﻿102 Journal New York Ent. Soc. [Voi. in. 



^ — Same as the f except that the front pulvilli are as long as the last tarsal 

 joint. Hypopygium projecting one-third the length of the fourth abdominal segment 

 beyond the latter. Length 6 to 8 mm. 



Northern Illinois (Dr. W. A. Nason), and Dist. Columbia in July, 

 taken by the writer. One male and two females. 



Opsidia, gen. nov. 



Head swollen, frontal bristles continuous from the occiput, in single rows, 

 descending to base of second antenna! joint, two backwardly curving macrochaetK on 

 vertex outside of each row, the anterior ones slightly in advance of the anterior 

 ocellus ; anterior ocellar bristles curving obliquely forward, sides of front and of face 

 covered with short bristly hairs, the latter also bearing a row of short macrochcetje 

 outside of the ridges which are almost parallel; face in profile straight, greatly 

 retreating below, the sides at narrowest part each as wide as the median depression ; 

 vibrissse inserted almost on the oral margin, two or three short bristles above each ; 

 antennae six-sevenths as long as the face, the third joint five times as long as the second; 

 arista bare, the penultimate joint not longer than broad; eyes bare; cheeks one- 

 fourth as wide as the eye-height ; proboscis rather slender, the portion beyond the 

 basal articulation less than half as long as height of head ; palpi well-developed, 

 clavate. Third vein bearing four bristles at the base, the others bare ; hind cross- 

 vein near last third of distance between the small and the bend, the latter with a 

 long appendage ; posterior end of hind crossvein nearly midway between the small 

 and tip of fifth ; apical cell open, ending midway between the second vein and the 

 extreme tip of wing. Type, the following species : 



Opsidia gonioides, sp. nov. 



9 — Black, the first two antennal joints largely, and the palpi, yellow. Front 

 at vertex twice as wide as either eye, two pairs of orbital bristles, arista thickened 

 on the basal five-sixths. Thorax gray pollinose, marked with four black vittK ; three 

 postsutural and two sternopleural macrochcet?e, scutellum bearing three long margi- 

 nal pairs. Abdomen gray pollinose, second segment with a marginal pair, the third 

 and fourth each with a marginal row of short macrochcette. Wings hyaline, costal 

 spine minute, calypteres white. Front claws and pulvilli scarcely half as long as the 

 last tarsal joint. Length g mm. 



Atlantic City, N. J., July 15, 1894 (C. W. Johnson). A single 

 specimen. 



Metaplagia, gen. nov. 



Frontal bristles in single rows, descending to base of the third antennal joint, 

 anterior ocellar bristles directed obliquely forward, face in profile slightly convex, 

 greatly retreating below, the sides covered with short bristly hairs, each side at nar- 

 rowest point nearly half as wide as the median depression, ridges widely diverging 

 below, vibrissse inserted close to the oral margin, three or four bristles above each , 

 antennre five-sixths as long as the face, the third joint six times as long as the second ; 

 arista bare, the penultimate joint not longer than broad ; eyes bare ; cheeks nearly 

 one-third as broad as the eye-height ; proboscis somewhat fleshy, the portion beyond 



