378 



apices of all tibiae deep brown. Wing with about twelve spots 

 formed by brown hairs : three or four between the media and radius, 

 two between upper branch of cubitus and media, two between 

 branches of cubitus, and three between the posterior margin and 

 cubitus. 



Structurally this species is very similar to illinocnsis, but it is 

 rather more slender and the wing is narrower. I have only a single 

 specimen before me, and having refrained from detaching the hypo- 

 pygium it is of course impossible to discover in what respects that dif- 

 fers from the hypopygium of illinocnsis. As the tarsi of the fore legs 

 are broken off I am unable to compare their proportions with those of 

 the tarsi of illinocnsis. The different coloration of the two species 

 should serve to separate them readily. The mid and hind tibise have 

 surface hairs which are at least three times as long as the diameter of 

 the tibiae. 



Length, 3 mm. 



Illinois localities: Algoncjuin, June 6, 1895 (^- A. Nason) ; 

 Urbana, July 7, 1914, at light (J. R. Malloch). 



Originally described by Cocjuillett from Las Vegas Hot Springs, 

 New Mexico, and subsequently recorded by Johannsen from Leland 

 Stanford Jr. University, California. 



10. Tanypus carneus Fabricius 



Tanypus carneus Fabricius, Syst. Antl., 1805, p. 41; sp. 16. 



Larva. — I have seen only a single larva of this species from the 

 Illinois River. It resembles monilis very closely and is of the same 

 length (6 mm.), but may be separated by means of the following 

 characters : — 



Reddish yellow in life, almost white when preserved in alcohol. 

 Head very long, almost three times as long as wide ; antenna with the 

 basal joint about three fourths the entire length; labial plate as shown 

 in Figure 3, Plate XXV; posterior pseudopods with rather slender 

 claws, all of them pale brownish. 



Pupa. — "Yellowish ; length, 4 mm. Respiratory trumpet cucumber 

 shaped, with basal end somewhat curved and tapering; near the base 

 of each is an arcuate transverse line of pale, blunt tubercles. Abdom- 

 inal segments nearly devoid of setae. The caudal fin consists of two 

 pointed processes, each with a pair of pale, slender filaments, and on 

 the lateral margin of each of the last 2 segments are four or five of 

 such filaments." — Johannsen. 



Imago; Male. — Head pale yellow, including basal joint of an- 

 tenna. Thorax pale yellow, with three wide buff stripes, or it may be 



