common at Hood River along the stream of that name. 

 The first specimens were collected about the middle of May 

 and were seen in large numbers up to the early part of June. 

 They fly clumsily, like some of the tipulids, and will dash 

 headlong into anything that happens to be in their way. 



154. Bibiocephala comstocki Kell. 

 This species emerged later than grandis and was more 

 abundant; its season was much longer and it was more 

 active. In resting on the leaves of plants it would usually 

 fly to the under side of the leaf and hang by its feet. In the 

 swift water of the upper Hood River these flies could be 

 seen flying and hovering close to the surface of the stream; 

 they seemed to prefer shady places and were often flying 

 after sundown. 



Family STRATIOMYID^ 



Fig. 13. Odontomyia hoodiana Bigot 



The so-called "soldier-flies" have a strikingly characteris- 

 tic wing venation; when at rest the wings are laid flat and 

 overlapping on the abdomen. The abdomen is usually broad 

 and flattened. The adults are flower flies, the smaller species 

 being quite active and the larger ones usually slow. 



December 14, 1921 



