491 



is much more robust. Legs slender ; basal joint of fore tarsi twice as 

 long as fore tibise (30: 15) ; mid and hind legs with long hairs. Third 

 vein ending at beginning of apical curve of wing; cross vein slightly 

 before middle of wing; cubitus forking distinctly beyond cross vein. 



Female. — Agrees with the male except in sexual characters and in 

 having the cross vein more distinctly proximad of middle of wing. 



Length, 1.5-2.25 mm. 



Illinois localitv, Muncie, Mav 24, 1914 (C. A. Hart and J. R. Mal- 

 loch). 



This European species has been recorded by Johannsen from 

 Ithaca, N. Y., and Brookings, S. Dak. 



Early stages undescribed. 



This species is very difficult to observe in the field owing to its 

 small size and the pale color of abdomen and legs, the dark thorax 

 alone showing clearly. 



7. Tanytarsus tenuis Meigen 



Chironomus tenuis Meigen, Syst. Beschr. Eur. Zweifl. Ins. Vol. 6, .1830, p. 255, 

 sp. 112. 



This species agrees in color and length with neoflaz'cllus, but dif- 

 fers noticeably in the proportions of the fore tiljia^ and first and sec- 

 ond joints of fore tarsi, the respective proportions being 20, 40, 20. 

 The third vein ends slightly farther from apex of wing than in neofla- 

 Z'cllus, while the cross vein is much nearer to base of wing than in 

 that species, the distance from base of first vein to cross vein as com- 

 pared with that from cross vein to apex of wing being as 22 to 46, 

 while in neofiavellus they are as 36 to 5 1 . In other respects the species 

 are very similar. 



Length, 3 mm. 



Illinois locality, Rock Island, October 20, 1914, at light (C. A. 

 Hart). 



Lundbeck recorded this species from Greenland, and Johannsen 

 from South Dakota and Washington State. I have before me a male 

 specimen, submitted by Professor Aldrich, from Erwin, South Da- 

 kota, June, 1908, which is evidently this species. 



Early stages undescribed. 



8. Tanytarsus viridiventris, n. sp. 



Male. — Head and thorax black, the latter shining. Abdomen 

 bright green. Legs yellowish green, coxae blackened. Wings whitish, 

 veins pale. Halteres pale green. Antennal plumes pale brown. 



