265 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



nets in some of their aerial maneuvers. The larvas are found 

 under leaves and decaying vegetable matter and are probably 

 carniverous. Some species are aquatic or semi-aquatic. The 

 species listed below were determined by Dr. A. L. Melander 

 except where otherwise indicated. 



397. Platypalpus aequalis Loew 

 Hood River, VI-3 (Cole). 



398. Platypalpus crassifemoris Fitch 

 Hood River, VI-3 (Cole). 



399. Tachypeza inusta (Mel.) 

 Viento, VII-1 (Melander). 



400. Leptopeza disparilis Mel. 

 Forest Grove, VI-2 (Cole). 



401. Ocydromia glabricula (Fall.) 

 Forest Grove, V-20 and VI-2 (Cole). 



402. Empimorpha barbata (Loew) 



Hood River, V-7 and Forest Grove, III, IV and V 

 (Cole). Very common in April and May, especially around 

 the flowers of Oregon grape. 



403. Empimorpha comantis Coq. 

 Corvallis, IV-30. 



404. Empis aldrichii Mel. 

 Rock Creek near Corvallis, VI-6 (Cole). 



405. Empis canaster Mel. 

 Reported from Oregon by Melander. 



406. Empis poplitea Loew 



Hood River, V-5, and Forest Grove in May (Cole). 

 Common, and often in swarms in the mating season. As 

 in Empimorpha barbata the males carry their prey near the 

 females as a lure. 



