214 



apices very narrowly brown, the apices of all the tarsal joints 

 distinctly browned, the dark color on all parts of the legs very sharply 

 defined, giving the legs a ringed appearance, except on the last three 

 tarsal joints (PI. XIII, Fig. 7). Wings hyaline, veins distinct, 

 brownish. Halteres yellow. Hairs on body yellowish. 



Antennal hairs long; basal joint of palpi shorter than second, 

 joints 2-4 subequal. Mesonotum with the hairs rather soft, most 

 distinct and numerous on the spaces between the vittae ; scutellar hairs 

 long and numerous; pleurse bare. Abdomen with long hairs on both 

 the dorsal and ventral segments. Length of fore tibia 1.25 mm., 

 fore metatarsus 1.75 mm., second joint of tarsus i mm., joints 3 

 and 4 subequal ; fore legs with only extremely short hairs, the other 

 pairs with inconspicuous hairs, the length of which does not exceed 

 the tibial diameter. Fork of cubitus slightly beyond the vertical line 

 of the cross vein ; wing fringe short ; cross vein slightly darkened. 



Length, 5-6 mm. 



Described by Coquillett from Plummers Island, Md., in the 

 Potomac River. 



Illinois localities: Quiver Lake, Illinois River, May 8, 1896 (C. 

 A. Hart), and UrbanarHl, May 25, 1898, in house (C. A. Hart). 



This species is allied to flavicingidata Walker, but in the latter 

 there is generally a more or less distinct brown band on the middle 

 of the hind tibia ; the proportions of the fore tibia and tarsus are, — 

 tibia 1.55 mm., metatarsus 1.56 mm., second joint i mm.; the mid 

 and hind legs of the females of flavicingidata are much more hairy, 

 the fork of the cubitus is generally proximad of the cross vein, and 

 the halteres are brown. The average length of the specimens of 

 flavicingidata before me is 6.5 mm. 



This species was very briefly described, and the foregoing defini- 

 tion is given to facilitate its identification. 



Probably a synonym of dez'inctns Say. 



Chironomus ferrugineovittatus Zetterstedt 



This species, or at least one which agrees in every particular with 

 the description thereof, is abundant in various places along the 

 Illinois River in the vicinity of Havana. The species is rather larger 

 than pluniosus Linne, averaging over 12 mm. in length, and is quite 

 the most conspicuous species of the genus in North America. In 

 structure it agrees very closely with pluniosus, but may be separated 

 In' the thoracic stripes being generally ferruginous in the male, and 

 the basal half of the dorsal surface of the alidomen yellowish (prob- 

 ably more greenish in life). The larva is the largest which I know 



