246 NEW YORK STATE MUSEUM 



68. Chironomus nigritibia Walker 



1848 Chirononius Walker. List Dipt. Brit. Mus. 1 : 16 

 1878 Chironoruns Ost. Sack. Cat'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 species may be the same as C. b r a c h i a 1 i s Ooq. 



69. Chironomus borealis Curtis 



1831 ChiTonomus Curtis. Ross' Voyage. LXXVII 

 1878 Chironomus Ost. Sack. Cat'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, loc. cit. Greenland. 



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

 either C. hyperboreus, or C. s t a e g e r i , 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 brown ; 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 

 tawny, 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 C h i r o n o m n s Ost. Sack. Cat'l. Dipt. N. A. p.20 



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

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



