430 



must be depended upon for the separation of the species, which are 

 very closely allied. 



Illinois localities : Urbana, August 17, 1892, at light; \Miite 

 Heath, May 18, 1889; Champaign, August 3, 1889, at electric light; 

 Carbondale, April 2}^, 1914, swept from vegetation along side of 

 stream; IMuncie, Julv 5, and Monticello, June 21 and 28, all in 1914 

 (C. A. Hart and J. JR. Malloch). 



Originally described from specimens taken at Cabin John, ]\Id., 

 June 3. I have seen specimens from Polk County, Wis. (Baker), 

 and Lafayette, Ind. (Aldrich), 



Early stages undescribed. 



9. Chiroxomus t.^xiapexnis Coquillett 



• Chironomus ta'7iiapennis Coquillett, Proe. IT. S. Nat. Mus., 1901, Vol. 23, p. 607. 



\Mng-markings as in Figure 6, Plate XXXV. Palpus as in Figure 

 II, Plate XXXn. 



There are two specimens in the collection here, which were taken 

 at Algoncjuin, 111., by Dr. W. A. Nason. 



The type series came from INIassachusetts and New Jersey, and 

 the species has been recorded from Illinois, New York, South Dakota, 

 and Pennsylvania. 



Early stages undescribed. 



GROUP B 



Wings icitJwut spots or bauds, at most zvith 

 the cross vein infnscated 



Section I 



Abdominal s&gmenis in hotli sexes with 

 depression on dorsal surface 



10. Chiroxomus lobiferus Say 



Clxironomus lohifenis Say, Jour. Acad. Nat. Sei. Phil., Vol. 3, 1823, p. 12, sp. 1. 

 Cliironomiis lobifer Wiedemann, Aussereurop. Zweifl. Ins., Vol. 1, 1828, p. 16, 

 sp. 14. 



Larva. — Length, 13-15 mm. Red. Head brown, eye spots 

 divided ; labium as in Figures 7 and 8, Plate XXIX ; mandibles nor- 

 mal in form. Dorsal blood-gills four in number, rather short, ventral 

 blood-gills rudimentary, two in number, situated high on side of 

 eleventh segment. 



