OF WASHINGTON, VOLUME XII, I'.UO. 125 



only the apices of the femora reddish-yellow. Face separated from the 

 cheeks by a wide notch, arista longer than the antennae proper. Front, 

 mesonotum, and scutellum olive-brown pruinose, mesonotum without ac- 

 rostichal bristles, marked with a dorsal pair of black vitUe, scutellum 

 bare except for the apical pair of bristles; metanotum, pleura, venter, 

 and sides of abdomen olive-gray pruinose, middle of dorsum of abdomen 

 brownish. Femora devoid of long bristles and hairs. Wings grayish 

 hyaline, a brown cloud on vein at base of second submarginal cell and 

 another at apex of discal cell; only two submarginal cells, anal cell much 

 shorter than the second basal, the sixth vein prolonged far beyond the 

 apex of the anal cell. 



Length, nearly 3 mm. 



Banff, Canada. A single specimen collected by Mr. N. B. 

 Sanson. 



Type: No. 13090, U. S. National Museum. 



Family DOLICHOPODID^. 



Tachytrechus junctus, new species. 



Male. Arista simple, tip of fourth vein near that of the third and far 

 from the extreme apex of the wing! Antenna? yellowish, the third joint 

 subelliptical, blackened at its apex, arista black, bare; face descending 

 to lower end of the eyes, whitish pruinose, tinged in places with yellow; 

 upper occipital bristles black, the others whitish. Body violaceous arrd 

 green, the humeri, notopleura, pleura, and sides of abdomen whitish pru- 

 inose, scutellum two-bristled, last segment of the hypopygium polished 

 black, the lamellae black, subcordate. wider than long. Halteres and 

 calypteres yellow, bristles of the latter black. Legs black, outer side of 

 front tibiae on the lower three-fourths whitish, knees of front and middle 

 legs, middle and hind tibiae except at apex, and first joint of front and mid- 

 dle tarsi except apically, yellowish; front tibiae noticeably thickened, 

 first joint of their tarsi as long as the remaining joints together, third joint 

 of middle tarsi narrowed and bent on the basal portion, first two joints 

 of hind tarsi subequal in length, legs devoid of long hairs. Wings hya- 

 line, hind margin even, costa not thickened. 



Length, 5 mm. 



Manahawkin, New Jersey. A male specimen collected 

 September 5, 1909, by Mr. H. S. Harbeck. 

 Tvpe: No. 13091, U. S. National Museum. 



Family SYRPHID^. 



Sphegina petiolata, new species. 



Male. Near lobata, but with a much more slender abdomen, tricolor- 

 ous hind femora, etc. Head black, face and cheeks pale yellow, anten- 



