475 



cross vein not infuscated. Halteres pale yellow. Hairs on body and 

 legs pale yellow. 



Antenna not much longer than head and thorax combined. Pro- 

 notum linear. Hypopygium with only a poorly developed inferior 

 process on inner surface of basal portion of lateral arm (PI. XL, Fig. 

 2). Legs slender; fore tarsi without long hairs, basal joint twice as 

 long as fore tibiae, proportions of fore tibiae and first and second tarsal 

 joints as 19, 40, and 22; mid and hind legs with rather short hairs; 

 pulvilli and empodia large. Third vein ending but little farther in 

 front of apex of wing than fourth does behind it; cubitus forking very 

 slightly beyond cross vein, the latter situated a little before wing-mid- 

 dle. 



Length, 3 mm. 



Tvpe locality. South Haven, Mich., July 15, 19 14, at light (C. A. 



Hart). 



This species closely resembles flavus, but differs in proportions of 

 basal joint of fore tarsi and in the form of the hypopygium. 



The female and early stages are unknown. 



54. Chironomus tenuicaudatus, n. sp. 



Male. — Agrees in color with modestus. Differs noticeably from 

 both modestus and indistinctus in the structure of the hypopygium, 

 which is shown in Figure 12, Plate XXXHL In other respects agrees 

 with modestus. 



Length, 3.5-4 mm. 



Type localitv, Havana, 111., April 27-28, 1914 (C. A. Hart and J. 

 R. Malloch). Paratypes, 1914, St. Joseph, May 3, and Urbana, May 

 19, 20. Taken by the same collectors. 



This may be the species designated by Johannsen as variety & of 

 modestus''. If so, the pupa differs from that of indistinctus in having 

 the lateral teeth absent from apex of eighth segment, while in other 

 respects agreeing with that species. 



The early stages are unknown to me. 



55. Chironomus neomodestus, n. sp. 



This species differs from indistinctus in having the thorax opaque 

 brownish vellow with blackish gray vittse and very distinct gray prui- 

 nescence. The abdomen is fuscous. Otherwise as indistinctus. 



* Aquatic Nematoeerous Diptera, Bull. 86, N. Y. State Mus., 1905, p. 228. 



