TWO WESTERN SPECIES OF EPHYDRA. 



By J. M. Aldrich, 

 Moscow, Idaho. 



As a completion of the preceding article I append the description 

 of a new species of Ephydra that I know only in the adult stage, 

 which was collected while investigating the shores of Great Salt Lake 

 last summer, together with a redescription of E. viridis Hine. Both 

 species are strongly marked and easily recognizable. There is also 

 added a table for the separation of the western species. The only 

 name occurring in it besides these two new species and the four men- 

 tioned and described in the preceding paper is atrovircns Lw., which 

 I have collected in the vicinity of Moscow, Idaho. 



Ephydra auripes new species. 



Male. — Opaque green, the front except orbits and ocellar triangle, and 

 the posterior half of the mesonotum with the scutellum, intensely shining blue- 

 green or bronze-green ; legs dark green, all the tarsi wholly golden yellow. 



Ocellar triangle and wide frontal orbits velvet-black, rest of front in- 

 tensely shining blue-green, three fronto-orbital bristles curving over the eye, 

 besides the outer vertical bristle which does the same ; antennae small, black, 

 second joint robust, third small, arista with only slight and faint plumosity, 

 prominence of face very high, long and vertical in front, with a nearly bare 

 spot above the prominence and just below the antennae, which is sub-shin- 

 ing blue, the rest of the face whitish pollinose, hairy, with small bristles along 

 the mouth and a slight row of bristly hairs across the upper part. Proboscis 

 and palpi blackish-green. 



Thorax semi-opaque greenish, changing to brilliant bronze-green behind; 

 at the sides the change comes suddenly at the suture, on the disk gradually 

 and farther back; scutellum also brilliant bronze-green. Chaetotaxy of 

 thorax normal, the bristles well developed. Pleurae opaque, one rather strong 

 bristle in the row of bristly hairs on the hind edge of the mesopleura ; one 

 sternopleural ; knob of halteres bright yellow. 



