146 JAMES S. HINE Vol. XXII, No. 5 



segments and anterior outer comers of fifth segment also yellow. 

 Length 8-9 millimeters. 



Female: Front black on upper two-thirds, otherwise yellow with the 

 exception of a narrow crescent shaped mark above each antenna which 

 is dark brown, entirely black pilose. Yellow abdominal spots concave 

 anteriorly and convex posteriorly making them somewhat kidney 

 shaped with the outer anterior corner somewhat produced and pointed ; 

 the spots on the second segment are smaller and more transverse than 

 the others with the inner ends evenly rounded; legs largely yellow, 

 black to the basal fourth or fifth of the front and middle femora and to 

 a greater extent on the hind femora. Hind tibias with dark areas and 

 all the tarsi dark in part. 



Male: Vertical triangle black, frontal triangle yellow with black 

 pile. Abdominal spots similar to those of the female, but those on the 

 third and fourth segments quite distinctly larger; legs colored similarly 

 to those of the other sex but black of the femora more extensive, 

 including nearl}^ half of middle and front pairs and two-thirds or more 

 of hind pair. 



Female type, Savanoski, Naknek Lake, Alaska, August, 

 1919. Allotype with the same data. Parotypes, six males 

 and one female from Savanoski, Naknek Lake, Alaska, 1919, 

 and ten females from Katmai, Alaska, 1917. Type in the Ohio 

 State University Collection. 



The coloration of the legs is somewhat variable in the 

 species, being darker in general in some specimens, and the black 

 of the femora is more extensive in some specimens than others, 

 especially is this true of the females. The extent of the black 

 on the lower part of the front of the female varies somewhat 

 and the dark crescent-shaped marking above the base of each 

 antenna is more pronounced in some specimens than in others. 



Syrphiis limatus n. sp. 



Male and female shining blue black, face with a wide, shining black 

 stripe, wider than the yellow on either side of it, pointed above and 

 reaching nearly to the base of the antennas; cheeks shining black, eyes 

 rather sparsely hairy, antennas black, abdomen with three pairs of 

 narrow spots, first pair small and located near the middle of the second 

 abdominal segment and entirely separated from the margins, second 

 pair near the anterior margin of the third segment very slightly oblique 

 and extending toward the middorsal line but not quite reaching it, inner 

 third of the spot somewhat widened and nearly touching the anterior 

 margin, outer end reaching over the lateral margin in full width; third 

 pair of spots similar to the second, but narrower, located near the 

 anterior margin of the fourth segment; narrow posterior margins of 

 fourth and fifth segments and anterior lateral comers of the fourth 

 segment also yellow. Length 10-11 mm. 



