168 CALIFORNIA ACADEMY OF SCIENCES [Pioc. 4th Ser. 



Holotype, female, No. 821, Mus. Calif. Acad. Sci. ; collected 

 hy G. Dallas Hanna, July 20, 1920. 



T\pe locality, St. Paul Island, Alaska. 



This interesting form can be recognized by the row of 12 

 or more little black bristles of nearly equal length on the anterior 

 edge of the outer side of the fore coxae, the very short middle 

 tarsi, especially the short first two joints, and the dark wings, 

 together with the metallic face, black halteres and the black 

 calypters with their pale cilia. 



