10 PROCEEDINGS OF THE ITATIONAL MUSEUM vol.74 



ihan the diameter of the joint; third joint small, rounded; arista 

 dorsal, scarcely as long as the width of the head. 



Thorax green, posterior half of dorsum and the scutellum with blue 

 reflections; scutellum with two pair of large bristles; bristles of 

 thorax and abdomen short ; first abdominal segment violet on posterior 

 portion, the other segments green with blue reflections, except the 

 fourth, which is green with bronze reflections, last segment mostly 

 blue posteriorly ; second segment with a black crossband, the follow- 

 ing ones black at base, the black becoming wider on each succeeding 

 segment. Hypopygium (fig, 17) black with brown appendages, the 

 outer appendages with four bristles on inner edge and many fine 

 haii^ on outer edge. 



Coxae and femora black; fore coxae with moderately long white 

 hair and two black bristles ; all femora with long pale hairs below ; 

 fore and middle tibiae dark yellow, posterior pair yellowish brown ; 

 fore tibiae with a few slender bristles on Jower posterior edge, four of 

 which are quite long; middle and hind tibiae with one small bristle 

 near the base ; tarsi black ; middle basitarsi with short, clavate hairs 

 below, which extend up the tibiae and are shorter than the hairs on 

 upper surface; hind tarsi with last three joints slightly flattened and 

 widened ; joints of fore tarsi as 97-33-26-18-9 ; those of middle ones 

 as 135-30-26-11-6; joints of posterior pair as 110-28-20-17-10. 

 Calypters, their cilia and the halteres black. 



Wings grayish, with the usual crossbancls large, united along the 

 costa as far as the third vein and also narrowly along the fourth 

 vein, leaving a nearly square hyaline spot between third and fourth 

 veins ; the bands narrowly reach the hind margin of the wing at tip 

 of fifth vein and also at tip of fourth vein, along the costa the brown 

 reaches from the tip of first vein to tip of the fork of fourth vein 

 and follows this fork to wing margin; from tip of first vein to 

 base of wing and from the costa to third vein the wing is tinged with 

 yellow; upper bend of fork of fourth vein with a stump vein, this 

 fork bent backward so as to form a 50° angle with fourth vein; 

 cross vein only slightly oblique, almost at right angles to fourth 

 vein; last section of fifth vein 14, cross vein 44, fourth vein from 

 cross vein to fork 75, from fork to wing margin twenty-six fiftieths 

 of a millimeter long ; first vein reaching about two-fifths of the length 

 of the wing. 



FeTnale. — Length 4 mm. Agrees with the male in the color of 

 the face, front, proboscis and palpi; in the form of antennae, its 

 bristles and arista; and in the venation of wings and color of legs 

 and feet, except that the tibiae are all yellow. The joints of fore 

 tarsi are as 90-18-12-8-5; those of middle ones as 82-20-18-7-5; 

 those of posterior pair as 62-25-15-9-6; middle basitarsi without 

 clavate bristles, fore basitarsi with a few little bristles below. 



