MAY PLIES AND MIDGES OF NEW YORK 213 



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



18G4 Chironoiuus Schiner. Fauua Austr. 2 : G02 



1877 C h i r o n o m u s V. d. Wulp. Dipt Neerl. p.253, 7 



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



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



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



This species resembles r i p a r i u s 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 and antennae blackish, palpi and proboscis fuscous. 

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

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

 scutellum fuscous. Abdomen fuscous or black, the posterior 

 margins of the segments grayish, the hairs yelloAvish, 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 lengi:]i, the fore 

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

 hyaline, the anterior veins dark, particularly the crossvein. 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.) Avith slightly infus- 

 cated halteres from Washington State. 



I have compared my sipecimeus ^^■ith specimens from Europe 

 and can detect no differences. 



23. Chironomus dispar Meigen 



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



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



1864 Ohironomus Schiner. Fauna Austr. 2 : 604 



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



1838 Ohironomus lucid us Zett. Ins. Lappon. p.810, 5 



1850 Ohironomus 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, tlie paljvi 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 loueer than its tibia. Wines whitish. The crossvein not 



