240 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Sei. 



hind margin and scutellum with elongate yellow pile; across middle of 

 dorsum, as a black band, and extending forward to the humeral angle the 

 pile is moderately elongate, black, blending into the yellow by a margin of 

 brown ; post-alar callosities with black bristly pile. 



Abdomen black, subopaque on disc of first three segments; fourth seg- 

 ment and margin of fifth subshining blue-black; pile throughout moder- 

 ately long, brown; legs black, knees and proximal third of tibiae brown; 

 pile black, mixed slightly with yellow on front and middle tibia; wings 

 smoky throughout; veins black. 



Holotype (No. 495), male, in Museum of the California 

 Academy of Sciences, collected at Corvallis, April 22, 1917, by 

 C. Neilson. 



Two specimens from Hoquiam, Wash., May 1, 1904, 

 Burke, collector, observed in National Museum collection. 



27. Chilosia pacifica Lovett, new species 



Eyes bare ; arista moderately plumose ; scutellum and thorax 

 with bristles on margin; pile of dorsum, short, bristle-like, 

 black throughout; third antennal joint sub-quadrate, corners 

 rounded, a little longer than broad, bright reddish yellow ; legs 

 black. Length 7 to 7.5 mm. 



Female: Shining blue-black; front same, punctate, coarsely black pilose; 

 face shining, bare, witih indistinct greyis'h pollen, deeply concave below the 

 antennae ; tubercle rounded, obtuse ; below tubercle almost straight ; cheeks 

 shining black, pollinose at base of eye; first and second joints of antennae 

 brownish black, second yellowish at apex ; third slightly larger than medium, 

 longer than wide, subquadrate, conspicuously reddish yellow, very indis- 

 tinctly pollinose ; arista at base of segment, black, moderately plumose. 



Dorsum of thorax and scutellum blue-black, shining, with short bristle- 

 like pile more abundant forward; margins of thorax and scutellum with 

 black elongate bristles ; pile of pleura black, bristle-like. 



Abdomen shining blue-black throughout, broadly oval, widest at apex of 

 second segment; first, second and third segments practically bare on disc; 

 fourth segment and margin of third with sparse, moderately long whitish 

 pile ; triangular area on anterior margin of second with longer mixed white 

 and black pile. 



iLegs black, the knees briefly brown, wings smoky throughout, veins 

 black, stigma yellow. Posterior cross-vein approximately straight with 

 outward stump at base. 



Holotype (No. 496), female, in Museum of the California 

 Academy of Sciences, from Lava Lake, Ore., July 25, 1915, 

 A. L. Lovett, collector. 



Near cyanea Hunter; varies in pile of thorax which is short, 

 coarse, bristle-like, black, including scutellum. 



Six specimens, all females, three from Mt. Jefferson, Ore., 

 July, 1907, by Bridwell, one from Corvallis, Ore., May, 1917, 



