430 



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

 very closely allied. 



IlHnois localities : Urbana, August 17, 1892, at light; White 

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

 Carbondale, April 23, 1914, swept from vegetation along side of 

 stream; Muncie, July 5, and Monticello, June 21 and 28, all in 1914 

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



Originally described from specimens taken at Cabin John, Md., 

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

 and Lafayette, Ind. (Aldrich). 



Early stages undescribed. 



9. Chironomus t^niapEnnis Coquillett 



Chironomus tceniapeymis Coquillett, Proc. U. S. Nat. Mus., 1901, Vol. 23, p. 607. 



Wing-markings as in Figure 6, Plate XXXV. Palpus as in Figure 

 II, Plate XXXII. 



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

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



The type series came from Massachusetts and New Jersey, and 

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

 and Pennsylvania. 



Early stages undescribed. 



GROUP B 



Wings without spots or bands, at most zvith 

 the cross vein infuscated 



Section I 



Abdominal segments in hotli sexes with 

 depression on dorsal surface 



10. Chironomus i,obife;rus Say 



Chironomus lohiferus Say, Jour. Acad. Nat. Sei. Phil., Vol. 3, 1823, p. 12, sp. 1. 

 Chironomus 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. 



