MAY FLIES AND MIDGES OF NEW YORK 281 



16. Orthocladius pubitarsis Zetterstedt 



1838 Chironomus Zett. Ins. Lappon. p.Sll, 11 

 1850 Chironomus Zett. Dipt, Scand. 9 : 3514, 30 

 1S9S Chironomus Lundb. A' idensk. Meddel. p.280, 62 

 1902 Orthocladius Kertesz. Cat'l. Dipt. 1 : 221 

 1845 Chironomus frigidus Staeger (nee Zett). Krojer: Naturh. 

 Tids. 1:351,4 



Blackish, suibopaque, dorsum of thorax with three bhick stripes; 

 antennae dark, wings white, legs fuscous testaceous, the fore 

 metatarsus nearly as long as its tibia, fore tarsi of the male dis- 

 tinctly pilose; genitalia small, the appendages somewhat leaf- 

 like. Length of the male 3.5 mm. ; of the female 3 mm. 



Male and female. The fore metatarsus nearly as long as the 

 tibia, male genitalia subovate, and the densely pilose fore tarsi in 

 the male distinguishes this species. 



The head, antennae, and palpi blackish. The thorax blackish. 

 or dull cinereous, subopaque, with black stripes. Scutellum and 

 metathorax blackish. Abdomen of the male slender, linear, sub- 

 opaque, black, fuscous pilose, the incisures narrowly whitish, sub- 

 shining, the anal appendage short, subovate, black ; of the female 

 stouter, blackish, pubescent. Legs of the male fuscous testaceous, 

 the middle and hind legs pubescent; the fore femora and tibiae 

 bare, fore tarsi distinctly and densely pilose; in the female paler, 

 the articulations narrowly blackish. The fore metatarsus nearly 

 as long as the tibia, the second tarsal joint about one half as 

 long, Halteres pale. Zetterstedt, loc. cit. Greenland, Lundbeck. 



17. Orthocladius obumbratus n. sp, 

 (P1.30, fig.ll) 



Male. Grayish black. Face yellowish, eye margin, occiput, 

 antennae excepting the second joint, black ; antennal hairs brown- 

 ish or blackish, proboscis and palpi fuscous. Thorax opaque, 

 grayish pruinose, the humeri and the anterior margin sometimes 

 indistinctly yellowish, scutellum broAvn or yellowish brown. Ab- 

 domen fuscous with fuscous hairs, genitalia small. T^gs fuscous, 

 or subfuscous, middle and hind legs hairy; the trochanters and 

 extreme bases of femora yellow ; fore metatarsus about two thirds 

 as long as its tibia. Wings whitish hyaline, anterior veins pale 

 yellowish, posterior veins colorless, crossvein not clouded; R4+5 

 almost straight beyond its middle, bowing only a very little 

 toward the costa ; venation as figured. Halteres pale yellow. 



Female. Somewhat paler than the male; the dorsum of the 

 thorax has three wide blackish stripes, the space between them 



