426 

 GROUP A 



Species witJi wings spotted or handed 

 I. Chironomus brachiai^is Coquillett 



CJiironomus brachialis Coquillett, Proe. U. S. Nat. Mus., Vol. 23, 1901, p. 607. 



Male. — Head entirely yellow. Thorax glossy black, the areas be- 

 tween those generally occupied by the vittae in other species usually 

 brown, scutellum and lower portions of pleurae sometimes brownish; 

 postnotum black. Abdomen yellow, dorsum of second segment black- 

 ened, narrowly at base, the black becoming broader posteriorly and 

 extending laterally in the form of a narrow postmarginal band, bases 

 of all but the apical two segments narrowly black, the last two and the 

 hypopygium entirely black. Legs yellow, fore legs from before apices 

 of femora, with the exception of basal two-thirds of metatarsi, black- 

 ened, as also the extreme apices of femora, bases and apices of tibiae, 

 and apices of tarsal joints of other legs. Wings as in Figure 2, Plate 

 XXXV. Halteres yellow. Antennal plumes yellow ; all surface hairs 

 on body and legs yellow. 



Antennae with basal joint globose, entire length not exceeding that 

 of head and thorax together. Discal hairs on mesonotum soft and 

 inconspicuous, those on scutellum rather numerous but soft. Hypo- 

 pygium as in Figure 8, Plate XXXHI. Fore tibia subequal in length 

 to fore femur; basal joint of fore tarsus about one and a third times 

 as long as fore tibia, its apical half and the whole of second joint with 

 long soft hairs on posterior surfaces ; mid and hind legs with the sur- 

 face hairs barely as long as diameter of joints on which they are situ- 

 ated. 



Female. — Similar in coloration to the male except that the thorax 

 is usually entirely black. The fore legs are entirely black with the ex- 

 ception of the basal four fifths of the femora. 



Antenna not over half as long as head and thorax combined, the 

 hairs as long as apical joint. Fore tarsus without the long hairs; sur- 

 face hairs on legs much shorter than diameter of the joints which 

 bear them. 



Length, 5-6.5 mm. 



Illinois locality, Havana, September. Three males and one female. 

 Originally described from Westville, N. J-, ^nd also recorded from 

 Ithaca, N. Y. (Johannsen). 



The early stages are undescribed. 



