FUNGUS GNATS OP NORTH AMERICA. 273 



In another specimen from Massachusetts the face, basal 

 portion of each abdominal tergite and thoracic stripes are dark 

 brown but otherwise does not differ. It is possible that the 

 Ithaca specimen is teneral. 



Female. Similar to the Massachusetts specimen in coloring. 



Var. a. Female. Similar to the foregoing but abdomen is 

 wholly black. Mt. Greylock, Mass., June. (C.W.J.) Oviposi- 

 tor is shown in Fig. 161. 



Var. b. Female. Similar to Var. a. but the subcostal vein is 

 produced a little distad of the base of Rs. Friday Harbor, 

 Wash. (J.M.A.) 



10. Boletina grcenlandica Stseger. 

 Naturh. Tidsskr. I. 356. 1845. 



Male and female. Length 5 mm. Head and palpi blackish; 

 antennae of the male over twice as long as the thorax, imme- 

 diate base of joint 3 reddish, remaining joints fuscous. Thorax 

 and abdomen blackish, abdomen of the female with posterior 

 margins of segments 2-6 yellow. Halteres pale. Legs yellow, 

 posterior coxae, and all. trochanters and tarsi blackish ; tibiae 

 testaceous, spurs yellow ; posterior femora blackish at apex. 

 "Greenland." 



11. Boletina beringensis Coquillett. 

 Diptera of Commander Isl. 342. 1898. 



Female. Length 4.5 mm. Head black, opaque gray pruinose, 

 antennae blackish brown, the second joint yellow, proboscis 

 blackish brown ; palpi yellow ; thorax, scutellum and abdomen 

 black, the hairs yellow, mesonotum marked with 3 black vittae, 

 posterior margins of the abdominal segments 2 to 6 and the 

 genitalia yellow. Coxae, femora and tibiae yellow, the trochan- 

 ters black; tarsi except the base, brownish black. Wings 

 hyaline, the costal cell yellowish, veins yellow, the basal third 

 of M2 colorless ; tip of Sci slightly before base of Rs, Sc- a 

 .short distance before the middle of Sci; M and Cu forking 

 slightly before the base of Rs, the forking of M more proximal 

 than that of Cu ; anal vein extending a short distance beyond 

 the forking of Cu. Halteres yellow. "Bering Isl." July-Aug. 



