Vol. XI] COLE AND LOVETT— LIST OF OREGON DIPTERA 291 



and Childs). 1916, Proc. Ent. Soc. Wash., XVIII, p. 112. 

 The median cross bands on third and fourth segments 

 often are interrupted; occasionally anterior cross band on 

 fourth entirely concealed under posterior margin of third 

 segment and median band reduced to two narrow elongate 

 spots. 



578. Crioprora alopex (O. S.) 



Forest Grove, 111-20 (Cole); Tillamook, 111-26 (Bur- 

 rill) ; Mary's Peak, 111-30 (Lovett). 



579. Crioprora cyanella (O. S.) 

 Corvallis, V-15 (Black). 



580. Crioprora femorata Will. 



Dee and Hood River, V and VI (Cole) ; Mary's Peak, 

 VI (Lovett). 



581. Cynorhina armillata (O. S.) 

 Mary's Peak, VI-15; Lebanon, V-18 (Lovett). 



582. Cynorhina humeralis (Will.) 

 Corvallis, V (Summers); Hood River, VI (Cole). 



583. Cynorhina scitula (Will.) 

 The most common midsummer species on blossoms in 

 higher altitudes, 3,000 to 6,000 feet, outranking even 

 Sericomyia chalcopyga (Lovett). 



584. Pocota grandis (Will.) 

 Mt. Jefferson, VII and VIII (Bridwell and Lovett). A 

 large, showy creature, occurring in blossoms of yarrow at an 

 altitude of 4,000 to 6,000 feet. Found generally just at the 

 edge of the forest and in small sunny clearings. Its flying 

 period is from 9 to 1 1 A. M., and it is seldom seen later. 

 Considering its size, it is swift in flight, alighting but seldom 

 and then for a brief time. 



585. Criorhina grandis Lovett, new species 

 Length 15 to 17 mm. A conspicuous black and yellow 

 species. Black with elongate black pile, across thorax in 



