86 Journal New York Entomological Society. [Voi. xx. 



Legs wholly opaque gray pruinose, tarsi with brush-like pale hairs below, 

 front metatarsus of male somewhat thickened, and with curled hairs on outer 

 side, making the middle of the joint appear wider than it is; hind femur with 

 a wide shining black area on the inner side, beginning near the base and ex- 

 tending beyond the middle ; hind tibae with a very narrow shining black line 

 on the hind edge at the tip, extending up the tibia only one sixth its length. 

 Claws very long and straight, no pulvilli. 



Wings as in halftone, veins black, brownish-yellow at base; costa with 

 a few short spinules beyond middle. 



Length, 3.2 to 5.6 mm. ; of wing, 3.5 to 4.5 mm. 



Distribution. 



Washington: Soap Lake (C. V. Piper, in State College coll.). 

 Lake Como (U. S. National Mtiseum, reported by D. W. Coquillett). 



Oregon: Albert Lake (U. S. N. M.). 



California: Borax Pond near Clear Lake. Clear Lake (Packard 

 ■ — probably was actually the same as the preceding, as Clear Lake is 

 fresh water). Mono Lake (several collectors). Owen's Lake and 

 Valley (several). Borax Lake and East Lake ( U. S. N. M., with- 

 out further information as to where these are). 



Nevada: Soda Lakes (Williston). Lagoon south of Pyramid 

 Lake (U. S. N. M.). Pyramid Lake. 



Utah: Great Salt Lake (U. S. N. M.). 



Wyoming: 12 miles north of Lusk (U. of Kansas coll.; no data as 

 to body of water). 



Nebraska: Salt Marshes near Lincoln (L. Bruner). 



Minnesota: Red River Valley (Washburn; no data as to body of 

 water). 



Mexico: Guanajuato and Lake Texcuco (U. S. N. M.). Without 

 locality (Say and Loew). 



Pupa (PI. IX, Fig. 15). — Specimens of these were extracted from the 

 puparia and photographed. As in gracilis, they seem to present no char- 

 acters of importance in classification or biology. 



Ptiparitim (PI. IX, Fig. 16). — Length 7 mm.; of tube to fork, 2.6 mm.; 

 of fork, I.I mm. Spindle-shaped, strongly tapering and up-curved in front, 

 more gradually tapering and straight posteriorly; first four pairs of prolegs 

 small but provided with strong hooks; last four pairs large and protuberant, 

 the last pair largest and longest, and the hooks reversed in position; on the 

 posterior side of this segment are some small protuberances which in some 

 cases appear like additional but rudimentary prolegs, but they vary in develop- 

 ment in different specimens ; there are some bulging spots on the shell on 



