467 



distinct, though linear above, extending nearly to upper margin of 

 mesonotum. Hypopygium as in Figure lo, Plate XXXIV. Fore 

 tarsi without long hairs; basal joint more than half as long again as 

 fore tibiae (80: 50) ; mid and hind legs with very long hairs. Third 

 vein ends as far in front of apex of wing as fourth does behind same; 

 cubitus forking slightly beyond cross vein ; first and third veins very 

 hairy. 



Female. — Differs from the male in being darker, in having the 

 antennas yellow, the abdomen with narrow pale margins to all the seg- 

 ments, and in having the halteres yellowish brown. 



The mid and hind legs have the hairs much shorter than those of 

 the male. 



Length, 4.5-5 mm. 



Type locality, Havana, 111., June 15, 1914. Taken by the writer 

 upon laboratory of the Biological Station. Paratypes from Berrien 

 Springs, Mich., July 16, 1914 (C. A. Hart), and Plummer's Island, 

 Md., July-August, 1912 (W. L. McAtee) — the latter in collection of 

 the U. S. Bureau of Biological Survey, Washington, D. C. 



44. Chironomus hai^teraus Coquillett 



Chironomus halteralis Coquillett, Ent. News, Vol. 12, 1901, p. 17. 



Male. — Shining blackish brown or black. Head, including an- 

 tennae and their plumes, fuscous. Ground color of thorax rather vari- 

 able, varying from pale brown with dark brown vittse to dark brown 

 with black vittae, the spaces between vitt^ grayish pruinescent ; scutel- 

 lum varying from dull yellow to brown. Abdomen entirely black. 

 Legs yellow, mid and hind coxae brownish, bases of fore and mid 

 femora sometimes faintly brownish. Wings clear, veins yellow, cross 

 vein not infuscated. Halteres yellow, knob black. Hairs on body and 

 legs yellow. 



Frontal tubercles absent. Pronotum linear on upper half. Hypo- 

 pygium as in Figure 15, Plate XXXIV. Fore tarsi without long hairs, 

 basal joint nearly twice as long as fore tibiae (40: 22). Cubitus fork- 

 ing distinctly but not greatly beyond cross vein. 



Female. — Agrees with the male in color. 



Length, 2-3 mm. 



Illinois localities: Spoon River, near Havana, September 16, 1895 

 (C. A. Hart) ; Urbana, September 5, at light, jMonticello, June 21 and 

 28, and Muncie, May 24, 1914 (C. A. Hart and J. R. Malloch). 



Originally described from Washington, D. C, and subsequently 

 recorded from Ithaca, N. Y. I have seen specimens from Plummer's 



