172 THE CANADIAN ENTOMOLOGIST 



distinct yellow subterminal ring. Hypopygium darker coloured. The most 

 striking differences between this and the related regional species are found in 

 the male hypopygium, as follows: 



Ninth tergite dark coloured, with a deep, impressed mid-dorsal line; posterior 

 margin with a wide V-shaped notch, the lateral lobes formed terminating in 

 blackened chitinized points, the lateral notches only slightly concave, larger and 

 not so deeply rounded as in T. jragilis. Outer pleural appendage long, slightly 

 flattened, not as stout as usual in the group, pale, almost white in colour, the 

 basal third slightly contracted and produced proximad into a blunt, blackened 

 lobe. Inner pleural appendage a pale, almost white, compressed blade, on the 

 posterior margin near the base bearing a small knob provided with numerous 

 short, black setae. At the ventral angle of the pleurite, jutting dorsad across 

 the face of the genital chamber as a long, slender, slightly sinuous lobe tapering 

 to a point, densely covered with white hairs; this structure is considerably 

 larger than the corresponding one in T. Jragilis. Ninth sternite with a deep 

 notch which is slightly enlarged at its base, the sides parallel or nearly so. Eighth 

 sternite compressed, with a very deep median notch, the adjacent lobes con- 

 tiguous apically, though separated basally, provided with long, yellow hairs. 

 In T.fragilis, the eighth sternite is spade-shaped, unnotched. 



Habitat.— hlsLsks.. (Iditarod River Country). 



Holotype.— d', Flat, September 6, 1917, (A. N. Twitchell). 



Allotype.— 9 , Bethel, September 24, 1917, (A. N. Twitchell). 



Type in the United States Biological Survey collection. 



Nephrotoma euceroides, new species. 



Generally similar to N. eucera (Lw.) from which it differs as follows: Average 

 size much smaller (male, length 14-14.2 mm.; wing 13.8-15 mm.). Male 

 antennae with only 17 evident segments. Thoracic stripes distinct, reddish 

 brown, much darker than in N. eucera. Wings with a more greyish yellow 

 tinge, the stigma poorly defined, pale. Abdomen darker, brownish yellow, the 

 hypopygium brown. Male hypopygium with the ninth tergite having the 

 caudal margin evenly rounded with a small, narrow median notch whose nearly 

 contiguous lateral angles are produced beneath into blackened lobes which are 

 densely spiculose. Eighth sternite with a broad, deep posterior notch, the 

 median area of the sternite not so densely hairy as in N. eucera. 



Habitat. — Northeastern North America. 



Holotype. — cf, Sport Island, Fulton Co., New York, altitude 750 feet. 

 June 16, 1910, (C. P. Alexander). 



Paratype.— &, Perth, New Brunswick, June 15, 1915, (F. M. McKenzie). 



In general appearance, N. euceroides is very similar to TV. breviorcornis 

 (Doane) from which it is most easily told by the number and structure of the 

 antennal segments. 



Mailed July Sth, 1919 



