316 NORTH AMERICAN TRYPETINA. 



preceding species, to the geuus Euaresta; it differs from them in 

 the presence of only two bristles upon the scutellum and in the 

 absence of bristles upon the third vein. In the system adopted 

 by me some time ago for the European Trypetidae, this species, 

 on account of the somewhat prolonged flaps of its proboscis and 

 of the bareness of the third vein, would have to be placed in the 

 genus Oxyna. I do not believe that its generic separation from 

 the preceding species is to be recommended. A close relative 

 of this species is a Brazilian one, which differs, however, in its 

 wings being comparatively much narrower and its body more 

 slender. I let its description follow : — 



T. tenuis n. sp. J. (Tab. X, f. 29.) — Augusta, luteo-cinerea, capite 

 pedibusque gracilibus flavis ; setae scutelli duae ; alae pro portione 

 augustae, pictura nigra, in angulo postico eluta, in apice radiata, prope 

 marginem posticuin confertius, in disco rarissime guttata, gutta cellula? 

 posterioris primae unicet. 



Slender, yellowish-gray ; the head and the slender feet are yellow ; wings 

 comparatively narrow, with a black picture, which is faded on the 

 posterior angle, radiate on the apex, more densely guttate near the 

 posterior margin, very sparsely in the middle of the wing, where the 

 first posterior cell contains but a single drop ; third longitudinal vein 

 not bristly. Long. corp. cum terebra, 0.13 ; long. al. 0.13. 



Body remarkably narrow and slender. Ground color blackish, but so 

 much covered with yellowish pile and pulverulence tbat thorax and 

 abdomen have a yellowish-gray appearance. Head, including antennae, 

 palpi, and proboscis, yellow ; occiput, on its upper half, with a large black- 

 ish-gray spot. The front a little more than of medium breadth ; its usual 

 bristles blackish. Face somewhat excavated and narrower than the front. 

 Antennae somewhat broad, not quite reaching the edge of the mouth, which 

 is somewhat drawn upwards, but does not project distinctly in the profile. 

 Eyes comparatively large and rounded ; cheeks very narrow. The palpi 

 reach to the anterior edge of the mouth. The suctorial flaps seem to be 

 somewhat injured in the described specimen, so that I am not quite sure 

 whether the proboscis is geniculate or not ; I believe that, in uninjured 

 specimens, it would look short-geniculate ; the dark color which the flaps 

 have in the described specimen is certainly an unnatural one. The 

 ground color of the thorax is altogether blackish, even upon the humeral 

 corners ; its upper side has a yellowish-gray appearance, in consequence 

 of its pulverulence and pile; on the metathorax and the pleurae the 

 coloring is more blackish-gray. The scutellum is of the same coloring 

 with the upper side of the thorax, the extreme apex only somewhat 

 tinged with yellow ; it bears only two bristles, which, like those of the 



