434 



Originally described from Indiana. Johannsen records it from 

 Ithaca, N. Y., while Coquillett redescribed it from Plummer's Island, 

 Md., from which locality I have seen a female in the collection of the 

 U. S. Bureau of Biological Survey. I have al'so seen specimens taken 

 by Professor Aldrich at Lafayette, Ind., on August 5 and October 



2, 1913- 



I suggested the above synonymy in my recent paper*, and believe 

 that it is correct. 



— 13. Chironomus nigricans Johannsen 



Chironomus nigricans Johannsen, Bull. 86, N. Y. State Mus., 1905, p. 219. 



Larva. — Length, 11-12 mm. Blood-red. Antenna rather slender, 

 about a fourth shorter than mandible, joint 2 as long as 3+4; labium 

 with the median tooth divided and distinctly longer than the other 

 teeth, first and fourth lateral teeth shorter than second and third. No 

 ventral blood-gills, two dorsal pairs present. 



Pupa. — Length, 5.5-6.5 mm. Pale brown. Segments 2-6 with 

 a transverse band of short blackish setulse near the anterior margin, 

 the disc covered with shorter, paler setulse enclosing numerous small 

 rounded bare spaces, the setulae becoming larger and darker posteri- 

 orly, forming a bandlike patch near posterior margin; second seg- 

 ment with the normal apical series of black setulse ; lateral apical 

 process of eighth segment with several rather large teeth. 



Imago; Male. — Head entirely fuscous. Thorax glossy black; 

 pleurae sometimes brownish ; scutellum varying from yellow to 

 brown. Abdomen greenish white, posterior margins of segments 

 narrowly blackened; rarely the apical 2 or 3 segments slightly infus- 

 cated. Legs whitish or greenish. Wings clear, cross vein not in- 

 fuscated. Halteres whitish or greenish. 



Palpi of male as in Figure 8, Plate XXXII. Hypopygium very 

 closely resembling that of fallax, the inferior process as in Figure 3, 

 Plate XXXIV. Fore tarsi with long hairs; basal joint about one 

 sixth longer than fore tibiae (75:65). Third vein ends as far be- 

 fore apex of wing as fourth does behind it; cubitus forks almost 

 directly below cross vein. 



Female. — Glossy black or blackish brown. Antennae pale yel- 

 low, basal and apical joints generally fuscous. Scutellum sometimes 

 brownish yellow. Abdomen with narrow pale hind margins to dor- 

 sal and ventral segments or the former entirely dark. Legs whitish 

 yellow. Halteres pale yellow. 



Differs from the male in having the fore tarsi without long hairs. 



*BuIl. 111. State Lab. Nat. Hist., Vol. 10, Art. 4, 1914, p. 214. 



