312 NORTH AMERICAN TRYPETINA. 



beset with extremely short and scarce bristles. Long. corp. 0.17 ; long, 

 al. 0.1(5. 



Syn. Trypeta timida Loew, Dipt. Am. Cent. II, No. 76. 



Clay-yellow ; the coloring of the head is of a purer yellow, but 

 the middle of the occiput is grayish. Front comparatively nar- 

 row; its pale brownish bristles are strong and long. Antennas 

 yellow, not reaching to the oral edge ; anterior corner of the third 

 joint rounded; arista comparatively thin, its pubescence so short, 

 that, to the naked eye, the arista appears bare. Face excavated ; 

 the anterior edge much drawn upwards, but little projecting in 

 the profile. Eyes elongated-rounded ; cheeks very narrow. 

 Oral opening of a middle size, rather round ; the yellowish pro- 

 boscis not geniculate, short ; palpi short, yellowish. The upper 

 side of the thorax is clothed with pale yellowish hairs; upon its 

 middle there is a weak trace of a very broad grayish stripe, which, 

 however, in less denuded specimens, may be hardly visible. The 

 bristles upon the upper side of the thorax are pale brownish ; 

 upon its middle there are three pairs. The yellow scutellum 

 bears four bristles. The ground color of the metathorax is 

 blackish-brown, but assumes a grayish aspect from a thin cover- 

 ing of pollen. The pleurae have a similar coloring, but towards the 

 upper margin, it becomes more yellow, and below the root of the 

 wings there also is a spot of dingy yellow. The clay-yellow abdo- 

 men shows, in the described specimen, upon the last two segments 

 brownish spots, which, however, seem to be the result of some 

 lesion. Feet yellow. Wings rather broad with a brownish black, 

 very sparsely reticulated picture, which is radiated on the apex ; 

 the root of the wings is very sparsely spotted before the end of 

 the two small basal cells; the costal cell, near its basis, has a 

 blackish transverse line, a brownish-black one beyond its middle, 

 and another brownish-black one upon its extreme end ; the 

 obliterate end of the auxiliary vein, which runs perpendicularly 

 towards the anterior margin, is rather hyaline ; stigma brownish- 

 black with a yellow crossline in the vicinity of its end ; immedi- 

 ately beyond the stigma there are two cuneiform hyaline inden- 

 tations, which extend from the margin to the second longitudinal 

 vein ; the latter is somewhat romote from the margin ; between the 

 second of these indentations and almost the end of the second 

 vein, the brown color is not perforated; along the apex, the 



