30 PROCEEDINGS OF THE NATIONAL MUSEUM vol. OG 



24. ARGYRA ALBICOXA, new species 



Male. — Length, 4.5 mm. Face silvery white, rather wide. Front 

 almost wholly covered with silvery pollen. Palpi yellowish. An- 

 tennae black; first joint with numerous hairs above; third joint 

 broad, rounded at tip, scarcely as long as the basal two taken to- 

 gether; arista inserted near the tip, scarcely as long as the antenna. 

 The black orbital cilia rather strong, but only reaching down a little 

 way on the sides ; beard whitish, quite abundant. 



Thorax shining green with considerable white pollen on the sides ; 

 scutellum with four large marginal bristles, without hairs on the 

 surface; posterior margin of pleurae pale yellow. First four ab- 

 dominal segments yellow with narrow black hind margins, apical 

 segments black; the abdomen is shining, with very little white pol- 

 len, its hail's black. Hypopygium and its appendages black with 

 extreme base of outer lamellae a very little yellowish, small, some- 

 what triangular. 



All coxae, femora and tibiae yellow, middle coxae a little dark- 

 ened on outer surface; fore coxae with silvery pollen, their anterior 

 surface nearly bare, still there are a few minute yellow hairs at base 

 and large black bristles at tip, which reach to their middle on outer 

 edge. Fore femora with the ^lack hair on the posterior surface 

 longer than that on the remaining portions and with a row or two 

 of minute yellow hairs below; middle femora with only short hair, 

 a few of those on lower surface pale yellow. Hind femora and 

 tibiae scarcely darkened at tip, the former with only short black 

 hair. Bristles on all tibiae rather short. Fore and middle tarsi 

 yellow, blackened towards their tips; hind tarsi wholly black; joints 

 of fore tarsi as 51-18-10-6-6; of middle ones as 63-27-18-8^; those 

 of hind tarsi as 37-37-20-13-10. Calypters yellow with narrow 

 brown tips, their cilia yellow but appearing nearly black in certain 

 lights. Halteres pale yellow. 



Wings grayish; third vein bent backward a little at tip; bend in 

 last section of fourth vein at the length of the crossvein from that 

 vein, fourth vein parallel with third beyond this bend; last section 

 of fifth vein nearly twice as long as the crossvein. 



Described from one male taken at Hull, Quebec, July 23, 1923, by 

 C. H. Curran. 



Type. — In Canadian National Collection. 



25. ARGYRA CALCITRANS Loew 



Argyra calcltrans Loew, Smiths. Misc. Coll., No. 171, p. 130, 1864. 

 A rather abundant eastern form with silvery face, velvety black 

 palpi, third antennal joint only a little shorter than the face, arista 



