286 AMERICAN DIPTERA. 



thorax, and abont as wide, broadest at its second segment, tben tapering slightly 

 to a narrow fourth segment; the last segment ofjj blunt and very much enlarged 

 ventrally, and of both sexes minutely granular, giving a shining but not glossy 

 appearance. The ventral segments brown to blackish green. First section of 

 ovipositor shining green, flat, hairy below (the remainder wanting in this speci- 

 men). 



Femora thickened, greenish brown at joints, with no prominent bristles; coxae, 

 tibiae and tarsi dark brown. 



Wings with costal cell and stigma brown, one large spot at the apex of margi- 

 nal, and submarginal cells diflTusing into the first posterior cell to the fourth veiii) 

 its posterior border perpendicular; first vein bare; third vein straight; fourth 

 vein converging towards the third at the apex, leaving the opening about as wide 

 as the small cross-vein, the last section twice as long as the preceding section ; 

 fifth vein extending to the margin , anal cell with a straight pointed lobe; cross- 

 veins perpendicular, the anterior one just beyond the middle of discal cell. 

 Length % , 4 mm. ; 9 > 5-5i mm. 



Ysleta, Texas (Viereck aud Reliii). Type coll. Acad. Nat. Sci. 

 Phila., one % aud one 9 • 



This species seems to be a distinct departure from the typical 

 Acrosticta by its smooth front. The clypeus is distinct but not pro- 

 jecting. These characters alone will separate it from the other spe- 

 cies of this genus. Loew does not refer to the minute granulation 

 of the abdomen, which is very distinct in this species, giving it a 

 semi glossy appearance. With more material and comparisons with 

 others of this genus, this species may introduce a new genus. For 

 this reason I include generic characters in the above description. 



Euxesta minor sp. nov. (PI. VI, fig. 12). 



Front rufous, narrower towards antennae, slightly projecting, flat, with few 

 scattered minute bristles; vertex shining greenish black, as is the occellar region 

 and each side along the orbit to the middle of front; two frontal bristles. Face 

 more yellow, pollinose in the excavations and along the orbits. Cheeks yellow. 

 Clypeus yellow, projecting as far as front. Occiput black above, pollinose. An- 

 tennae rufous; third joint round, brownish on anterior edge ; arista black. Palpi 

 yellow. Proboscis brownish. 



Thorax green, with coppery reflections, slightly pollinose above; bristles nor- 

 mal ; the pleurae like-colored. Scutellum couvexed, of a metallic coppery color. 

 Squamulae and halteres white. 



Abdomen shining, brownish, posterior margins of third and all of fourth seg- 

 ments yellow. First section of ovipositor brownish, as wide as fourth segment, 

 and about two-thirds as long as the abdomen. 



Legs translucent yellow, with posterior tibite and the apical joints of all tarsi, 

 brownish. 



Wings with a black spot at the apex of marginal cell and extending to the 

 fourth vein ; another on the stigma extending to aud reaching the fourth vein . 

 the base of costal cell brownish ; third and fourth veins nearly parallel at apex; 

 the fifth vein reaches the margin. Length 2i mm over all. 



