[407] DIPTERA 21 



This species was originally described from Labrador, and Osten Sacken 

 has already reported its occurrence in Alaska. 



Tabanus sonomensis Osten Sacken. 



Tabanus sonomensis OSTEN SACKEN, Bulletin U. S. Geol. Geog. Survey Terr., 

 in, p. 216, 1877. 



Fox Point, Alaska : Three specimens, captured July 28. Origi- 

 nally described from northern California. 



Tabanus insuetus Osten Sacken. 



Tabanus instietus OSTEN SACKEN, Bulletin U. S. Geol. Geog. Survey Terr., 

 in, p. 219, 1877. 



Virgin Bay, June 26 ; Juneau, July 26 ; Fox Point, Alaska, July 

 28 : Three specimens. Also originally described from northern Cali- 

 fornia. 



Family THEREVID-ffi. 



Thereva melanoneura Loew. 



Thereva melanoneura LOEW, Berliner Ent. Zeitsch., p. 250, 1872. 



Kukak Bay, Alaska : Ten specimens, taken July 4. Originally de- 

 scribed from California. 



Family EMPIDID^. 

 Empis poplitea Loew. 

 Empis poplitea LOEW, Berliner Ent. Zeitsch., p. 16, 1863. 



Sitka, June 16; Yakutat, June zi ; Kukak Bay, July 4; Kadiak, 

 Alaska, July 20 : Thirty-three specimens. Originally described from 

 Alaska. Specimens are in the U. S. National Museum from Colorado. 



Empis clauda sp. nov. 



Black, the palpi, proboscis, humeri, lateral margins of metanotum, 

 scutellum, a large spot below insertion of each wing, the halteres, 

 coxae, and remainder of legs, also base of venter, yellow, apices of 

 tarsi brown ; eyes of male separated less than width of lowest ocellus, 

 third joint of antenna broad at base, tapering rapidly to the apex, 

 about twice as long as the style, proboscis slightly over twice as long 

 as height of head ; hairs and bristles of body and legs black ; mesono- 

 tum opaque, gray pruinose, marked with four, indistinct, brownish 

 vittas ; scutellum bearing four bristles ; abdomen slightly polished, 

 hypopygium small, ascending obliquely, the dorsal piece prolonged at 

 each posterior corner in the form of a flattened, almost linear process, 

 central filament unusually robust, arcuate, free except toward its apex ; 

 no ventral process in front of the hypopygium ; hind femora of male 



