1/8 MAINE AGRICULTURAL EXPERIMENT STATION. I9IO, 



viated posteriorly; metanotum yellowish brown; four scutellar 

 bristles and setag of the thorax black, finer hairs pale. Abdo- 

 men yellow, each tergite with dark brown posterior margin 

 which is more or less produced forward in a dorsal line; sixth 

 and seventh segments wholly dark ; hairs pale. Hypopygium 

 (figs. 132, 136) yellow, resembling that of pulchella Dzied., dor- 

 sally with a pair of doubly curved horn-like processes articu- 

 lated at the base. Legs slender, yellow, fore metatarsus about 

 lyi times as long as the tibia ; spur of middle coxae sickle shaped, 

 short, about yi as long as the fore metatarsus ; setae of hind tibia 

 not twice as long as the diameter of the member. Wings hya- 

 line, yellow tinged ; subcosta ends in the costa beyond the middle 

 of the cell R^, which is over twice as long as wide, the subcostal 

 crossvein is near the middle of this cell ; R4+5 ends at the tip of 

 the wing; petiole of the media is about half as long as M2 ; 

 cubitus forks under or slightly proximad of the R-M crossvein. 

 Length of wing is 4 mm., which is twice the length of the fore 

 m.etatarsus. Halteres yellow. 



Female. Like the male but the subcostal crossvein is distad 

 of the middle of the cell R^ and the coxal spurs are wanting. 

 Ir immature specimens the brown markings of head, thorax 

 and abdomen are less extended. Ithaca, N. Y. ; Mass. and 

 Wis. (Wheeler, col.) ; Selkirk Mts., B. C. (Bradley, col.) ; 

 Kingston, R. L (Barlow, col.). July and August 



13. My corny a biseriata Loew. 

 1869. biseriata^ Loew, Berl. Ent. Zeitschr. XIIL 140. (Scio- 



phila). 

 Male. Length 5.7 mm. Yellowish; vertex dusky. Thorax 

 yellowish ; dorsum with black pile ; pleura with subfuscous spots. 

 Abdomen with black pile ; each segment excepting the first with 

 a triangular fuscous black spot on each side which extends from 

 the anterior nearly to the posterior margin. Legs pale yellow, 

 tarsi more dusky. Wings uniformly tinged with cinereous yel- 

 low, veins dusky yellow ; subcostal vein ends in the costa (in 

 the left wing its apex is subobsolete in the type specimen) ; cell 

 R^ is large, the subcostal crossvein is placed at the middle of 

 this cell; petiole of the media is shorter than the cell M^ but 

 nearly twice as long as cell R-^, cubitus forks under the base of 

 the R-M crossvein. Recorded from the Red River, Canada. 



