1903] MELANDER : — NORTH AMERICAN SPECIES OF NEMOTELUS \^C 



DESCRIPTIONS OF THE SPECIES. 

 I. Nemotelus crassus Loew. 



Nejnotelus crassus Loew, Cent. Amer. Diptera, iii, 10. (') 



Williston, Can. ent., 1SS5, vol. 17, p. 12S. (2) 

 Johnson, List ins. N. J., p. 639. (3) 



Female. Stout, of a greenish black somewhat metallic color, front not spotted, anten- 

 nae black, the tip of the second joint yellowish, a lateral line of the thorax, the knees, the 

 front tibiae, and all the tarsi pale yellowish. Length of body 2jV lines (4.2 mm.), length of 

 wing 2 lines (4 mm.). 



Rather stout, bare, highly shining, greenish black, the color of the anterior part of the 

 front and of the face merging to bluish rather than green. Front broad, immaculate. 

 Antennae black, the tip of the second joint brownish or yellowish. Face produced into a 

 rather large sharp cone. Lateral line of the thorax ver_y slender, pale yellowish. Femora 

 black, the tip, however, yellowish ; the whole of the front tibiae and the broad base and 

 narrow tip of the hinder ones yellowish, the intervening portion black; tarsi pale yellowish. 

 Halteres white. Wings whitish, the thinner veins similar, the thicker ones very pale yel- 

 lowish, submarginal cell of an opaque color. {Tra?isla/io?i.) 



Rhode Island ^'); Kansas '2*; New Jersey <3). 

 Profile of head of male and female figured on plate. 



2. Nemotelus canadensis Loew. 



Nemotelus cattadensis Loew, Cent., iii, 12. (i) 



Male and female. Clothed with shoil whitish hairs, shining, greenish black, subme- 

 tallic, antennae black, the lateral line of the thorax very narrow, the tip of the femora, the 

 tibiae except a median ring around the hind ones, and the tarsi yellowish. 



Male. Eyes contiguous, frontal triangle yellowish, face drawn out. 



Female. Fi'ont broad, on each side with a yellowish spot, sometimes faintlv marked, 

 face acute. 



Length of bod^- 2-2j'2 lines (4.-4.2 mm.), length of wing 2 lines (4 mm.). 



Clothed with short and fine whitish hair, shining, greenish black, somewhat metallic. 

 Head concolorous. Eyes of male contiguous, eyes of female separated on the broad front. 

 The anterior frontal triangle of the male pale yellow above, the front of the female marked 

 on each side with a pale yellow spot. Face of male produced into a moderately prolonged 

 cone, of the female into a subacute one. Lateral line of the thorax whitish yellow, very 

 fine. Abdomen margined with a dirty yellow narrow line sometimes obsolete. Femora 

 black, yellow at the tip; tibiae yellow, the hind ones annulate with a black ring; tarsi 

 yellow, the last joints frequently infuscated or blackened. Halteres white. Wings whitish, 

 the stronger veins pale yellowish, the submarginal cell often of the same color. {Traiisla- 

 tioti.^ 



