1 8 PSYCHE [Februan- 



mm., a specimen from N. Illinois measures only 3 mm. Wiedemann's specimen 

 came from Georgia. The larva described and figured by Mr. Emerton were taken 

 at VValtham, Mass., in the spring of 1887, from the web oi Aniaurobius sylvestris, 

 but he was unable to raise the adult fly. In May, 1889, he again visited the same 

 locality and found several specimens in abandoned cobwebs and from a pupa suc- 

 ceeded in obtaining a fly of which an excellent figure is given, and I agree with 

 Dr. Williston in referring it to Acrocera fasciata Wied. 



Oncodes albiventris sp. nov. 



Head black, antennae yellow. Thorax and scutellum black, shining, and 

 covered with erect yellowish pile. Abdomen white, and marked with black as 

 follows: — first segment with a large dorsal spot, the other segments with a short 

 transverse basal band, which extends only over the dorsal third, and from which 

 projects posteriorly, except on the last segment, a short dorsal triangle ; third and 

 fourth segments with a small spot on each side of the dorsal line near the posterior 

 margin ; all the segments with a small lateral triangle, most prominent on the last 

 three segments; venter white, with a single transverse band on the last segment: 

 the entire abdomen sparsely covered with whitish hairs. Legs yellow, coxae and 

 basal half of the femora black, tips of the tarsi brownish. Wings hyaline, veins- 

 light yellow, tegulae whitish with a narrow hyaline margin. Length, 5 mm. 



One specimen, Toronto, Ontario, Canada, July 18, 1896. 



Argyra aldrichi sp. nov. 



$ . Face, front and vertex silvery white, the latter about double the width of 

 the face ; cilia of the upper orbits black, and of the lateral and inferior orbits white. 

 Antennae black, third joint slightly but evenly tapering to a blunt point, insertion 

 of the arista almost apical. Thorax and scutellum shining green, humeri, pleurae 

 and metanotum thickly covered with a whitish bloom. Abdomen slender, largely 

 yellow, with black hairs, segments 2 lo 4, narrowly margined with black, segments 

 5 and 6 black, with a white basal band ; hypopygium black, the base of the small 

 lamellae yellow. Coxae and legs light yellow, with delicate black hairs and bristles, 

 hind tarsi black, outer portion of the front and middle tarsi brownish. Wing tinged 

 with yellowish-gray, end of the fourth longitudinal vein but slightly inflected for- 

 ward. Length, 5 mm. 



One specimen, woods at Goose Neck, Shrewsbury Ri\cr, near Long Branch, 

 N. J., June 1 1, 1902. 



