MAY PLIES AND MIDGES OF NEW YORK 213 



1850 Chironoruus Zett. Dipt. Scand. 9 : 3485, 4 



1864 Chironoinus Schiner. Fauna Austr. 2 : 602 



1877 Chirononius V. d. Wulp. Dipt Neerl. p.253, 7 



1804 Ghironoruus annulatus Meigen. Klass. 1 : 12, 2 



1818 Cbironoruus pallens Meigen. Syst. Beschr. 1 : 22, 5 



1818 Chironomus tristis Meigen. Syst Beschr. 1 : 48, 62 



This species resembles riparius but differs in having the 

 posterior margins of the abdominal segments grayish, not sharply 

 separated from, but blended into, the black; and in having the 

 third and fourth tarsal joints of the fore legs subequal in length. 



Male. Head aud antennae blackish, palpi aud pro/boscis fuscous. 

 Dorsum of the thorax cinereous with three dull, black stripes; 

 metanotum, pleura, and sternum dull black, slightly pruinose; 

 scutelluin fuscous. Abdomen fuscous or black, the posterior 

 margins of the segments grayish, the hairs yellowish, genitalia 

 small, black. Coxae blackish; legs subfuscous, tarsi slightly 

 darker. Fore metatarsus about one fifth longer than the tibia, 

 the third and fourth tarsal joints about equal in length, the fore 

 tarsi and the middle and hind legs long-haired. The wings 

 hyaline, the anterior veins dark, particularly the crossveiu. The 

 venation as figured (pl.28, fig.ll). Halteres whitish. Length 

 7 to 8 mm. 



Female. Like the male but the anterior tarsi are bare, and in 

 the single specimen the tips of the femora are darkened. Ithaca, 

 N. Y. A darker variety (var. tristis Meig.) with slightly infus- 

 cated halteres from Washington State. 



I have compared my specimens with specimens from Europe 

 and can detect no differences. 



23. Chironomus dispar Meigen 



1830 Chironomus Meigen. Syst. Beschr. 6 : 247, 85 



1850 Chironomus Zett. Dipt. Scand. 9 : 3506, 22 



1864 Chironomus Schiner. Fauna Austr. 2 : 604 



1877 Chironomus V. d. Wulp. Dipt. Neerl. p.257, 13 



1838 Chironomus lucid us Zett. Ins. Lappon. p.SlO, 5 



1850 Chironomus Zett. Dipt Scand. 9 : 3509, 25 



'Shining black; the abdomen somewhat brownish, with paler 

 hairs and occasionally reddish yellow lateral spots; the anal 

 segment narrower and shorter than the preceding segment; the 

 forceps strong, its arms nearly as long as the last abdominal seg- 

 ment. Head black, the palpi brown, the antenna together with 

 its hairs blackish. The legs yellow, the coxae brown ; the tibiae 

 brown at the tip, fore tarsi delicately ciliate, the metatarsus one 

 half longer than its tibia. Wings whitish. The crossvein not 



