MAY FLIES AND MIDGES OF NEW YORK . 241 



1850 Chironomus Zett. Dipt. Scand. 9 :3498 



1834 Chironomus nigroviridis Macq. Suit. Buffon. 1 :51 



1850 Chironomus "Zett Dipt Scand. 9:3529 



1839 Chironomus venustus Staeger. Kroj. Nat Tidsskr. 2:562 



1850 Chironomus Zett Dipt Scand. 9:3496 



1864 Chironomus Schiner. Fauna Austr. 2 :603 



1847 Chironomus waldheimii Gimmerth. Bui. Soc. Imp. Nat. 

 Moscou. 20. 2 :142, 69 



Larva and pupa. Miall and Hammond (1900) state that the 

 larva is blood red, and possesses both the ventral blood gills of 

 the eleventh segment and the anal blood gills of the twelfth. The 

 labium is as shown on pl.23, fig.l. The pupa is of the usual type, 

 resembling the one shown on pl.16, fig.2. The abdominal mark- 

 ings and the spurs of the lateral fin of the eighth segment are not 

 described. 



Imago, male and female. Head yellowish; palpi and antennae 

 dark brown, the last usually yellowish or reddish yellow at the 

 base, the antennal hairs of the male pale brown with reddish 

 yellow sheen; very dark varieties (var. nigroviridis) dark brown 

 with pale brownish sheen. Thorax yellow, yellowish green, 

 sometimes very pale green; the thoracic stripes, the pleura and 

 the sternum chestnut, sometimes ferruginous, sometimes blackish ; 

 the meta thorax always blackish brown ; the middle thoracic stripe 

 of the male divided by a fine depressed line, in the female more 

 distinctly separated. Abdomen of the male a translucent green 

 or yellowish green; the second and the following segments each 

 with a large blackish brown dorsal mark which frequently is in 

 the form of a cross band; the last segments are wholly blackish 

 brown, with a whitish shimmer ; abdomen of the female blackish 

 brown with pale green pruinose margins to the segments. Legs 

 pale green or yellowish ; tips of the tibiae and of the tarsal joints 

 brown; the fore metatarsus 1.5 times as long as the tibia, and 

 nearly twice as long as the second joint; the following joints 

 gradually diminishing in length; the fore tarsi bare. Halteres 

 yellowish. Wings hyaline, the veins pale brown, the crossvein 

 usually slightly clouded. Length 5.75 to 7.5 mm. Connecticut, 

 Pennsylvania, South Dakota, Kansas. 



61. Chironomus stigmaterus Say. 



1823 Chironomus Say. Journ. Acad. Nat. Sc. Phil. 3 : 15, 6 



1859 Ohironomus Say. Compl. Wr. 2:42, 6 



1828 Chironomus glaucurus Wied. Aussereurop. zweifl. 1 : 15, S 



1878 Chironomus Ost Sack. Cat'l. Dipt N. A. p.20 



Tergum pale, toward the tip glaucous. 



Male. Antennae pale yellowish brown; thorax pale cinereous, 

 lines very pale testaceous, sometimes tinged with dusky; scutel 



