DESCRIPTION OF THE SPECIES. 217 



mens, runs from the posterior corner of the thoracic dorsum to 

 the transverse suture ; in some specimens the posterior border of 

 the thoracic dorsum also shows a trace of a lighter coloring; the 

 dense, but very short, pubescence of the thoracic dorsum is yel- 

 lowish ; the macrochaetae upon it are black ; there are seven of 

 them on each side, viz. : three on each side, in a row beginning 

 at the humerus and ending before the root of the wings ; three 

 others a little farther from the lateral margin in a row beginning 

 at the transverse suture and ending in the vicinity of the poste- 

 rior corner ; finally, a single bristle between the last one of this 

 second row and the lateral corner of the scutellum ; there are 

 only two pairs of macrochastae on the longitudinally middle por- 

 tion of the thoracic dorsum, not far from the posterior margin ; 

 the bristles of the posterior pair are at a moderate distance from 

 each other, the distance between those of the anterior pair is 

 perhaps three times greater. All the bristles and bristle-like 

 hairs upon the pleurae and the pectus are black ; the short pubes- 

 cence upon the upper half of the pleurae is blackish, on the lower 

 half it is pale-yellow. Scutellum comparatively large, flat, with 

 a short, yellowish pubescence on the upper side, and with six 

 strong macrochaetae along the edge ; in life, the scutellum is pro- 

 bably altogether whitish-yellow or sulphur-yellow, while in dry 

 specimens, this coloring is perceptible along the borders only. 

 The abdomen has brownish-black bands, which do not reach the 

 posterior margin of the segments ; these bands occur upon the 

 second, third, and fourth segments; they are often less developed 

 upon the anterior segments than upon the posterior ones, and 

 here sometimes interrupted ; upon the rather large last abdominal 

 segment of the male the brownish-black crossband is especially 

 broad and more or less emarginate on its posterior side ; my 

 only female specimen has on the first abdominal segment an 

 incompletely developed brownish-black band, situate before the 

 posterior margin. The pile upon the abdomen is black; pale- 

 yellowish on the upper side of the first segment and sometimes 

 also on the basis of the second ; however, all the pile upon the 

 abdomen assumes, in a reflected light, and especially in specimens 

 of a lighter coloring, a brownish-yellow, almost a ferruginous- 

 yellow tinge (with the exception of the stronger, bristle-like 

 hairs). The hypopygium is brownish-black ; the brown ovipositor 

 is conical, not flattened at all, perceptibly longer than the last 



