310 



Additions to List of Illinois Chironomid^ 



Several of the species which were taken this year are new to 

 science ; others are new to the state Hst ; while in some cases the males 

 of known species are described herein for the first time, and in one 

 instance the female is thus dealt with. In all instances care has been 

 taken to indicate the characters by means of which the additions to our 

 list may be separated from those already recorded by the writer. In 

 considering the number of additions to the Illinois list it is necessary 

 to include Ciilicoidcs biguttatus previously mentioned. 



CERATOPOGONIN.E 

 NEocERATOPOGOisr, n. gen. 



This genus is erected for the reception of Ccratopogon hellus Co- 

 c|uillett, a species unknown to me when my previous paper was written. 



Generic characters: male. — Eyes narrowly separated above; an- 

 tennae elongate, plumose, apical 3 joints much longer than the preced- 

 ing flagellar joints ; legs slender ; third hind tarsal joint short, slightly 

 longer than fourth, the latter obcordate and with the third very slightly 

 longer than fifth ; claws small, slender, simple, subequal ; empodium 

 indistinguishable ; wings with distinct hairs as in Ceratopogon; first 

 and third veins fused, not connected by a cross vein as in Ceratopo- 

 gon; media petiolate. 



Female. — Eyes narrowly separated above ; antennae elongate, basal 

 flagellar joints elongate, not nearly transverse as m Ceratopogon, apical 

 five joints distinctly longer than preceding joints ; tarsal claws unequal 

 in size, the inner twice as long as the outer. 



Type of genus, Ceratopogon belliis Coquillett. 



Neoceratopogon BEivLus Coquillett 



Ceratopogon hellus Coquillett, Proc. U. S. Nat. Miis., Vol. 25, 1902, p. 87. $ 



Female. — Yellowish white, opaque. Face brownish ; upper part of 

 head covered with white pruinescence ; antennae elongate and mouth 

 parts brownish or yellowish. Disc of mesonotum covered with whitish 

 pruinescence; a small brown spot at base of each discal hair; scutellum 

 whitish, a black or brown streak on center; postnotum yellow. Abdo- 

 men yellowish or white above, fuscous on venter. Legs white, marked 

 with fuscous or brown as follows : entire coxse and trochanters, a 

 broad median band on all femora and a very narrow one at apices ; a 

 narrow band near base on all tibiae, a broad median band on fore pair. 



