[413] DIPTERA 27 



dant, on the abdomen sparse, scutellum bearing four bristles ; under 

 side of front and middle femora, both sides of the hind ones and outer 

 side of the hind tibiae ciliate their entire length with rather long hairs, 

 first joint of hind tarsi noticeably thicker than that of either of the other 

 tarsi, much narrower than the hind tibiae ; wings hyaline, veins and 

 stigma brown, venation normal, last section of fifth vein two-thirds as 

 long as the preceding section, sixth vein obsolete beyond end of anal 

 cell. Length 2 mm. A male specimen, collected July 20. 



Habitat. Kadiak, Alaska. 



Type. Cat. no. 5218, U. S. National Museum. 



Microphorus flavipilosus sp. nov. 



Black, the hairs, stems of halteres, femora and tibiae, yellow, knobs 

 of halteres and the tarsi brown ; eyes of male contiguous, third joint 

 of antennae sublanceolate, only slightly tapering to the apex, over four 

 times as long as the style, proboscis noticeably shorter than height of 

 head, mesonotum highly polished, scutellum bearing about ten mar- 

 ginal bristles, abdomen slightly polished, hairs of legs sparse and rather 

 short, first joint of hind tarsi slightly thicker than that of any of the 

 other tarsi; wings hyaline, stigma smoky brown, veins yellowish 

 brown, last section of fifth vein one-fourth as long as the preceding 

 section, sixth vein reaching almost to the wing margin; length 2 mm. 

 Two male specimens, collected June 3. 



Habitat. Lowe Inlet, British Columbia. 



Type. Cat. no. 5219, U. S. National Museum. 



Microphorus crocatus sp. nov. 



Yellow, the head and its members, a median vitta on mesonotum, 

 dorsum of abdomen, and apices of tarsi dark brown, third joint of an- 

 tennae sublanceolate, only slightly tapering to the apex, about twice as 

 long as wide, five times as long as the style ; proboscis about as long 

 as height of head; hairs of body sparse and rather short, yellow; 

 mesonotum polished, scutellum bearing about eight bristles, abdomen 

 polished; hairs of legs very short, first joint of hind tarsi slightly 

 thicker than that of any of the other tarsi ; wings hyaline, veins yel- 

 lowish brown, stigma almost obsolete, last section of fifth vein nearly 

 half as long as the preceding section, sixth vein ending a short dis- 

 tance from the wing margin. Length 2 mm. A female specimen, 

 collected June 26. 



Habitat. Sitka, Alaska. 



Type. Cat. no. 5220, U. S. National Museum. 



