256 NEW YORK STATE MUSEUM 



femora, yellow; the remainder of the femora black, but the line 

 of division not sharply marked. Fore tibiae white with black 

 bases and tips; middle and hind tibiae yellow with black tips, and 

 sometimes bases also. Fore tarsi dark brown; middle and hind 

 ones yellowish brown, each joint darkened apically; fore meta- 

 tarsus about one half as long as its tibia. Wings bare and spot- 

 less, veins yellow. Venation as figured. Halteres yellow. 



Male. Like the female but with less yellow; antennae brown 

 with yellow basal joints, hairs pale brownish; genitalia white, 

 length 1.5 to 2 mm. Ithaca, N. Y. 



5. Cricotopus bicinctus Meigen. 



1818 Chironomus Meig. Syst Beschr. 1:41, 48 



1850 Chironomus Zett. Dipt. Scand. 9 : 3553, 81 



1864 Chironomus Scliiner. Fauna Austr. 2 : 610 



1874 Cricotopus V. d. Wulp. Tijds. v. Ent. 17 : 132 



1877 Cricotopus V. d. Wulp. Dipt. Neerl. p.271, 2 



1830 Chironomus dizonias Meig. Syst. Beschr. 6 : 252, 101 



Head with the antennae and mouth parts black, the antennal 

 hairs of the male whitish at the tip. Thorax shining black with 

 yellow humeral spots (male) or yellow with wide sometimes con- 

 fluent longitudinal lines (female) ; s-cutellum, metanotum, sternum 

 black. Abdomen black, the first and the fourth segments and in 

 the female the venter also, yellow; the claspers of male snow 

 white. Legs black, fore coxae and the bases of the femora pale 

 yellow; each tibia on its middle section, together with the hind 

 tarsi, except the tips of the joints, white; fore metatarsus one 

 third shorter than its tibiae. Wings whitish, the anterior wing 

 veins and the crossveins pale brown (pl.29, fig.17). ^ength 2% 

 to 3 mm. V. d. Wulp. loc. cit. 



Several specimens from Ithaca, N. Y., agree perfectly with this 

 description. In one or two specimens of the male, the yellow 

 humeral spot is indistinct, and in another it is wanting. In some 

 specimens also the hind legs are pale brown, so that the white 

 tibia! ring is conspicuous only on the fore legs. In some female 

 specimens the thoracic stripes are brownish. 



6. Cricotopus varipes Coquillett 



1902 Cricotopus Coq. Proc. U. S. Nat. Mus. 25 : 93 



Larva. Yellowish, or with a greenish tinge. The body tapers 

 both toward the head and caudal end; hence the middle body 

 segments are of greater diameter. Length 6 to 7 mm. Head 

 dark brown, labrum, and epipharynx resembling C. e x i 1 i s , the 



