82 GENUS XIPHANDEIUM IN NORTH AMERICA 



long yellowisli hristlos at tip, which do not seem to form a spine as they usually 

 do in this genus; hind coxae with one large black bristle and a few minute 

 white hairs on outer surface. Fore femora black with extreme base and tip 

 yellow; middle femora wholly yellow, with three preapical bristles, one in 

 front and two on posterior side; hind femora yellow with apical half or two- 

 fifths black, this black extends nearly to basal third on upper edge; they have 

 one preapical bristle; all femora with short black hairs, no longer ones below. 

 Fore and middle tibiae wholly yellow, each with several bristles above; hind 

 tibiae wholly black. Fore and middle tarsi about as long as their tibiae, in- 

 fuscated from the tip of the first joint, which is nearly as long as the remain- 

 ing four taken together; hind tarsi scarcely as long as their tibiae, wholly 

 black, slightly comj^ressed, with the first and second joints of nearly equal 

 length. Calypters and halteres pale yellow, the former with whitish cilia. 



Wings grayish; third and fourth veins approaching each other a little and 

 then parallel for a short distance at tip, the fourth ending in the apex of the 

 wing; last section of fifth vein three times as long as the cross-vein and reach- 

 ing the wing margin; sixth vein very close to the wing margin and nearly 

 parallel with it, the wing being much narrowed at base. 



9 : Face wide, green, thicklj' covered with gray pollen, divided near its 

 middle by a suture, below which the ground color shows through a little; palpi 

 large, black with gray pollen and black hairs; proboscis black; front violet 

 edged with blue; antennae black, third joint elongate triangular, nearly twice 

 as long as wide, arista thick, apical; a little longer than the antennae, its first 

 joint short; the white beard very thin. Body color about as in the male; 

 coxae, fore and middle femora, their tibiae and tarsi about as in the male, 

 except that the fore coxae are mostly blackish and all coxae have shorter white 

 hair. Hind femora yellow with apical fifth black ; hind tibiae yellow with about 

 apical third black; otherwise about as in the male. 



Described from nine males and six females which I took at 

 Wells, Nevada, June 6, 1915; several males and females taken by 

 J. S. Hine, at Kodiak, Alaska, in June, 1917, and fifteen males 

 and seven females taken by J. M. Aldrich, in Alaska in 1921; 

 cisht taken at Skagway, June 4; ten at Anchorage, June 10 to 

 18; three at Fairbanks, July 1, and one at Healy, June 21. 



The hololypc and allotype were taken at Wells, Nevada, and 

 are in the author's collection. 



Xiphandrium fcmoratum vaiicly pollcx new vari(!ly (Te\(-fig. li.) 



This foim differs from the above (k'scribed male in the inner ai)pciidages of 

 t he hypopygium having a thumb-like projection on their lower edge near th(> 

 middle (fignre [{); the fore coxae also seem to be less yellow at tip. The third 

 antennal joint of what seems to be the female is slightly shorter than <hat of 

 the femak's desci-il^cd above. 



Described fro)n two males and five females which I took at 

 Wells, N(!vada, June 0, 1915; one male taken by Mr. Cole at 



