310 A. L. MELANDER. 



pie, reddish yellow ; coxse grayish basally, with whitish hairs on the antero-ex- 

 terior side, trochanters with a faint blackish spot below near the tip; femora a 

 little thickened ; metatarsi about equal in thickness, slender, front and hind ones 

 of the same length, middle ones a little shorter; last tarsal joint blackish ; legs 

 clothed with very fine, dense, short, pale pubescence and with short blackish 

 hairs, longer on the under edge of the femora. Halteres large, yellowish. 

 Wings large, full, dark, no stigma present, anterior branch of the third vein 

 curved, oblique, no large costal bristle. 



Two males; Moscow, Idaho, and Mt. Hood, Oregon. 



This species differs structurally from E. ravida Coquillett in the 

 larger hypopygium, thickened femora, slender tibise and tarsi, sepa- 

 ration of the eyes, and the chsetotaxy, especially of the scutellum, 

 hind femora and coxae. 



Empis ravida Coquillett (Fig. 111). 

 Proc. Nat. Mus., 1895, p. 403. 



3Iale. — Black, the palpi and halteres yellow, the proboscis, except the lower lip, 

 hypopygium, coxae (largely or wholly), femora, tibiae and tarsi, reddish yellow. 

 Eyes contiguous, frontal triangle bare. First antennal joint two and one-half 

 times as long as the second, the third joint one and a half times as long as the 

 first, sublanceolate, the style rather slender, nearly half as long as the third 

 joint. Proboscis twice as long as the height of the head. Thorax opaque, gray 

 poUinose, marked with four brownish black vittse, the shorter pile whitish, the 

 longer pile and the bristles black. Pile on each end of the pleura, on coxae, ven- 

 ter and sides of abdomen whitish ; middle and hind coxae bearing black bristles. 

 Scutellum bearing six to eight black bristles. Abdomen opaque, white pollinose, 

 the short pile of the dorsum black. Hypopygium moderately large, obliquely 

 ascending, the central filament not disengaged ; no projections on venter in front 

 of the hypopygium ; coxae and legs simple, femora destitute of stout spines below, 

 the bristles very short; wings dark gray, stigma much elongated, dark brown, 

 anterior branch of the third vein oblique and curved. 



Female. — Same as the male with these exceptions: eyes widely separated ; ab- 

 dominal segments beyond the fifth shining; apical half of the under side of the 

 hind femora ciliate with rather short scales and spines. 6-8 mm. 



New Hampshire (Coquillett) ; Georgia, Idaho. 



Empis captus Coquillett. 

 Proc. Nat. Mus., 1895, p. 405. 



31ale. — Differs from the male of Empis ravida only as follows: first two anten- 

 nal joints reddish ; first joint only slightly longer than the second, the third 

 three times as long as the first, tapering very gradually to the apex ; scutellum 

 bearing only two bristles; dorsum of abdomen brownish pollinose. Hypopygium 

 very large, the filament robust, disengaged, arcuate, compressed and dilated near 

 the apex ; on base of upper side of each upper lamella is a low wart-like process, 

 and just outside of this is a backwardly projecting fleshy process bearing on the 

 middle of its under side a backwardly directed black spine whose tip is even with 



