244 NEW YORK STATE MUSEUM 



veins nearly colorless. Tlie thoracic stripes of some specimens 

 are ferruginous; the ground color of the entire insect in this case 

 verges toward green; the antennal hairs of the male is then also 

 mainly pale yelloAv. In this species the pale thorax contrasts 

 strongly with the dusky abdomen. Translation; V. d. Wulp. 

 loc. cit. 



According to Zetterstedt (1850) the ratio of fore metatarsus to 

 tibia is the same as in plumosus (i. e. one and one fourth to one). 

 This is the case in specimens from Ithaca, N. Y., Idaho, South 

 Dakota, Utah, Iowa. 



63. Chironomus prasinus Meigen 



1818 Chironomus Meig. Syst. Beschr. 1 : 22, 4 



1877 Chironomus V. d. Wulp. Dipt. Neerl. p.250, 2 



1839 Cliironomus intermedius Staeg. Krojer : Naturh. Tids. 



2 : 559, 3 



1850 Chironomus Zett. Dipt. Scand. 9 : 3484, 3 



1864 Chironomus Schiner. Fauna Austr. 2 : 601 



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



1818 Chironomus pilipes Meig. Syst. Beschr. 1 : 26, 13 



Resembles p 1 u m o s u s but is suialler, the abdomen in living 

 specimens is light green (which color in dried si'ecimens becomes 

 yellowish) with blackish dorsal spots which sometimes spread out 

 in the form of a cross band, seldom wanting; posterior margins 

 of the segments with a Avhitish sheen ; abdomen of the female 

 darker; with greenish white pollinose, jjosterior margins to the 

 segments. The ratio of tibia to metatarsus, the hair of the legs, 

 etc., like jjlumosus. Length 7.5 to 1) mm. Translation. V. d. Wulp, 

 loc. cit. Northwest of North America. Osten-Sacken (1878). 

 Idaho, Minnesota, New York. 



According to Hammond (1885) the larva is blood red, and pos- 

 sesses both anal and ventral blood gills. Judging from a draw- 

 ing given by him the labium of the larva appears to be like that 

 figured on pi .37, fig.25. 



64. Chironomus polaris Kirby. 



1824 Chironomus Kirby. Suppl. App. Parry's 1st Voyage. CCXVIH 



1831 Chironomus Curtis. Ross' Voyage. LXXVII 



1878 Chironomus Ost. Saclc. Cat'l. Dipt. N. A. p.21 



1898 C h i r o n o m u s Lundb. Vidensk. Meddel. p.28S 



Black, hairy, wings lacteous, iridescent, the costa fuscous with 

 nervures darker, haltercs dirty ochre. Length 7.5 mm. Breadth, 

 12 mm. Curtis, loc. cit. 



