326 A. L. MELANDER. 



Enipis dolabraria subsp. nov. disconveuita. 



An incipient species which will have to be connected with the 

 foregoing for the present. 



The differences lie in the wing-neuration ; the furcation of the 

 third vein takes place opposite the end of the marginal cell, the 

 posterior branch of the fork terminates beyond the extreme wing- 

 tip ; the discal cell is larger, the first section of its front border is 

 less than one-fifth the length of the second section, while the hind 

 border is as long as the continuation of that vein. The occipital 

 bristles are much stouter in this form. 



One male and one female ; California. 



Empis falcata sp. nov. (Fig. 137). 

 Male and Female. Length 7.5 mm. or less. — A very slender species, with sparse 

 bristles. Face and front narrow; palpi pale, with two minute preapical hairs: 

 labella less than two-thirds as long as the proboscis ; antennae slender, compara- 

 tively long, the first joint fully two times as long as the second, the third joint 

 narrow at the base and gradually attenuated, rather blunt at the tip, the style' 

 less than one-fourth the length of the third joint. Scutellum with two small 

 widely separated marginal bristles, and a minute outer pair on each side of these ; 

 no pectal bristles; pronotal collar minute but distinct ; in front of the halteres 

 are three small bristles. Hypopygium projecting above the abdomen, compara- 

 tively large, the central filament not suddenly enlarged, plainly visible at the 

 base, the middle lamellse large. Legs slender, wholly yellowish, except the usual 

 spots on the trochanters and the knees, their bristles strong, especially on the 

 hind tibise and the tarsi, but nowhere lengthened ; tarsi long and slender, espe- 

 cially the front and middle pairs; hind femora not reaching the hypopygium, 

 with a subapical lateral tubercle on the posterior side, in front of which on the 

 under side is a transverse bifurcate process, the inner (posterior) portion of which 

 is slender, strongly curved and pointed, the outer is short and stout and tipped 

 with a pencil of black scale-like bristles; hind tihije somewhat curved, slender 

 at the knee, articulating with the lateral femoral process is an emarginate, almost 

 medially placed process, the posterior portion of which is tipped with a small 

 curved brush of black hairs, diagonally in front of this, but still on the lower 

 side of the tibiie, is a broad, flat protuberance, black apically and fringed on the 

 outer edge with long stout black bristles. The third longitudinal vein furcate 

 at the tip of the marginal cell, the posterior branch ending lieyond the extreme 

 wing tip, the first section of the anterior border of the discal cell less than one- 

 third the length of the second section, the hind border shorter than the coutinu- 

 ation of that vein. 



One male from Berkely, California, March 26, 1897 ; collected by 

 Dr. Wm. M. Wheeler. A male and a female, Juliaetta, Idaho ; 

 collected by Prof. J. M. Aldrich. 



EiU|>is canaster sp. nov. (Figs. 139, 140). 

 Male and Female. Length 7 mm. — A slender gray species. Palpi infuscated at 



