132 THE CANADIAN ENTOMOLOGIST, 



Straight. Antennae short, third joint very broad ; arista basal pilose. Eyes 

 long pilose, widely contiguous in the male. Femora and coxiw simple, 

 without spines or tubercles. Face very broad, the diverging eye margins 

 form an angle of at least 80 degrees ; the apex is just above the antennae, 

 swollen. (In Sericomyia and Ardophila the eye margins are almost 

 parallel.) 



Type of genus, Pyritis viontlgena, n. sp., North America. 

 This genus falls naturally into Williston's tribe Sericomyini, which 

 contains the genera Sericomyia and Ardophila. From both of these it 

 may be easily separated by the peculiar formation of the face and the 

 pilose eyes. There is one genus in the Volucellini, Phalacromyia, which 

 has the marginal cell open. From this it differs in having the outline of 

 the face rounded and not produced conically downward, and also in 

 having the third antennal joint circular and not elongate. The distinctive 

 character of this genus, however, is the remarkably wide and swollen face. 

 20. Pyritis inontigena., n. sp. Plate V., Fig. i, a, b. 



Male. — Black opaque, thickly pilose. Eyes long, dense black 

 pilose. Face and front shining, sparsely clothed with yellowish pile, 

 intermixed with black. F'ront very distinctly sulcate. Face swollen, 

 perpendicular to below the eye margins, thence receding and very slightly 

 concave to the oral margin, Antennee black, third joint reddish, broader 

 than long ; arista long, loose pilose on the upper side, much less so below. 

 Thorax long, dense, whitish-yellow pilose, the margins and three narrow 

 indistinct central lines shining. Scutellum shining, dull testaceous. 

 Abdomen covered with long, erect, dark yellovv pile ; first and second 

 segments opaque; ihiri with a shining band on the anterior margin, 

 becoming more opaque towards the middle, where it is broadly interrupted ; 

 fourth segment entirely shining, except a subopaque band widely inter- 

 rupted in the middle. Legs entirely black ; long yellowish pilose 

 intermixed with black on the anterior pair. Posterior pair somewhat 

 arcuate. Wings subhyaline, with black clouds on the cross veins, and at 

 the furcation of the second and third veins. Third vein perfectly 

 straight. L., 12 mm. 



One specimen : Moscow, Idaho; coll. Prof. J. M. Aldrich. 

 21. i^r/V/^rZ/j v1/^4w//V,Wiedemann, Ausseurop-Zweiflg.— Ins., ii., 177, 35, 

 talj. X. b.,' f., 15 (1830); Williston, Proc. Am. Phil. Soc, xx., 

 322 (1882); ibid Syn. N. A. Syrphidi«, p. 165 (1886); ibid Trans. 

 Am. Ent. Soc, xiii., 318 (1886); F. Lynch-Arribalzaga, Anales, 

 (1. 1., Soc. Cien. Argentina, xxxiv., p. 38 (1892). 



