DESCRIPTION OP THE SPECIES. 317 



thorax, are blackish. Abdomen narrow, but little more gray than the 

 upper side of the thorax, without any rows of dark spots, but on_ 

 each side of the second segment with a but little apparent yellow spot ; 

 the short pile as well as the longer hairs upon the posterior margin of the 

 last segment are yellowish. The flat, shining black ovipositor is as long 

 as the whole abdomen, and beset with dark pile. The feet are slender 

 and yellow, as well as the coxae. Wings rather hyaline, with a brownish- 

 black very continuous reticulation ; the root of the wings is not distinctly 

 spotted as far as the end of the small basal cells, but somewhat dusky ; 

 upon the middle of the costal cell there is a blackish-brown crossline ; the 

 Btigma does not contain any hyaline drop, but its inner basal end is very 

 slightly tinged with yellow ; immediately beyond the stigma there are, 

 near the anterior margin, two drop-like hyaline spots ; each of them has 

 a small hyaline drop under it, below the second longitudinal vein ; the 

 second one is smaller ; before the end of the second vein there is no 

 hyaline drop; near the tip of the wing the apex shows the usual five rays, 

 which have a considerable breadth, and the last of which is connected by 

 a bridge with the remaining brownish-black coloring, which thus isolates 

 the inner end of the hyaline interval in the shape of a drop; the anterior 

 side of the fourth vein shows two conspicuous spots, one immediately 

 before, the other not far beyond, the small crossvein ; in the discal cell 

 there are three hyaline drops along the fifth vein, the middle one being 

 the largest and lying almost under the small crossvein ; above the last of 

 these drops there is sometimes one little drop more ; the extreme basis of 

 the discal cell also shows an indistinct, sometimes double, little drop ; the 

 third posterior cell contains but a few large drops, which are partly coal- 

 escent in couples ; the posterior corner of the wing is likewise guttate, 

 but the drops are much less apparent here, owing to the pale ground colon 

 The small crossvein is hardly half as distant from the end of the discal 

 cell as from the basis ; the third longitudinal vein is not bristly. 

 Hub. Brazil (collect, v. Winthem). 



56. T. mexicana WIED. . (Tab. X, f. 28.) Luteo-cinerea, abdo- 

 mine nigro, adversus basim interdum sordide luteo, capite pedibusque 

 flavis ; setse scutelli duse ; alarum pictura nigra in apice radiata, radiis 

 tamen in marginem posticum excurrentibus minus explicatis et minus 

 liberis, prope marginem posticum confertius, in disco rarissime guttata, 

 gutta cellul posterioris primse unica; vena longitudinalis tertia non 

 setosa. 



Yellowish-gray, abdomen black, sometimes of a dingy clay-yellow towards 

 the basis ; head and feet yellow ; scutellum with two bristles ; the black 

 picture of the wings is radiate on the apex, but the rays in the vicinity 

 of the posterior margin are less developed and less free ; the drops near 

 the posterior margin are more numerous, those in the middle of the 

 wing very sparse ; the first posterior cell contains but a single drop ; 



