Vol. XI] COLE AND LOVETT—L1ST OF OREGON D1PTERA 235 



201. Silvius gigantulus (Loew) 

 Corvallis, IV-15; Subalpine regions on Mt. Jefferson, 

 VII-20 (Bridwell) ; Whitman Nat. Forest, VII-11 (Cham- 

 berlin) ; Sumpter, VII-5 (Wilson). 



Family RHAGIONID^ (LEPTID^) 



Fig. 15. Rhagio dimidiata (Loew) 



In these flies the thorax is rounded and the abdomen 

 usually pointed. The mouth parts are prolonged into a beak 

 projecting downward and backward. Some of the species 

 are predaceous but they are as a rule rather sluggish and are 

 often found on flowers. They can be collected in dense 

 woods on the tall grass and ferns and around swampy land. 

 Some of them rest on the trunks of trees, usually head down- 

 ward. The females of Symphoromyia attack man. Some 

 forms are called "snipe flies." The name Leptidae has long 

 been applied to the family but as Rhagio Fabr. has priority 

 over Leptis Fabr. the family name must change accordingly. 



202. Arthroceras pollinosum Will. 

 Forest Grove, VII-8 ( Cole) . A single female of this rare 

 species was taken in a densely wooded section. It was flying 

 about close to the ground over small weeds and grass and 

 was mistaken at the time for a species of Chrysopila. 



