20 PROCEEDINGS OF THE NATIONAL MUSEUM vod. 60 



and middle tarsi black from the tip of the first joint, hind ones 

 Avholly black. Joints of fore tarsi as 44-14^10^8-10; those of 

 middle ones as 53-22-15-8-8 ; of hind tarsi as 36-29-12-11-9. Ca- 

 lypters yellow with broad black tips and yellowish cilia. Halteres 

 yellow. 



Wings very slightly tinged with brown in front; third vein very 

 gently arched; last section of fourth vein bent a little beyond its 

 basal third, parallel with third beyond the bend ; last section of fifth 

 vein nearly twice as long as the cross "\ein. 



Female. — ^^Vhat is no doubt the female of this species has the face 

 wide, sih'ery white, its suture low down, making the lower part of 

 the face about half as long as wide, with the lower edge a little 

 rounded. Front covered with white pollen. Scutellum with a few 

 minute, black hairs on the disk; abdomen green, sometimes purple, 

 venter j'ellow at base. All coxae black. Fore and middle femora 

 largely black, hind pair yellow with apical third black. Hind tibiae 

 broadly black at tip ; fore tibiae with strong bristles above, none 

 below. 



Described from eight males and three females taken at Hull, Que- 

 bec, June 11-15, by C. H. Curran; two females taken by Doctor 

 Aldrich in South Dakota, and one female at Algonquin, Illinois, 

 May 15, 1894. 



Holotype male and allotype female were taken at Hull, Quebec, 

 and are in the Canadian National Museum. 



ParatyiMS.—Mfile and female. Cat. No. 27042, U.S.N.M. 



15. ARGYRA VELUTINA, new species 



Male. — Length, 6 mm. Face, palpi, front and occiput velvety 

 black, the latter with a white sheen when viewed in certain lights; 

 face moderately narrow, the sides parallel; palpi with conspicuous 

 black hairs. Antennae black; third joint about as long as the basal 

 two taken together, somewhat triangular, pointed at tip; first joint 

 with numerous hairs above; arista apical, as long as the antenna. 

 Orbital cilia and beard wholly black. 



Thorax blackish, somewhat shining, dorsum with thin brown 

 pollen; scutellum with four large marginal bristles and numerous 

 black hairs on its disk. Abdomen and its hairs black; first and sec- 

 ond segments with large yellow spots on each side, which leave only 

 narrow anterior, posterior, and median lines of black; fourth seg- 

 ment with a yellow spot on each side on anterior margin. Hypo- 

 pygium and its appendages black, its outer lamellae and inner 

 appendages somewhat like those of hhnaculata (fig. 14), except that 

 the lamellae are more angulated in the middle and there is a slender 

 somewhat clubbed organ inside of the large ones shown in the 

 figure. 



