f 8 DIPTERA OP NORTH AMERICA. [PART III. 



The oral opening is cut obliquely upwards ; the but little 

 developed clypeus is tinged with blackish ; the rather broad palpi 

 are usually tinged with yellowish-red towards the tip, sometimes 

 they are altogether ferruginous. The thoracic dorsum has an 

 extended ferruginous-brown spot upon it, formed by the almost 

 complete coalescence of a broad intermediate stripe with two 

 broad lateral stripes, which are abbreviated in front. The meta- 

 thorax and the greater part of the pleurae are often tinged with 

 dark pitch-brown. The coloring of the abdomen on the first two 

 segments, and also at the basis and along the middle of the fol- 

 lowing ones, often becomes pitch-brown or brownish-black, this 

 is especially often the case in male specimens. The first 

 abdominal segment is very much elongated in both sexes; in the 

 male it is not quite* as long as the three remaining segments 

 taken together ; in the female, the last four segments are so 

 much shortened, that, taken together, they are much shorter than 

 the first joint. The capsule-shaped ovipositor is conical, bent 

 downward towards its end. The feet are ochre-yellowish, but 

 the femora brown up to the tip ; the tibiae likewise are more or 

 less infuscated, except the basis and the extreme tip. Wings 

 large, the greater portion of them is uniformly tinged with 

 brown, which color covers the costal, marginal, submarginal, the 

 first posterior and the discal cells, also the basal cells, with the 

 exception of a pale stripe in the anal cell, moreover, this color 

 forms a broad border along the inner portion of the second poste- 

 rior cell, and a narrower one along the anterior margin of the 

 third posterior cell; within this brown coloring some specimens 

 do not show any paler spots, the majority, however, show, in the 

 submarginal cell, a little beyond the small crossvein, a rounded 

 or oval, almost hyaline spot, which attains sometimes a consider- 

 able size ; moreover, a great many specimens show some scattered, 

 small, hyaline dots, not far from the end of the same cell, of the 

 first posterior and of the discal cells ; the posterior limit of the 

 brown coloring has a whitish-hyaline border, which, following the 

 course of that limit, forms a steep curve in the second posterior 

 cell ; in the third posterior cell it takes the shape of a gently 

 arched longitudinal stripe ; within this border, the surface of the 

 wing has a uniform brownish coloring, which is perceptibly more 

 intense only in the region of the axillary incision; in some cases, 

 near the posterior side of the sixth longitudinal vein, a little 



