73 ENTOMOLOGICAL NEWS. [March, '03 



which give even to the black base a glistening silvery color when viewed 

 from certain directions. 



Thorax quadrate, humeri rectangular, dorsum metallic green, slightly 

 brassy towards the roots of the wings. Acrostichais short and sparse, 

 approximated into a single median series ; the inner row of dorsicen- 

 trals with five moderate bristles, the outer row with four ; a few humeral 

 bristles present: scutellum with two distant long bristles: posterior 

 portion of mesonotum but little depressed : entire pleura slaty with 

 cinereous dust. Abdomen depressed basally, metallic brassy green, en- 

 tirely but rather sparsely covered with short stiff black hairs. Hypopy- 

 gium small, terminal, compressed, concolorous with the remainder of the 

 abdomen, bare. The sixth ventral emits a pair of short, hooked, chi- 

 tinous appendages, between which is a small fleshy hairy process. 



Coxse and legs yellow, the middle and hind coxae somewhat darkened 

 above on the basal half, second joint of middle tarsi white, three outer 

 ioints of middle tarsi black. Legs slender and comparatively long, pro- 

 vided with short dark hairs, middle tibiae somewhat exceeding their 

 femora, one-third longer than their metatarsi ; middle metatarsi nearly 

 as long as the remainder of the tarsus ; middle and hind tibiae provided 

 with a glabrous streak on the outer edge, that of the middle tibiae well- 

 defined by a limiting series of short bristles, both tibiae with a bristle on 

 the basal third of the outer edge : last three joints of the middle tarsi 

 strongly compressed, straight below but each joint arched and outwardly 

 produced on the outer side : remainder of legs simple, ungues and pul- 

 villi minute. 



Halteres pale luteous. Tegular cilia short, sparse, dusky. Wings 

 normal, clear hyaline, strongly iridescent, costa nowhere thickened, 

 third and fourth veins parallel, posterior cross-vein short, perpendicular 

 to the wing-axis, less than one-half the length of the outer portion of 

 the fifth vein, sixth vein faint. 



Three males. Length 1.75 mnL Chester Co., Pennsyl- 

 vania, June 3, 1902 (J. Chester Bradley), Opelousas, Louisiana, 

 and Austin, Texas, May 2, 1902. These specimens from such 

 distant localities were taken in net sweepings, the Texan one 

 in the rank herbage along the Colorado River at the base of 

 Moitnt Bonnell. 



This curious little fly has its nearest relatives in the genus 

 Chrysotus, for which it shows its afiinities by the contiguity of 

 the eyes below the antennae, the width of the vertex, the very 

 short antennae, the small pulvilli and the lack of true bristles 

 on the hypopygium. The depressions of the mesonotum in 

 front of the scutellum is not marked enough to exclude it 

 from this division. Moreover, a number of Chrysotus recently 



