164 DIPTERA OP NORTH AMERICA. [PART III. 



Bluish-black, with a dirty-yellow basis of the abdomen ; wings with four 

 complete black crossbands, the last two of which are connected by a 

 narrow stripe at the costa. Long. corp. 0.12 — 0.14; long. al. 0.12 — 

 0.14. 



Stn. Euxesta abdominalis Loew, Berl. Ent. Zeitschr. XI, p. 307, Tab. II, f. 15. 



Head brick-red or brownish-brickred; the small stripes run- 

 ning down from the vertex along the orbits of the eyes and the 

 surroundings of the ocelli, are steel-blue, shining ; almost the 

 whole occiput is black, with a grayish-white bloom. Front 

 rather narrow ; rather dense and conspicuously coarse hairs upon 

 the lateral borders, which are covered with white pollen ; the 

 hairs upon the remainder of the surface are very scarce. Antennae 

 brownish-brickred, or brick-red ; in the latter case the rounded- 

 oval last joint is more or less infuscated towards its end. The 

 face is moderately excavated, usually for the most part with a 

 shining steel-blue reflection ; its white bloom is very thin along 

 the edge of the mouth. Olypeus only moderately projecting, with 

 a more or less distinct steel-blue reflection on the sides. Thorax 

 of a shining, blackish-steelblue color, which usually verges some- 

 what on green upon its dorsum. Scutellum and metathorax 

 still darker greenish-black, not pollinose. Abdomen more greenish- 

 black than bluish-, or metallic-black, at the basis always dirty 

 clay-yellow. The coloring of the first segment of the flattened 

 ovipositor is the same as that of the abdomen, or a more purely 

 black one. Fore coxaa, at the tip at least, brownish-brickred, 

 with white pollen; femora black, more or less metalescent, with 

 a brownish-brickred tip ; tibias blackish-brown, only the extreme 

 tip reddish-brown ; tarsi reddish-brown at the root, otherwise 

 blackish-brown. Halteres whitish or yellowish. Wings with 

 four not abbreviated black crossbands. The first is broader than 

 in the two preceding species, but is likewise placed upon and 

 immediately beyond the humeral crossvein, and extends as far as 

 the basis of the anal cell. The second band begins at the ante- 

 rior margin with the black tip of the costal cell and the black 

 stigma; it is rather broad and gradually expands in approaching 

 the posterior margin so that, at this place, its breadth exceeds 

 considerably that of the other bands ; the small crossvein lies 

 exactly upon its outer margin. The third band likewise, which 

 runs over the posterior crossvein, has a considerable breadth and 

 a very perpendicular position. The fourth band runs along the 



