OF WASHINGTON. VOLUME XIV, 1912. 127 



pollinose; scutellum bearing a short apical pair of macro- 

 chaetse besides the long marginals; abdomen grayish polli- 

 nose; first segment bearing a pair of marginal macrochaetse; 

 the others bearing both marginal and discal macrochaetse. 

 1 male and 1 female specimen bred from chrysalids of 

 Retinia sp. Type, 3532, U. S. National Museum. (Revis. 



Tachin., p. 54.) retina Coq. 



Middle tibiae each bearing two macrochaetse on the front side 

 near the middle; front in both sexes about two-thirds 

 as wide as either eye; cheeks one-half as broad as the eye 

 height; facial ridges at most bearing one or two bristles 

 above the vibrissae; parafontals shining black, thinly 

 dusted gray pollinose near the base of the antennae; the 

 third antennal joint in both sexes at least four times as 

 long as the second; first two joints of the antennas and 

 the tip of the proboscis yellow; arista somewhat pubes- 

 cent on the basal half, thickened on the basal fourth, 

 penultimate joint longer than broad; orbital bristles pres- 

 ent in both sexes; thorax gray pollinose; scutellum bear- 

 ing three pairs of long marginal macrochaetse; abdomen 

 with grayish white pruinose bands on the basal margins 

 of segments two and three; sometimes carinate on the 

 venter; usually no discal macrochaetse present; (2 females 

 have a weak pair of discals on segments 2 and 3) ; wings 

 slightly smoky tinged costally; third vein bearing two to 

 four bristles at its base; apical cell closed or open in the 

 margin of the wing. Length, 5 to 7 rnm. 1 male and 5 

 females from Oswego, New York. Type, 4064, U. S. 

 National Museum. (Can. Ent., vol. XXX, p. 234) . . Polita Coq. 



