246 NEW YORK STATE MUSEUM 



68. Chironomus nigritibia Walker 



1848 Chironomus Walker. list Dipt. Brit. Mus. 1 : 16 

 1878 Chironomus Ost. Sack. Oat'l. Dipt. N. A. p.21 



Wings bare; chest black; abdomen yellow at the base; palpi 

 brown; legs yellow; tips of thighs and of shanks, and of joints of 

 the feet, black; wings colorless; a broad brown band across each 

 wing, faint toward the hind border; veins brown; yellow towards 

 the base; poisers lemon-color. Length of body 2.25 lines (=4.5 

 mm.) ; of wings 4.5 lines (^9 mm.). St Martin's falls, Albany 

 river, Hudson's bay. Walker, loc. cit. 



This specleis may be the same asi O. b r a c h i a 1 i s Ooq. 



69. Chironomus borealis Curtis 



1831 Chironomus Ctirtis. Ross' Voyage. LXXVII 

 1878 Chironomus Ost. Sack. Oat'l. Dipt. N. A. p.20 



'Black, thorax gray, abdomen with 7 whitish rings ; costa fus- 

 cous; legs lurid. Length, 6 mm. Breadth, 12 mm. 



Black, basal joint of the antennae ochreous; thorax hoary; 

 abdomen clothed with long subdepressed yellowish hairs, the mar- 

 gins of the segments shining whitish or silvery; wings lacteous, 

 opalescent, the costa fuscous, the nervures darker; halteres 

 yellow; legs dull castaneous ochre, tips of the thighs and tarsi 

 fuscous. Arctic regions. Curtis, ]oc. cit. Greenland. 



According to Lundbeck (1898) this species may be the same as 

 either C. hyperboreus, or C. staegeri, though Curtis' 

 description is too brief to admit of a positive statement. 



70. Chironomus albistria Walker 



1848 Chironomus Walker. List Dipt. Brit. Mus. 1 : 17 

 1878 Chironomus Ost. Sack. Cat'l. Dipt. N. A. p.20 



Male. Body reddish brow n ; stripes on the chest red or flesh- 

 color; side stripes passing into two broad white stripes; sides of 

 chest hoary; scutcheon pale red; abdomen dark brown, hairy; 

 sutures of the segments paler; feelers pale brown; legs pale 

 taAvny, hairy; tips of thighs, of shanks, of feet, darker; wings 

 whitish, not hairy; veins pale yellow; poisers white. Length of 

 the body 3 lines (=6 mm.) ; of the wings 4.5 lines (=9 mm.). St 

 Martin's falls, Albany river, Hudson's bay. Walker, loc. cit. 



71. Chironomus brunneus Walker 



1848 Chironomus Walker. List Dipt. Brit. Mus. 1 : 21 

 1878 Chironomus Ost Sack. Oat'l. Dipt. N. A. p.20 



Male. Wings hairy. Head and chest brown, the latter with 

 the usual three stripes of a pale gray color; abdomen of a yel- 



