DESCRIPTION OF THE SPECIES. 273 



dorsum shows traces of a pair of bristles Scutellum but little 

 convex, provided with four bristles. Metathorax blackish with. 

 a grayish-yellow pollen. The color of the pleurae, in the described 

 specimen, does not differ much from that of the remainder of the 

 body ; it seems, nevertheless, that, in more fully colored speci- 

 mens, a considerable portion of the pleurae may be blackish ; they 

 are thickly clothed with a clay-yellow pollen ; the pile and the 

 bristles upon them, like those on thorax and scutellum, are yel- 

 lowish-brown. The abdomen shows a trace of four dark longitu- 

 dinal stripes, formed by very much faded blackish spots ; the pile 

 upon it is somewhat shorter and rather blackish upon the anterior 

 half of the single segments ; upon their posterior half, it is some- 

 what longer and almost whitish; yet the long bristles on the 

 posterior border of the last segment are blackish-brown. The 

 flat ovipositor, which in the allied T. latipennis Wied. equals 

 the last four abdominal segments in length, is but a little longer 

 here than the last two segments taken together; it is of the same 

 color with the abdomen, somewhat blackened at the root and tip, 

 and beset everywhere with short blackish pile. Feet brownish- 

 ochre yellow. Wings very broad, very like those of T. latipennis 

 in outline, venation, and picture; proportionally, however, they 

 are not quite as broad and not quite as convex on the anterior 

 margin ; upon the apical third of the wing there are three cross- 

 bands, connected anteriorly and separated by narrow, hyaline 

 intervals, beginning at the posterior margin ; the first band is 

 contiguous, on its outer side, to the posterior crossvein, and 

 expands across it near its posterior end ; the second runs across 

 the middle of the second posterior cell, the third borders the apex 

 of the wing. The remaining portion of the surface of the wing, 

 beyond the second longitudinal vein, has a somewhat darker 

 brownish tinge, and is covered with a multitude of small hyaline 

 drops, which partly coalesce into longitudinal rows, and in some 

 places, as at both ends of the small crossvein and here and there 

 on the longitudinal veins, leave unbroken brown spots. Upon 

 the posterior margin, there is a broad brown border, bearing a 

 few larger, but not very well-defined drops, which are also less 

 hyaline than those of the centre of the wing; on the posterior 

 angle of the wing the border is somewhat faint. The brownish- 

 black stigma coalesces with a spot of the same color immediately 

 behind it, which spot crosses but little the second longitudinal 

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