396 COQUILLETT 



ters, and bases of femora and of tibiae, yellow; posterior margins of 

 abdominal segments whitish ; mesonotum polished ; abdomen sub- 

 opaque ; wings black, the extrem» base and a vitta extending from it 

 three-fourths the length of the wing, between the fourth and fifth 

 veins, white ; length 2.5 mm. Five male specimens, collected June 16. 



Habitat. — Sitka, Alaska. 



Type. — Cat. no. 5195, U. S. National Museum. 



Readily distinguished from our other two species by the coloring of 

 the wings. 



Eutanypus borealis Coquillett. 



^utanyptis borealis Coquillett, The Fur-seals and Fur-seal Islands N 

 Pacific, IV, p. 341, 1899. 



Muir Inlet, Alaska: A single specimen, collected June 12. This 

 species was originally described from the Bering Islands, but also oc- 

 curs in New Mexico and New Hampshire. 



Geratopogon arcticus sp. nov. 



* Black, the knobs of the halteres and hairs on apical portion of 

 antennae of male, and entire antennae of female, whitish ; thorax 

 polished, the abdomen opaque ; femora slender, destitute of spinous 

 bristles, first tarsal joint at least twice as long as the second, the last 

 joint not spinose below, claws minute and of an equal size; wings 

 hyaline, bare, the third vein on its basal fourth united to the first 

 Vein, tip of the latter nearly opposite apex of first third of the third 

 vein, apex of third vein at about three-fourths length of wing, petiole 

 of second posterior cell slightly shorter than the small crossvein. 

 Length i mm. One male and eleven females, collected July 8 to 16. 

 Habitat. — Popof Island, Alaska. 



' Type. — Cat. no. 5196, U. S. National Museum. 



Ceratopogon femoratus Fabricius. 



Ceratopogon femoratus Fabricius, Systema Antliatorum, p, 45, 1805. — 

 WiNNERTZ, Linnaea Entom., p. 68, 1852. 



Popof Island, Alaska: A male specimen, collected July 13. This 

 European species has not heretofore been reported from our Continent. 



Ceratopogon hirtulus sp. nov. 



Dull black, the legs and halteres yellow, hairs mostly light colored ; 

 mesonotum subopaquc, thinly dark grayish pruinose ; abdomen some- 

 what polished ; femora slender, destitute of spinous bristles, first joint 

 of tarsi longer than the second, fifth joint not spinose below, claws 

 minute and of an equal size; wings grayish hyaline, bare except a few 



