124 THE CANADIAN KNTOMOLOGIST. 



3. Chrysogaster pictipennis, Loew, Centuries, iv., 58. 



Numerous specimens of this species were taken by the writer at Cedar 

 Bluffs, in Nebraska. The species has been recorded hitherto only as far 

 west as New York. All of these specimens seem to differ from Eastern 

 ones only in the fact that the wings are less distinctly marked. 



TABLE OK THE SPECIES OF CHILOSIA INCLUDED BELOW. 



1 . Eyes bare 2 



Eyes pilose 3 



2. Anterior cross vein distinctly bent at base, and parallel to vein at 



base of the discal cell ; thorax long pilose ; opaque black species ; 



wings very dark plutonia, n. sp. 



Anterior cross vein perfectly straight, not parallel to vein at base of 

 discal cell ; thorax very short pilose ; shining olivaceous species ; 

 wings hyaline gracilis, n. sp. 



3. Scutellum with bristles or bristle-like hairs on the margin 4 



Scutellum without bristles on the margin ; tibiae largely reddish ; 



wings tinged with yellowish ; white ]:)ilose, bluish 



species puncttdata, n. sp., 



4. Face hairy ; thorax white pilose ; anterior cross vein oblique ; robust, 



shining brassy species pacifica, n. sp. 



Face not pilose ; thorax black pilose ; anterior cross vein rectangular, 

 deep blue, shining species alaskensiz n. sp. 



4. Chilosia alaskensis, n. sp. Plate V., Fig. 4. 



Everywhere deep blue, shining, very short pilose. Eyes pilose, 

 arista scarcely pubescent, incrassate on the basal half, scutellum with 

 bristle-like hairs. 



Female. — Eyes very short sparse pilose, appearing white from above. 

 Front shining blue, sparsely punctured short black jjilose, with a large sul- 

 cate swollen area above the antenme. Face very prominent, deeply con- 

 cave below the antennae to the rounded, very prominent tubercle situated 

 a trifle below the middle of the eyes, thence shortly but not very deeply 

 concave to the epistomal tubercle which is only slightly less i)rominent 

 than the U])per, and is situated considerably above the lower eye margin. 

 Below the lower tubercle straight, slightly receding. Cheeks narrow, 

 lower border straight, epistoma not truncated at tip. Antennas and 

 margin of the antcnnal orifice reddish-yellow, first and second joints 

 and the narrow upper margin of the third brownish. Third joint 

 very large, circular with the upper outer margin slightly less convex. 



