435 



Length, 4.5-6 mm. 



Illinois localities : Illinois River and connected waters at and near 

 Havana, the imagines occurring in abundance on tree trunks and 

 houses and flving near the river in late April and May; Carbondale, 

 April 23, 1914 (C. A. Hart and J. R. Malloch). 



Originally described from Ithaca, N. Y., from which locality 1 

 have had a specimen submitted by Professor Johannsen. The species 

 is also recorded by him from New Jersey. I have examined speci- 

 mens of this species belonging to the collection of the U. S. Bureau 

 of Biological Survey which were taken by W. L. McAtee at Plum- 

 mer's Island, Md., and Washington, D. C, in June, July, and August. 



The record of alhipennis Meigen for New Jersey is probably 

 based upon a specimen of this species. 



14. Chironomus falIvAX Johannsen 



Cliirommus fallax JohaDnsen, Bull. 86, N. Y. State Mus., 1905, p. 210. 



Male. — Glossy black. Head black; scape of antennae brown, fla- 

 gellum greenish; palpi greenish yellow. Thorax black, the spaces be- 

 tween the normal vittse very faintly pruinescent; scutellum brown- 

 ish. Abdomen whitish green, the apical two segments and base of 

 hypopygium black, apical portion of lateral arms of hypopygium yel- 

 lowish. Legs whitish yellow, fore coxse and a broad median band on 

 fore femora black. Wings clear, veins almost vitreous. Halteres 

 whitish yellow. Plumes of antennae and hairs on legs whitish yellow. 



Pronotum very short, almost linear, not continued to upper mar- 

 gin of mesonotum; scutellum convex, rather longer than usual. 

 Apical portion of lateral arm of hypopgium longer than basal (PI. 

 XXXIII, Fig. 7). Fore tarsi very slender, bare, basal joint more 

 than one and a half times as long as fore tibia. Mid and hind legs 

 with long hairs. Wing with third vein almost to apex ; cubitus fork- 

 ing distinctly beyond cross vein, the latter slightly before wing-middle. 



Female. — Differs from the male in having the head and its mem- 

 bers yellowish, only the last joint of antennae being black; the scutel- 

 lum, basal segment of abdomen, and apices of remaining segments 

 yellow. 



Length, 3-4 mm. 



Illinois localities: Monticello, June 28, Momence, July 14, at 

 light, and Centerville, August 16, 1914 (C. A. Hart and J.R. Mal- 

 loch). 



Originallv described from Ithaca, N. Y. I have seen two females 

 from the type locality, kindly submitted by Professor Johannsen. 



