72 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.63. 



than the face, the third joint in both sexes four times the length of 

 second, arista thickened on the basal fifth, the penultimate joint 

 short. Thorax gray pollinose, marked with four black vittae and 

 bearing three dorsocentral macrochaetae ; scutellum grayish with three 

 or four pairs of long marginal bristles. Sternopleura with three 

 bristles. Abdomen black, grayish pollinose, the abdominal hairs 

 long and erect and readily confused with the macrochaetae. Legs 

 black, mid tibiae with two bristles on the outer front side near the 

 middle; hind tibiae ciliate with one or two longer bristles. Wings 

 hyaline, apical cell open, the third vein with two or three bristles 

 at base. 



Length 10 to 11 mm. 



Described from one male and two female specimens collected by 

 Frederick Knab, May 1907, at Oxbow, Saskatchewan. 



Ti/pe.— Cat No. 25717, U.S.N.M. 



PHOROCERA SILVATICA. new species. 



Front of male 0.23 and in the female 0.35 the head width, silvery 

 l)ollinose; little if any blackish pollen at vertex (in female the sides 

 of front are silvery pollinose with a yellowish tinge, and are clothed 

 with many long fine hairs outside the frontal row) ; parafacials sil- 

 very pollinose; in the male at narrowest part about one-third the 

 width of the median depression; bucca one-third the eye height; 

 palpi yellow; antennae five-sixths the length of face, black, the 

 third joint largely reddish, in the male four times the second, arista 

 tapering gradually to apex, penultimate joint short. Thorax grayish 

 marked with four black vittae and bearing three dorsocentral macro- 

 chaetae; scutellum black, only the tip yellowish, with four pairs of 

 marginal and one pair of discal bristles. Sternopleura with three 

 bristles. Abdomen thick, black, sprinkled with grayish pollen, the 

 abdominal hairs sub-erect at most and distinct from the macro- 

 chaetae; first segment with one pair of marginals, intermediate seg- 

 ments with two or three pairs of discals besides the marginals, and 

 the fourth wholly covered with macrochaetae. Legs black; mid 

 tibiae with two bristles on the outer front side near the middle; hind 

 tibiae subciliate at most ; front pulvilli less than twice the length of 

 the hind ones. Wings hyaline, apical cell open the length of the 

 small cross vein, costal spine small but distinct, third vein at base 

 bearing two or three bristles. Hypopygium blackish, the inner for- 

 ceps slightly swollen at base and about three-fourths the length of 

 the outer ones, clothed on the outer side with fine short hairs. The 

 fifth sternite is noticeably lobe like. 



Length 10 mm. 



Described from a male and female specimen taken at Cranbrook, 

 British Columbia, May 11-12, 1919, by C. Garrett. The species is 

 closely related to fitscimacuJa. but differs mainly as follows: width 



