264 BUULETIN 116, UNITED STATES NATIONAL MUSEUM. 



Dorsum of thorax shining green with shght bronze reflections; 

 pleurae dulled with white pollen. Abdomen green; the white pollen 

 on its sides abundant. Hypopygium (fig. 193) black; its lamellae 

 large and thick, smooth, deeply cleft so as to appear like four large 

 smooth lamellae, each part oval, still slightly but obtusely pointed 

 at tip, the upper or inner division is slightly darkened and bears two 

 or three black bristles and a few pale hairs at tip. 



Fore coxae yellow with a black spot at base on outer side, their 

 front surface covered with little black hairs, except at upper outer 

 corner where there are only delicate yellow hairs. Middle and hind 

 coxae black with yellow tips. Femora and tibiae yellow. Middle 

 and hind femora each with one preapical bristle, the latter nearly 

 glabrous below, but with a few minute pale hairs on lower inner 

 edge. Middle basitarsi with one large bristle above near their middle 

 and another nearly as large on anterior surface near the one on top ; 

 middle tibiae with four or five bristles below. Posterior tibiae slightly 

 thickened; the usual glabrous stripe on upper surface broad but not 

 conspicuous; inner surface with a small elongated glabrous spot near 

 the middle. Fore tarsi one and one- third times as long as their 

 tibiae; first three joints slender, yellow, still the third is a little 

 widened and whitish; first joint about as long as the three following 

 taken together, second scarcely half as long as first, last three joints 

 of nearly equal length, each a little more than half as long as the sec- 

 ond; fourth and fifth black, slightly flattened and fringed on both 

 sides with black hairs so as to form an elliptical tip to the tarsi (as in 

 scoparius). Middle tarsi a little longer than their tibiae, blackened 

 from the tip of the first joint. Hind tarsi black from the tip of the 

 first joint. Calypters and halteres yellow, the former with black oilia. 



Wings grayish or yellowish gray; veins yellowish, becoming brown 

 on apical portion of the wing; costa yellow on inner edge, not at all 

 enlarged at tip of first vein; last section of fourth vein bent before its 

 middle; hind margin of wing rather deeply notched at tip of fifth vein; 

 anal angle prominent. 



Female. — Face wide, white; front and orbital cilia as in the male; 

 middle basitarsi with one large bristle above, but they seem to be 

 without the bristle on the front surface that is found in the male ; fore 

 tarsi plain, with the last two or three joints black, fourth and fifth of 

 about equal length; wings as in the male, except that the notch in 

 hind margin at tip of fifth vein is smaller. 



Redescribed from the single pair of type specimens; also 1 male 

 from Massachusetts; 1 male taken at Ramsey, New Jersey, June 16; 

 1 male taken at Boston, Erie County, New York, July 10, 1010; and 

 several males and females taken on Staten Island, New York, Juh 

 17, by W. T. Davis. [I took two males at Blue Ridge Summit, Peim- 

 sylvania, August 8, 1920.— J. M. A.] 



