[393] DIPTERA 7 



tibire brownish yellow, tarsi brown ; halteres dark brown, base of the 

 peduncle yellow ; wings grayish hyaline, last section of first vein dis- 

 tinctly longer than the preceding section, apex of first vein noticeably 

 beyond the forking of the fourth, lower fork of the fourth vein con- 

 siderably shorter than the preceding section of this vein. Length 4 

 mm. A female specimen, collected June 16. 



Habitat. Sitka, Alaska. 



Type. Cat. no. 5193, U. S. National Museum. 



Family SIMULIID.E. 



Simulium ochraceum Walker. 



Simulium octiraceum WALKER, Trans. Ent. Soc. London, p. 332, 1861. 



Lowe Inlet, British Columbia, June 6; Sitka, Alaska, June 16; 

 Virgin Bay, June 26 ; Kukak Bay, Alaska Peninsula, July 4 : Ten 

 specimens. Originally described from Mexico. The U. S. National 

 Museum contains specimens collected in the mountains of Colorado 

 and Montana. 



Simulium invenustum Walker. 



Simulium invenustum WALKER, List Dipt. Ins. Brit. Mus., I, p. 112, 1848. 

 Simulium pecuarum RILEY, Report U. S. Dept. Agric., p. 512, 1886. 



Metlakahtla, June 4; Sitka, June 16; Yakutat, June 21; Virgin 

 Bay, June 26; Kukak Bay, July 4; Popof Island, July 8, 10, n 

 and 16; Kadiak, Alaska, July 20: Twelve specimens. Originally de- 

 scribed from Hudson Bay, British America. In the United States its 

 known range extends from New Hampshire southward to Mississippi, 

 and westward to Colorado. 



Simulium venustum Say. 



Simulium venustum SAY, Jour. Acad. Nat. Sciences, Philadelphia, p. 28, 



1823. 



Simulium molestum HARRIS, Insects Inj. Vegetation, 3d edit., p. 601, 1862. 

 Simulium piscicidium RILEY, Amer. Entomologist, n, p. 367, 1870. 



Metlakahtla, June 4; Kukak Bay, July 4; Popof Island, July 8 to 

 1 1 : Twelve specimens. The type locality of this species is given by 

 Say as " Shippingport, Falls of the Ohio." Shippingport is the old 

 landing on the Kentucky side below the Falls of the Ohio. Its site is 

 covered by the present city of Louisville, Kentucky. This species occurs 

 all over the United States, as well as in Canada and British Columbia. 



Simulium vittatum Zetterstedt. 



Simulium vittatum ZETTERSTEDT, Insecta Lapponica, p. 803, 1840. 

 Simulium argus WILLISTON, North American Fauna, No. 7, p. 253, 1893. 



Yakutat, June 21; Kadiak, Alaska, July 20: Twelve specimens. 



