Vol. XI] COLE AND LOt'ETT—UST OF OREGON DIPTERA 243 



collected mostly on sandy stretches along the Hood River 

 on bright sunny days (Cole). 



241. Dialineura crassicornis (Will.) 

 Common at Hood River, V-10 to VI-26 (Cole). The 

 habits are like those of Thereva vialis. Williston described 

 the species in the genus Thereva. 



242. Metaphragma planiceps (Loew) 

 Burns, V-19 (B. G. Thompson). 



Family BOMBYLIID^E 



Fig. 21. Epacmus nitidus Cole, n. sp. Drawing of holotype. 



The "bee-flies" are usually more or less covered with fur- 

 like hair and look less like bees than some other flies; one 

 group is furnished with a long proboscis. During the spring 

 and summer they are often seen hovering in the air. They 

 are flower feeders and creatures of the sunshine. Their 

 flight is very quick, but consists of short dashes, and they 

 are often seen resting on the ground or on low plants in 

 the sun. 



The larvae are parasitic, predaceous, or inquilinous. Some 

 are decidedly beneficial, being parasitic on injurious species. 



243. Spogostylum anale (Say) 

 Forest Grove, IX- 15 (Thompson and Cole). A few 

 females were taken along Gale's Creek; the males, with num- 

 bers of other insects, were flying around some small pine 

 trees in the afternoon sunshine. 



