816 NORTH AMERICAN TRTPBTINA. 



preceding species, to the genus 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 

 l>y nu5 some time ago for the European Trypetid©, this species, 

 on account of the somewhat prolonged flaps of its proboscis and 

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

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

 ihe preceding species is to be recommended. A close relative 

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

 wings being comparatively much narrower and its body more 



slender. I let its description follow : — 



T. tenuis n. sp. 9. (Tab. X, f. 20.) — Augusta, luteo-oinerea, oaplte 

 pedibusque graollibui Havis; sets Boutelll due; alee pro portlone 

 aogustas, piotura nigra In angulo postfoo eluta, In apioe radlata, prope 

 marginem postloum oonfertius, lo disco rarlsslme guttata, gutta collulso 



postorioris pliina' unictt. 



Blender, yellowiabjgray ; the head and the Blender feet are yellow; wings 

 comparatively narrow, wiiii a black picture, wbicb is faded <>u the 



posterior anj.;le, radiate On the apex, more densely guttata near tbo 



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

 first posterior oell oontalns but a single drop; third Longitudinal vein 



not bristly. Long. cor]), cum terebr.i 0.13 ; long. al. 0.18. 



Body remarkably narrow an.l Blender. (! round color blackish, but so 

 mUOh covered with yellowish pile and pul veruleneo that thorax and 



abdomen have a yellowish gray appearance. Head, including antenna", 



palpi, and proboscis, yellow j occiput, on its upper half, with ;i largo black- 

 Ish gray spot, 'the front ft little more than of medium breadth ; its usual 

 bristles blackish. Kaco somewhat excavated and narrower than the trout. 



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



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

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



reach to the anterior edge of the mouth. The suctorial Haps seem to bo 



BOmewhat injured in the described specimen, So that I am not quite | mo 

 Whether the proboscis is geniculate or not ; [believe that, in uninjured 

 specimens, it would look short rouiculat* J the dark color which the Haps 

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

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

 coiners; its upper side has a yellowish-gray appcara nee, in consequence 

 Of its pulvcrulenco and pile; on the metathorax and tint pleura- the 



oolorlng is more blaoklsh-gray% The soutellum Is <»r 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 tho 



