NORTH AMERICAN DIPTERA. 287 



claws and jmlvilli elongate, piilvilli fuscous. VVinjis grayish liyalitie, legulse 

 whitish, halteres brownish rnfous. Length of body 7.5 ram. ; of wing 5.5 mm. 



Described from one specimen ; Fort Collins, Col. Bred by Prof. 

 C. P. Gillette from larvje of Eujitchia ribearia. 



IVIasicera dalaiiaruin n. sp. 9- — Eyc^ biownisli, bare; front rather 

 more than one-third width of head, frontal vitta brownish black, nearly one- 

 third width of front, two orbital bristles: vibrissa inserted but little above oj-al 

 margin, the facial ridges ciliate nearly or quite as far up as lowest frontal bristles ; 

 sides of front and sides of face brassy golden pollinose, facial depression and 

 cheeks silvery white; antennsE and arista bbu-kish, first two antennal joints and 

 base of tliird more or less rufous, sometimes only the junction of the two joints, 

 third joint about four times as long as second or somewhat longer; proboscis 

 brownish, palpi pale yellowish with more or less of a rufous tinge, slightly darker 

 at base, thickened at tip; occiput silvery, thickly gray hairy. Thorax silvery 

 white pollinose, with five heavy black vittae, the outer ones interrupted at suture, 

 the median obsolete before suture, humeri and pleurse silvery white; scutellum 

 silvery white pollinose, tawny whitish at apex. Abdomen black, second and 

 third segments entirely silvery white pollinose with a very slight brassy shade 

 in some lights, first segment silvery below and very faintly so above, anal seg- 

 ment wholly pale brassy pollinose, second segment more or less faintly reddish 

 on sides, or hardly perceptibly so; first and second segments with a median mar- 

 ginal pair of macrochaetge and a lateral one, third with a marginal row, anal with 

 more or less irregularly placed marginal and discal ones. Legs black, front 

 femora silvery white on outside, hind tibiae ciliate on outer edge, claws and 

 pulvilli only a little elongate, pulvilli smoky yellowish. Wings nearly hyaline, 

 somewhat grayish, tegulae white; halteres brownish, rufous at base. Length of 

 body 8 — 9.5 mm.; of wing 7 — 8 mm. 



Described from four specimens; two from Ithaca, X. Y., bred by 

 Prof. J. H. Corastock from Datana sp. ; issued June 19th and 21st. 

 One from Ottawa, Can., bred by Mr. W. Hague Harrington from 

 cocoon of Attacus polyphemiis ; issued June 14th. The fourth is a 

 collected specimen from Minnesota (Lugger). This species is strongly 

 marked in the character of the ciliate facial ridges. 



E.vorista t'lidryse n. sp. "J, .-- -Eyes cinnamon-brown, ratlier thickly pu- 

 bescent ; front less than one-third width of head, frontal vitta brown, about one- 

 third width of front; one orbital bristle (on one side, none on other) ; sides of 

 front silvery, with a brassy tinge; face and cheeks silvery white; facial ridges 

 nearly bare, sides of face bare; anteinue blackish, slightly rufous at junction of 

 second and third joints, third joint hardly three times as long as second, arista 

 brownish black ; proboscis brownish, palpi pale yellow, somewhat thickened and 

 curved at tip; occiput silvery, gray hairy. Thorax silvery, with a bluish tinge, 

 with five narrow vitta?, the inner pair well defined, the outer jiair interrupted at 

 suture, the median one obsolete before suture, humeri and pleune silveiy white: 

 scutellum bluish silvery jmllinose, pale ivory at tip. Abdomen shining black, 

 second to fourth segments silvery white pollinose with more or less of a bluish 

 tinge, except posterior bordersand a median vitta shining black, second and third 



TRANS. AM. ENT. SOC. XIX. DKIEMBEK, 1892. 



