154 DIPTERA OP NORTH AMERICA. [PART III. 



The general appearance of the species belonging here is not 

 unlike Trypeta. Legs short. The coloring is metallic ; the 

 black picture of the wings consists either of some large spots 

 along the anterior margin or of crossbands. The plastic charac- 

 ters of the species do not afford any features for their satisfactory 

 distribution into groups ; for this reason the following three 

 groups are merely based upon the picture of the wings. 



1st Group. Wings with spots along the anterior margin. 



1. E. spoliata LOEW. (Tab. IX, f. 7.) Viridis, capite pedibusquo 

 flavis, extreme fetnorum apice fusco, tibiis anticis fere totis, reliquarum 

 apice tarsisque inde ab articuli primi apice nigris, alarum stigruate 

 iiigro, macula subapicali nigricante. 



Green, head and feet yellow, the extreme tip of the femora brown, fore 

 tibia almost entirely, the tips of the four posterior tibiae and the tarsi, 

 from the tip of the first joint, black; wings with a black stigma and 

 with a blackish spot immediately before the tip. Long. corp. 0.12; 

 long. al. 0.120.13. 



SYS. Euxesta spoliata LOEW, Berl. Ent. Zeitschr. XI, p. 298, Tab. II, f. 7. 



Metallic-green, shining ; the color of the scutellum and of the 

 anterior segments of the abdomen is somewhat more bluish-green. 

 Head yellow ; the upper part of the occiput is blackish-green ; 

 front ferruginous-yellow; the swellings descending from the 

 vertex along the orbit of the eyes and the immediate vicinity of 

 the ocelli is metallic greenish-blue. Antennae of a dark ferrugi- 

 nous-yellow ; third joint round. Face shorter than in most of 

 the other species. Clypeus yellow, protruding considerably 

 beyond the anterior border of the mouth, although projecting but 

 little in profile. Feet yellow ; all the femora distinctly infus- 

 cated at the extreme tip ; fore tibiae rather stout, brownish-black, 

 before the middle with an incomplete yellow ring ; the interme- 

 diate tibiae are blackened at the extreme tip only, the hind tibiae 

 also at the tip, but to a greater extent; the first joint of the hind 

 tarsi is yellow, except the tip; the following joints are black (the 

 intermediate and hind tarsi are wanting in the described speci- 

 men). Halteres yellowish. Wings pure hyaline with pale clay- 

 yellow veins ; extreme root of wings pale yellowish ; the last 

 section of the fourth longitudinal vein is but very slightly 

 arcuated, but converges in its whole length towards the third vein, 

 its tip thus approaching very near this vein ; stigma blackened ; 



