284 NORTH AMERICAN TRYFETINA. 



Clay-yellow ; the metanotum, four rows of abdominal spots, and the short 

 ovipositor, deep black ; head of a brighter clay-yellow ; front very 

 broad, face moderately receding ; antennae long and acute ; the anterior 

 femora with a little black spot ; picture of the wings brown, reticulate 

 with rather large hyaline drops, among which three form a cluster in 

 the second posterior cell and four in the third. Long. corp. J cum 

 terebra 0.13 0.14; long. al. 0.14. 



Head almost ochreous-yellow, the rather level face, somewhat 

 retreating on the under side, the moderately broad cheeks, and 

 the lower portion of the occiput pale yellowish. Front more than 

 half as broad. as the whole head. Frontal lunule very flat. 

 Third antennal joint unusually long, with a remarkably sharp 

 anterior corner ; the thin, bare arista is incrassated at its basis 

 for a short distance only. Oral opening rather large, rounded, 

 but somewhat broader than long; its anterior edge is neither 

 drawn upwards, nor projecting in the profile. Proboscis and 

 palpi yellowish, withdrawn in the oral opening. The pile on the 

 head is ochreous-yellow ; the ordinary frontal bristles are brown- 

 ish or brown. The ground color of the thoracic dorsum is blackish, 

 with the exception of the pale yellow humeral callus, but very 

 much concealed under ochre-yellow pollen, and reddish ochre-yel- 

 low, coarse, and almost stubble-shaped pile. When the thorax is 

 viewed from behind, several opaque black, punctiform dots become 

 apparent, especially two on the transverse suture and two larger 

 ones between the first and the posterior border. The bristles of 

 the thoracic dorsum are partly pale yellow, partly brown ; viewed 

 against the light, they appear dark. The scutellum, which, in the 

 described specimen, is much damaged, seems very convex ; it is 

 smooth and for the most part yellow; among its four bsistles, the 

 two apical ones are inserted on small black dots. The abdomen 

 is reddish-yellow or almost honey-yellow and somewhat shining; 

 upon the second segment there are four black dots in a row, the 

 lateral ones of which are small ; upon each succeeding segment 

 the lateral spots become larger, and upon the fifth segment the 

 lateral spots completely coalesce with the middle ones, only a 

 median reddish line being left on the segment, The flat, shining 

 black ovipositor is hardly longer than the last abdominal segment. 

 Feet rather dark ochre-yellow; the front and intermediate 

 femora have, upon their hind side, beyond the middle, a little 

 black spot. The reticulate picture of the wings is brown, black- 



