468 



Island, Md. (May, July, and August), from Currituck, N. C. (Sep- 

 tember 9), and from Graham Mountain, Ariz. (May, 1914), all in the 

 collection of the U. S. Bureau of Biological Survey; also specimens 

 from Cedar Lake, Ind., July 17, 1914 (C. A. Hart), and from Wingra 

 Lake, Wis., August 8, 19 13, at light (A. C. Burrill). 

 The early stages are undescribed. 



45. Chironomus NiTiDELiwUS Coquillctt 



Chironomus nitidellus Coquillett, Proc. U. S. Nat. Mus., Vol. 23, 1901, p. 608. 



Male. — Glossy black. Head brownish, face and palpi yellow; 

 scape of antennae glossy black, flagellum and plumes yellowish brown. 

 Thorax highly glossy, black, disc without traces of pruinescence ; scu- 

 tellum brownish ; postnotum glossy black. Abdomen glossy black, yel- 

 lowish at base ; hypopygium brownish. Legs yellow, coxae, femora ex- 

 cept bases, the entire fore tibiae and narrow apices of mid and hind 

 pairs deep black ; tarsi brownish apically, fore pair blackened from 

 before apex of basal joint. Wings clear, veins brow^n. Halteres 

 whitish. 



Frontal tubercles absent; antennae over 1.5 times as long as head 

 and thorax together; palpi much longer than height of head. Disc of 

 mesonotum almost bare. Hypopygium almost identical with that of 

 Tanytarsus obediens (PI. XXXVI, Fig. 9). Legs slender; fore tarsi 

 bare, basal joint about one fifth longer than fore tibiae (51 : 40) ; mid 

 and hind legs with rather short hairs. Third vein ending about as far 

 in front of apex of wing as fourth does behind it ; cubitus forking 

 slightly beyond cross vein. 



Female. — Agrees in color with male, except that the pale color at 

 base of abdomen is not so noticeable. 



Length, 2.5-3 mm. 



Locality, Berrien Springs, Mich., July 16, 1914 (C. A. Hart). 

 This species has not been taken in Illinois as far as I am aware, but 

 one may safely assume from its occurrence in the above locality that 

 it very probably occurs in this state. 



Originally described from Riverton, N. J., and not subsequently 

 recorded. I have seen specimens, submitted by Mr. Cresson from 

 Swarthmore, Pa., and from Delaware. 



46. Chironomus griseus, n. sp. 



Male. — Black. Head brown; face yellowish; antennae fuscous, 

 the plumes silvery gray. Thorax covered with pale gray pruinescence, 



