124 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



3. Palpi yellow 5 



Palpi black; three sternopleural macrochaetse; bristly hairs 



or macrochaetse on sides of face not arranged in a single row 4 



4. Front in the male one and one-third times as wide as, in the 



female one and three-fourths to two times as wide as either 

 eye; parafacials yellowish-gray pollinose; sides of face each 

 one-third as wide as the median depression; usually three 

 pairs of frontal bristles descending below base of the 

 antennae; the third antennal joint six to seven times as 

 long as the second; arista thickened on basal three-fifths, 

 penultimate joint at least twice as long as broad; facial 

 ridges bristly on lowest two-thirds; thorax thinly dusted 

 gray pollinose; scutellum bearing three pairs of long margi- 

 nal macrochaetse and a short apical pair; middle tibise 

 each bearing a single macrochaeta on the front side near 

 the middle; abdomen with thinly dusted grayish-white 

 pruinose bands on the basal margins of the last three seg- 

 ments; first segment bearing a pair of marginal macro- 

 chaetse; the others bearing both discal and marginal 

 macrochaetse; wings hyaline; third vein bearing two to 

 four bristles at its base. Length, 5 to S mm. 4 females 

 from Washington, D. C., and Beverly, Massachusetts. 

 (Joun. N. Y. Ent, Soc., vol. ill, p. 58; June, 1895.) . pergandei Coq. 

 Front in the male four-fifths as wide as either eye; parafacials 

 grayish-white pollinose; paraf rentals shining black; cheeks 

 nearly one-third as broad as the eye-height; third antennal 

 joint three and one-half times as long as the second; arista 

 slightly pubescent at the base, thickened on the basal 

 two-fifths; penultimate joint longer than broad; thorax 

 grayish-white pollinose; scutellum bearing three pairs of 

 long marginal macrochaetse; the middle tibise each bearing 

 two macrochaeta? on the front side near the middle; the 

 first abdominal segment black; the remaining segments 

 with grayish-white pruinose bands on the basal margins; 

 abdomen bearing both discal and marginal macrochaetse; 

 wings smoky tinged except along the hind margins; third 

 vein bearing from one to three bristles at its base; apical 

 cell closed in the margin of the wing, sometimes short 

 petiolate. Length, 5 to 7 mm. G males from Moscow and 

 Juliaetta, Idaho. Type: 6202 U. S. National Museum. 

 (Proc. U. S. N. M.,xxv, p. 105.) limata Coq. 



5. With three sternopleural macrochaetse 9 



With two sternopleural macrochaetse, middle tibise each bearing 



a single macrochaeta on the front side near the middle; 

 scutellum bearing a weak apical pair of macrochaetse; 

 abdominal segments except the first gray pruinose on the 

 basal margins 6 





