268 NEW YORK STATE MUSEUM 



2. Orthocladius politus Coquillett 

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



Male. Head yellow, antennae brown, its hairs yellowish brown ; 

 thorax yellow, the three vittae on mesonotum, spot below each 

 wing, the breast and metanotum black, mesonotum highly polished, 

 scutellum brownish yellow, polished, its base opaque blackish ; 

 abdomen yellowish brown, becoming darker toward the apex ; legs 

 brown, trochanters and extreme bases of femora yellow, middle 

 and hind tibiae and bases of their tarsi dull yellowish, legs only 

 pubescent, fourth tarsal joint slender, as long as the fifth, first 

 joint of front tarsi three fourths as long as the tibiae; wings 

 hyaline, small crossvein not darker than the adjacent veins, U^+- 

 almost straight; halteres yellow; length, 2.5 mm. Washington 

 D. C. Coquillett, loc. cit. ; New Jersey, (Johnson). 



3. Orthocladius frigidus Zetterstedt 



1838 Chironomus Zett. Ins. Lappon. p.S12, 14 



1850 Chironomus Zett. Dipt. Scand. 9 : 3516, 33 



1872 Chironomus Holmgr. Ofv. K. Vet. Akad. Forh. 29 : 105 



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



1898 Chironomus Lundb. Vidensk, Meddel. p.279, 61 



1902 Orthocladius Kertesz. Cat'l. Dipt. 1:218 



Male and female. Black, subopaque, dorsum of the thorax in 

 the male with a testaceous margin; in the female testaceous with 

 three separated black stripes; the wings cinereous hyaline; the 

 antennae and the legs fuscous. Length 3 mm. 



Black, somewhat opaque, and but slightly pubescent. The an- 

 tennal hairs of the male fuscous black. The thorax pale fuscous 

 underneath, the dorsum with three stripes; these in the male are 

 dilated and confluent, in the female separated, black in color, as 

 is also the metathorax; scutellum yellow. Abdomen of the male 

 narrow, of the female more robust ; in both sexes it is black, some- 

 what hairy; the last three segments with pale apical margins. 

 Wings subhyaline, spotless, the crossvein and the radius subfus- 

 cous. Halteres white. The legs wholly fuscous black, tibiae and 

 tarsi slightly paler; somewhat pubescent; fore metatarsus about 

 one fourth shorter than its tibia; fore tarsi bare. Greenland 

 (Staeger, Holmgren and Lundbeck). 



According to Lundbeck (1898,p.280) the species which Staeger 

 (1845, p.354) mentions is not O . f r i g i d u s but O . p u b i - 

 t a r s i s Zett. 



