52 Annals Entomological Society of America [Vol. VI, 



and post-vertical bristles yellowish. Dorsum of the thorax black, and 

 thickly covered with white pollen, which generally forms two obscure 

 narrow stripes; pleurae black, covered with white pollen; prothorax, 

 humeri, and metathoracic epimera yellowish white; scutellum pale 

 yellow, black at base; metanotum black. Abdomen yellow, with the 

 first seg-ment and the posterior edges of the second, third, and fourth, 

 and the venter paler; second, third, and fourth segments with wide 

 black bands at base, that on the second narrowed laterally; fifth seg- 

 ment yellow with a polished black sheath on the venter; third segment 

 with a black transverse line on the venter, this line near the middle of 

 the segment and fringed with long whitish hairs; hairs of the abdomen 

 mostly pale; the long bristles on the hind margin of the first segment 

 black; hypopygium rather large, basal half yellow, the remaining part 

 black and polished. Legs pale yellow; front cox^e with delicate pale 

 hairs on the front side, and black bristles near the tip; middle coxas 

 with black hairs and bristles; middle trochanters with a black bristle 

 below, and a black spot above ; front metatarsi a little shorter than their 

 tibiae, the third joint as long as the fourth and fifth together, fourth 

 nearly twice as long as fifth, third a little enlarged, snow white, and 

 with white hairs; fourth and fifth black, flattened, and fringed with 

 black hairs; middle metatarsi about the length of their tibice; second 

 joint of hind tarsi a little longer than the first. Wings hyaline; tips of 

 the third and fourth veins not very close together. 



Female: Differs from the male in having the face quite wide, the 

 front tarsi plane, middle trochanters without the black spot, fifth seg- 

 ment of the abdomen with a black band, wings tinted with yellowish 

 along the front and the dorsum of the thorax more greenish. 



Described from twelve males and twelve females, from 

 N. Y., Pa., and Mich. I have taken sixteen specimens at 

 East Aurora, Erie Co., N. Y., from June 11-15. Mr. Nathan 

 Banks took one at Sea ClifT, N. Y. Prof. J. M. iVldrich sent me 

 specimens from Battle Creek, Mich., and Pa. 



24 Neurigona lienosa Wheeler. 



Neurigona lienosa Wheeler, Proc. Cal. Acad. Sci. 3d series, 2, p. 72, 1899. 



Length 43<4 mm., wing 3^^ mm. 



"Proboscis yellow; palpi and face yellow, covered with silvery 

 white dust, the latter of the usual breadth for a female; antennse yellow, 

 the small third joint with a blunt point, and covered with dark pubes- 

 cence; arista distinctly pubescent; front and occiput metallic green, 

 thickly covered with white dust; postocular cilia snow white. Thorax 

 dull metallic green, the ground color almost hidden under a thick coat- 

 ing of brown dust; dorsal bristles prominent along the interior border 

 of the thorax; scutellum slightly lighter metallic green, but also with a 

 covering of dust, the scutellum bears two strong mesial, and two weak 

 lateral bristles; first abdominal segment dark brown, succeeding seg- 

 ments black, dusted with white, posterior edges of second, third, and 

 fourth segments, and venter yellow, ovipositor yellow at the base, tip 



