314 NORTH AMERICAN TRYPET1XA. 



radiata, prope marginem posticum raro et in disco rarissime guttata, 

 gutta cellulae posterioris primae unica; vena longitudiualis tertia setosa. 



Yellowish-gray, head and feet yellow, abdomen shining brownish-black, 

 ovipositor concolorons, as long as the last three abdominal segments 

 taken together ; scutellum with four bristles ; the black picture of the 

 wings handsomely radiated on the apex, sparsely guttate in the vicinity 

 of the posterior margin, very sparsely in the middle of the wing; a 

 single drop in the first posterior cell ; the third longitudinal vein beset 

 with bristles. Long. corp. cum terebra 0.20; long. al. 0.16. 



Head, including palpi, proboscis, and antennae, yellow ; only the occiput 

 for the most part grayish. Front comparatively narrow ; its brown 

 bristles are long and strong. Antennae not reaching to the edge of the 

 mouth ; third joint rounded at the end ; arista comparatively thin, appear- 

 ing bare to the naked eye, as the pubescence is very short ; face excavated ; 

 the oral opening hardly of middle size, round; proboscis short, not geni- 

 culate. Palpi of middle size; the ground color of the thorax is altogether 

 black, including even the humeral callosities, but this color is so much 

 concealed under ochre-yellow pile and pulverulence, that it assumes a 

 yellowish-gray hue ; upon the pleurae and especially on the metanotum 

 the dark ground xjolor is more apparent. The scutellum, bearing four 

 bristles, is yellow to a considerable extent at the tip ; the abdomen is of 

 a shining brownish-black and shows weak traces of a yellowish-brown 

 pollen ; the pile is short and scattered, of mixed yellow and black hairs ; 

 the latter prevail or seem to do so, as many of the yellow hairs assume a 

 blackish hue when they do not reflect the light. The flat, not very 

 pointed ovipositor is pitch-black, shining, about as long as the last three 

 segments of the abdomen taken together, beset as far as the tip with a 

 brown pubescence, appearing black in some directions. Feet yellow. The 

 comparatively rather broad wings have a brownish-black, very sparsely 

 gnttate picture, which is handsomely radiate at the tip ; the root of the 

 wings, as far almost as the end of the small basal cells, is hardly spotted 

 at all ; the costal cell, quite near the humeral crossvein, has a grayish 

 crossline, a brownish-black one upon the middle and one of the same color, 

 but narrower, at the end ; the obliterate end of the auxiliary vein, run- 

 ning perpendicularly towards the anterior margin, is rather hyaline ; 

 stigma altogether brownish or only with a trace of a very small yellowish 

 drop in the vicinity of its apex, near the anterior margin ; immediately 

 beyond the stigma there are two hyaline indentations on the anterior 

 margin, the first of which alone reaches the rather distant second longi- 

 tudinal vein ; before the end of the second longitudinal vein near the 

 anterior margin, there always is a considerable hyaline drop, which T. 

 timida does not possess ; five rays of almost equal length occupy the apex ; 

 the first of them reaches the margin nearer to the end of the second than 

 of the third vein ; the two following are somewhat expanded at the tip 

 and end upon the tips of the third and fourth veins ; the last two rays 



