74 BULLETIN 31, UNITED STATES NATIONAL MUSEUM. 



orauge colored, or light yellowish, except across the disk, where it is 

 blackish. Scutelluin obscure j'ellowish, translucent, the sides and base 

 broadly bluish black. Abdomen elongate, scarcely broader than the 

 thorax, the sides nearly parallel to the end of the tliird segment ; opaque 

 black; first segment, the hind border of the fourth segment, dilated in 

 the middle, and the fifth segment wholly, shining greenish metallic: 

 second segment witli large sjiots; in the male rounded on the inner ends, 

 and only touching the front border on the outer part, somewhat atten- 

 uated before reaching the lateral margin ; in the female longer, nearly 

 square, attaining the front border for nearly their whole length ; third 

 and fourth segments before their middle with a straight, narrow cross- 

 band, interrupted in tbe middle for about their own width. Legs black, 

 terminal half of front and middle femora, front and middle tibi;e, except 

 brownish rings beyond the middle, yellow. Wings hj aline, stigma brown. 



Syrphus pauxillus, n. sp. 



Habitat. — New Mexico ! 



$ . Length, 1"^^. Eyes pilose. Face j^ellow, a broad median stripe, 

 not reaching the antennae, and cheeks, shining black ; in profile the face 

 is projecting, the distance from antenuai to tip of tubercle distinctly 

 greater than from the antennae to ocelli. Antennae black ; the third 

 joint brown, on the under side near the base reddish. Dorsum of 

 thorax shining bluish-black, with light yellowish pile. Scutellum only 

 faintly yellowish. Abdomen broadly oval, shining black, witli three 

 pairs of yellow spots, which are narrow and rather narrowly separated, 

 all of them narrowly, but distinctly separated from tbe lateral nmrgin; 

 first pair straight, transverse; the second and third pairs oblique, arcu- 

 ate, their anterior end nearly touching the front margin the posterior- 

 end near the middle of the segment; the spots are concave in fi'ont 

 and convex behind, of nearly equal width ; fourth segment with a nar- 

 row hind margin ; fifth segment with a small spot on the front angles, 

 and a narrow margin behind, yellow. Legs yellow, femora black at the 

 base (the hind legs wanting). Wings hyaline, stigma brownish. 



One specimen (G. F. Gaumer). 



Syrphus sodalis, n. sp. 

 Hahitat. — Colorado ! 



9 . Length, 10'"™. Eyes pilose. Face yellow, lightly pollinose on 

 the sides, a small brownish spot on the tubercle; oral margin and the 

 cheeks metallic black. Antennae black, third joint reddish below near 

 the base. Front black, broadly grayish pollinose across the middle, 

 leaving the vertex and a small spot below more metallic black ; a slen- 

 der arch, immediately above the antennae, yellow ; i)ile of front black. 

 Lateral posterior orbits thickly grayish pollinose. Dorsum of thorax 

 deep shining green, with light yellow ])ile. Scutellum light yellowish, 

 subtranslucent. Abdomen broadly oval, shining black ; the cross- 

 bands yellow, interrupted. The first pair of spots is more broadly sep- 



