178 



Abdomen, two and one half times the length of the thorax, the 

 general facies spatulate, blackish brown, shining, destitute of 

 marking, the specimen appearing somewhat immature. Second 

 segment cylindrical and very slender ; 3rd segment rather short- 

 er ?nd of the same width basally, but rapidly widening apically ; 

 4th segment long, widest at its middle ; 5th segment very short, 

 narrowing considerably at its apex, hairs brownish, quite long, 

 ( specially at the base. Legs testaceous, coxae and trochanters 

 infuscate, the distal halves of the hind femora (except the knees) 

 and tibiae infuscate. Wings hyaline, iridescent, subcostal cell 

 infuscate, a faint transverse infuscation across the dividing point 

 of the 2nd and 3rd longitudinal veins, and extending to the low- 

 er cross vein, also a faint transverse infuscation at the apices 

 of the marginal and submarginal cells, with a central nonfuscate 

 oval spot within this area. Alulae large, scjuamae pale yellow. 

 Halteres yellow. Length 8.25 mm.; wing expanse 14.75 '^I'^i- 

 Female : face retreating as in male, steely, greyish hairs with 

 whitish pubescence extending to sides of epistoma. Vertex 

 steely, destitute of pubescence, with dark hairs. Frons with 

 dark hairs and laterally a narrow band of whitish pubescence ; 

 antennal prominence and central tubercle destitute of pube- 

 scence ; on the outside base of the antenna in one female, is a 

 sub-semi-lunar purplish-violet area, the other specimen showing 

 no trace of this ; back of head more densely pubescent than in 

 the male; antennae similar to male, 3rd joint rather less broadly 

 ovate. Thorax and pleura blackish-aeneous or steely, scutellum 

 aeneous fringed with grayish hairs, the n^esonotum and scutel- 

 lum finely punctate and clothed with short, whitish suberect 

 hairs, with darker hairs on front of thorax. Meso-and sterno- 

 pleura with dense whitish tomentum and hairs, mesopleura with 

 a whitish yellow spot on its posterior margin. Abdomen ; the 

 general facies similar to that of the male Ijut rather stouter, 

 ^ijout three times as long as the thorax, black or steely and 

 finely punctate, with numerous hairs distributed over the sur- 

 face, these hairs are dark dorsally, whitish and more abundant 

 laterally, and at the base are very long ; at the base of the 4th 

 segment are a pair of lateral sub-scalene-triangular, pale yellow 

 patches, clothed with whitish hairs. Wings hyaline, with the 

 following infuscation : The basal, costal and 2nd costal cells, 

 the sub-costal cell (very dark), the l^asal half and apex of the 

 marginal cell, the extreme base and a])ex of the sub-marginal 

 cell, the middle of the upper basal cell, the bases and apical and 



