474 



52. Chironomus flavus Johannsen 



Chironomus flavus Johannsen, Bull. 86, N. Y. State Mus., 1905, p, 225. 



Larva. — Johannsen describes the larva as being 6 to 7 mm. in 

 length, pale yellowish green, head brown. The labium is as in Figure 

 4, Plate XXIX, which is reproduced from Johannsen's figure. 



Pupa. — Johannsen's description of the pupa gives the length as 

 3.5 to 4 mm. and the color as pale yellow with yellowish brown 

 thorax. The thoracic respiratory organs are of the normal form in 

 this genus. Abdominal segments 2-5 have each a transverse band of 

 short setae near the anterior margin and the disc covered with similar, 

 smaller setae enclosing several small circular clear spaces; the lateral 

 fin of the eighth segment "has the usual filaments, each fin terminating 

 in a toothed process, deep brown in color." 



Imago; Male. — Similar to fiilvus. Differs in being much paler, 

 the abdomen and legs being entirely pale yellow. The fore tarsi differ 

 from those of fiilvus in having the second joint distinctly longer than 

 the fore tibiae. In freshly emerged specimens of flavus and fiilvus the 

 long hairs on the fore tarsi are readily seen, but in specimens that have 

 been on the wing for some time, or have been handled much, the hairs 

 are usually seen with difficulty or are entirely absent. The hypopygium 

 is as in Figure 14, Plate XXXIV. 



Female. — Similar to the male in color and in comparative lengths 

 of fore tibiae and tarsi. 



Length, 2.5-3.5 mm. 



Illinois localities : Havana, June ; Muncie, May 24 ; Monticello, 

 June 24; Urbana, June 18 and September 5; Momence, July 17, — all 

 in 19 14. Momence and Urbana specimens taken at light, the others 

 swept from vegetation on the banks of rivers (C. A. Hart and J. R. 

 Malloch). 



Originally described from Ithaca, N. Y. Specimens from the type 

 locality have been furnished me by Professor Johannsen. 



53. Chironomus curtilamellatus, n. sp. 



Male. — Pale yellowish green, subopaque. Head yellow; scape of 

 antennae reddish yellow, flagellum pale brown, plumes brownish at 

 apices, yellowish at bases. Mesonotum with faint indications of red- 

 dish vittae, pleural spots and postnotum reddish yellow. Abdomen 

 slightly browned on apical three segments. Legs pale yellow, fore 

 tibiae and tarsi and apices of mid and hind tibiae slightly browned; mid 

 and hind tibiae with brown apical comb. Wings clear, veins yellow, 



