505 



I have reared several specimens of this species from larvae obtained 

 in the clear- water reservoir for the city supply in Champaign, 111., De- 

 cember 29. 1914. The specimens emerged January 20 and 21, 1915. 

 One male lived from January 20 to January 26 under conditions simi- 

 l;ir to those menti(»ne(l under Cliirononius viridicollis. 



3. Cricotopus bicin'CTUs Meigen 



Chironomus 'bicinctus Meigen, Syst. Beschr. Eur. Zweifl. Ins., Vol. 1, 1818, p. 41, 



sp. 48. 

 Cricotopits hicincUis Y. d. Wulp, Tijdsclir. v. Ent., Vol. 17, 1874. p. 132. 



Male. — Distinguishal^le from trifasciatus by the color of the 

 thorax and abdomen. The former is almost invariably uniform glossy 

 black, while the latter has the first and fourth segments and apical por- 

 tions of hypc^pygium yellow. 



Structurally the principal differences lie in the proportions of the 

 fore tibiae and tarsi. In bicinctus the tarsi are much more slender and 

 elongate than in trifasciatus, the proportions of tibiae and basal 

 two joints of tarsi being 40, 25, 15, the combined lengths of the latter 

 being ec[ual to that of the tibia,% whereas in trifastiatus the lengths of 

 the same joints combined are distinctly less than that of the tibiae. The 

 hypopygium is figured on Plate XXXVII, Figure i. The wing vena- 

 tion is similar to that of trifasciatus except that the cross vein is usu- 

 ally somewhat thickened and darkened. 



Female. — Agrees with the male in color except that the ground 

 color of the thorax is generally yellow, with three glossy black vittae. 



Length, 1.75-2.5 mm. 



Illinois localities, Parker, Carbondale, Grand Tower, Havana, Du- 

 bois, Muncie, Monticello, Urbana, Momence, — April to November. 

 Commonly occurs at light. 



Originally described from Europe. 



Johannsen recorded this species from New York. I have seen 

 specimens from Niles, Berrien Springs, and South Haven, Mich. (C. 

 A. Hart), and from Lafayette, Ind. (J. M. Aldrich). 



The early stages are undescribed. 



4. Cricotopus sylvestris Fabricius 



Tipula sylvestris Fabricius, Ent. Syst., 1794, p. 252, sp. 89. 

 Chironomus sylvestris Fabricius, Syst. Antl., 1805, p. 47, sp. 46. 

 Cricotopus sylvestris (Fabricius) V. d. Wulp, Tijdschr. v. Ent., Vol. 17, 1874, 

 p. 132. 



Male. — This species bears a strong resemblance to flavibasis, dif- 

 fering principallv in size (2-3 mm.) and in color. The single speci- 



