427 



2. Chironomus varipexxis Coqnillett 



Chironomus varipcnnis Coqnillett, Proc. U. S. Nat. Mus., Vol. 25, p. 94. 



Male. — Opaque brownish black. Antennae yellowish, plumes con- 

 colorous. Thorax with distinct silvery pruinescence except at bases 

 of the discal hairs on mesonotum, on the anterior extremity of the 

 submedian line, and on the lower portions of plevirse. Abdomen 

 blackish brown except a stibtriangiilar patch on middle of posterior 

 margin of each segment, which is paler and covered with silvery prui- 

 nescence. Legs brownish; femora with a yellowish ring near apices, 

 and tibiae at middle and bases of all tarsal joints except the last yellow- 

 ish. Wings as in Figure 7, Plate XXXV. Halteres yellow. 



Antenna longer than head and thorax together, the plumes long 

 and carried well toward apex. Thoracic hairs not conspicuous. 

 (Abdomen and legs broken.) 



Female. — Slightly darker in color than the male, but similarly 

 marked. 



Antenna shorter than thorax to apex of scutellum, the surface 

 hairs much longer than apical joint. Mesonotum with the surface 

 hairs stronger than in male. Hairs on abdomen as long as the seg- 

 ments on which they are situated. Fore tarsus much elongated, the 

 basal joint twice as long as the tibia ; mid and hind legs with moder- 

 ately long surface hairs. 



Length, 2.5-3 ^^• 



Illinois locality, Urbana, May 6, 1890. One male and two 

 females in an aquarium (C. A. Hart). 



Originally described from Las Vegas Hot Springs, N. M. 

 Early stages undescribed. 



3. Chironomus octopunctatus Loew 



Chironomus octopunctatus Loew, Wien Ent. Monatschr., Vol. 5, 1861, p. 33. 



This species is very closely allied to griseopunctatus, described on 

 a later page. It is separable by the difference in the wing-markings. 

 The spot in the middle of the second posterior cell is absent in griseo- 

 punctatus, while the large spot on posterior branch of cubitus in that 

 species is very much reduced in octopunctatus, and the spot in the anal 

 cell of the latter is as distinct as are the other spots. 



Length, 1.5 mm. 



Illinois localitv. Urbana, October 5 and 9, 1914, at light (C. A. 

 Hart and J. R. Malloch). 



