October, '11] P'ELT: NEW GALL MIDGES 479 



dark brown, the segments margined posteriorly with yellowish setae; membrane 

 and pluraj yellowish orange; venter orange yellowish; genitalia fuscous yellowish. 

 Wings hyahne, costa dark brown. Halteres yellowish orange. Coxa; fuscous 

 yellowish; femora and tibia; mostly cinereous, slightly fuscous apically; tarsi mostly 

 dark brown; claws long, slender, strongly curved, the pulvilli as long as the claws. 

 Genitalia; basal clasp segment stout, truncate; terminal clasp segment rather long, 

 stout; dorsal plate broad, deeply and triangularly emarginate, the lobes narrowly 

 rounded and sparsely clothed with long seta; apically; ventral plate long, deeply 

 and broadly emarginate, the lobes tapering to a narrowly rounded, sparsely setose 

 apex. Harpes broad, stout, irregular apically; style short, stout. 



Female. — Length 1.5 mm. Antenna; fuscous yellowish; sixteen subsessile seg- 

 ments, the fifth with a length three-fourths greater than its diameter; terminal 

 segment produced, narrowly rounded apically. Palpi; first segment short, stout, 

 irregular, second subquadrate, with a length three tines its width, the third one-half 

 longer, slender, the fourth one half longer than the third. Mesonotum shining dark 

 brown, the submedian lines thickly haired. Scutellum dark reddish brown, post- 

 scutellum dark orange. Abdomen dark brown, the segments sparsely setose poste- 

 riorly; membrane, plurae and venter dark reddish; ovipositor pale orange. Wings 

 hyaline, costa dark brown. Halteres yellowish basally, reddish orange apically. 

 Coxae fuscous orange; femora and tibia; yellowish straw; tarsi sUghtly darker, 

 especially the distal segments. Ovipositor as long as the abdomen, the terminal 

 lobes narrow oval sub-acute apically. 



Reared from jar containing maple leaves bearing reddish tinted 

 pouch, vein galls 3^ inch long. Type C. all33. 



Dasyneura gibsoni n. sp. Male. — Length 1.5 mm. Antenna; dark brown; fifteen 

 segments, the fifth with a stem one fourth longer than the cylindrical basal enlarge- 

 ment, which latter has a length one fourth greater than its diameter; terminal 

 segment reduced, narrowly oval. Palpi; first segment short, subquadrate, the 

 second with a length nearly three times its width, narrowly rounded, the third 

 one half longer than the second, slender, the fourth nearly as long as the third, 

 somewhat dilated. Mesonotum dark brown. Scutellum reddish brown, post- 

 scutellum yellowish brown. Abdomen dark brown. Genitaha fuscous. Wings 

 hyaline, costa dark brown, the third vein nearly straight. Halteres yellowish 

 transparent. Coxa; and femora mostly fuscous yellowish, the tibia; and tarsi dark 

 brown. Claws slender, strongly curved, unidentate, the pulvilli nearly as long as 

 the claws. Genitalia; basal clasp segment rather long, stout; terminal clasp seg- 

 ment stout, tapering; dorsal plate deeply and triangularly incised, the lobes narrowly 

 rounded; ventral plate triangularly emarginate, the lobes stout, tapering. Harpes 

 long, tapering, tuberculate. Style short, narrowly rounded. 



Female. — Length 1.75 mm. Antenna; fuscous yellowish; fifteen subsessile seg- 

 ments, the fifth with a length one half greater than its diameter; terminal segment 

 somewhat reduced, and partly fused with the preceding. Scutellum and post- 

 scutellum fuscous yellowish. Abdomen dark brown. The fuscous yellowish 

 ovipositor, about as long as the body, terminal lobes rather broad, with a length 

 about twice the diameter, narrowly rounded apically. Halteres, coxa; and base of 

 femora pale yellowish, the distal portion of femora, tibia; and tarsi fuscous yellowish. 

 Other characters nearly as in the male. 



Reared from flower heads of Canada thistle, Cirsium arvense 

 collected by Arthur Gibson in the vicinity of Ottawa, Canada. Allied 

 to D. salicifolia Felt. Type C. a2221. 



