469 



opaque. Abdomen slightly shining, the segments slightly gray prui- 

 nescent on posterior margins; hypopygitim brown. Legs obscurely 

 brownish, darker at apices of femora and at apices and bases of tibiae ; 

 the latter except their extremities and the basal joints of the tarsi 

 whitish yellow. Wings vitreous, veins colorless. Halteres yellow. 

 Hairs on body and legs white. 



Apical joint of palpi not longer than the preceding one. Pronotum 

 rather broad throughout its entire length, reaching almost to upper 

 margin of mesonotum. Hypopygium as in Figure 3, Plate XXXVI. 



Legs of only moderate length, fore tarsi wath long hairs, basal 

 joint about two thirds longer than fore tibiae (50: 30), mid and hind 

 legs with long hairs. Third and fourth veins ending as in Figure 15, 

 Plate XXXIX, cubitus forking almost directly below cross vein. 



Length, 4.5 mm. 



Type locality, South Haven, Mich., July 14-15, 1914 (C. A. 

 Hart). One specimen taken at light and another swept from vegeta- 

 tion on the shore of Lake Michigan. 



Female and early stages unknown. 



47. Chironomus maturus Johannsen 



Chironomus maturus Johannsen, Bull. 124, N. Y. State Mus., 1908, p. 279. 



Male. — Differs from the preceding species in having the antennal 

 plumes brown, the mesonotum with three shining black vittse, the scu- 

 tellum yellowish, the abdominal segments yellow on their apical fourth 

 in addition to the whitish pruinescence, the legs more uniformly 

 brownish yellow, the wings slightly grayish, and the veins brown. 



Frontal tubercles distinct; apical joint of palpi distinctly longer 

 than preapical. Pronotum linear on upper half. Hypopygium as in 

 utahensis, Figure 6, Plate XXXVIII. Legs long and slender. (The 

 males before me have lost the fore tarsi. See under female. ) Third 

 and fourth veins ending as shown in Figure 10, Plate XXXIX ; cubitus 

 forking very slightly beyond cross vein. 



Female. — Agrees in color with the male. Fore tibiae and tarsi as 

 in griseus, but the basal joint comparatively longer (90 : 57). Differs 

 from male in having wings comparatively broader. 



Length, 7-8 mm. 



Illinois locality, Lilly, on the banks of the Mackinaw River, June 

 II, 1914 (C. A. Hart). 



Originally described from Ithaca, N. Y. I have one specimen of 

 each sex, submitted by Professor Johannsen from the type locality. 



Early stages undescribed. 



