S. W. Williston — North. American Con ops. 337 



inner sides. Scutellum more or less reddisli, the usual spots on the 

 raet.'uiotuin indistinctly dusted. Pleura* cliiei3y reddish, especially 

 along the sutures, the disks of the segments sometimes mostly black- 

 ish. Abdomen black, the second segment, on its sides, and sometimes 

 the beginning of the third, reddish brown ; first segment with dis- 

 tinct, second with broader, especially on the sides, third and fourth 

 with moderately bi-oad, fifth with narrower borders of grayish 

 yellow dust ; posterior part of fourth, with the fifth and sixth dis- 

 tinctly whitened above. Legs reddish or reddish brown ; fore and 

 hind coxae darker, with satiny luster ; femora sometimes darker toward 

 the base, basal halves of all the tibire yellow, tips of all the tarsi dai'k 

 brown or black. Wings brown on the anterior half, lighter before 

 the first longitudinal vein ; from a little before the small cross-vein 

 the discal cell is hyaline, excepting a narrow dark cloud before the 

 fourth longitudinal vein, reaching nearly or quite to the great cross- 

 vein ; on the anterior side of the fourth vein an oval longitudinal 

 space in the first posterior cell, reaching nearly the whole length of 

 the segment of the vein, a lighter spot in the outer part of the sub- 

 marginal cell, near the margin. Petiole of the first posterior cell 

 about as long as the posterior cross-vein. Long, corp., 10-12""", 

 long, al., 7-9""". White Mts. (Patton, Moirison). Three specimens. 

 The veiy short first joint of the antennie renders it probable that 

 this is Walker's oethiops, but his very indefinite description of the 

 front and wings preA^ents me from feeling at all sure of it. 



Conops Burgessi, n. sp. 



S $ . Face and front yellow, vertex concolorous or reddish, when 

 the latter, with a moi'e or less faint narrow median stripe, scaix'ely 

 reaching the base of the antenna-. Facial grooves not distinctly dark- 

 ened, cheeks red. i^roboscis brownish red, black at tip. Antennai 

 red; first joint very short, scarcely a third the length of second ; third 

 joint a little more than half as long as second, rather symmetrically 

 attenuated, ^tyle l)lack, process of second joint small, not conspicu- 

 ous, tliird joint not thickened, moderately h)ng, conical. Occiput red, 

 not distinctly dusted. Thorax red; a broad, median, ])osteriorly ab- 

 breviated strij)e, s{)Ots in front of the humeri and disk of metanotum, 

 except the sides and uppei- edge, V»hick. No, unless very indistinct, 

 spots of dust near the humeri, nor elsewhere on the thorax. Abdomen 

 red, sometimes somewhat blackish on the sides of the segments, espe- 

 cially of the third; faint spots of dust on the first and near the tip of 



