Cresson.] 270 [January 27, 



tinged with dusky; nervures black, recxirrent nervures generally con- 

 fluent with those of submarginal cells, but sometimes the second is 

 received by the second submarginal cell near its tip; legs clothed with 

 thin, hoary pubescence; abdomen smooth and polished at base, indis- 

 tinctly punctured at tip; a slight apical fringe of hoary pubescence on 

 each side of basal segment. Length three and one half to four lines. 



The S is longer and narrower, clothed with whitish pubescence, 

 the abdomen subopaque, the face below antenna, spot at base of four 

 posterior tibiae, the anterior femora and tibise before, and basal joint 

 of all the tarsi, white; scape of antennae broadly dilated, heart- 

 shaped and concave beneath, the frontal half orange-yellow ; wings 

 hyahne, dusky at apex, the second submarginal cell, in the single 

 specimen before me, receives both recurrent nervures. Length three 

 and one half lines. 



Hab. Colorado Territory. Mr. James Ridings (Coll. Am. Ent. 

 Soc). " Hudson's Bay." Smith. 



2. P. varifrons, n. sp. ?. Deep black; head and thorax 

 opaque, finely and closely punctured; a cuneiform mark on each side 

 of face, sometimes a ^transverse mark on apex of clypeus, spot on 

 tegulae, another on tubercles, spot at base of all the tibiae, broad on 

 posterior pair, yellowish- white; mesothorax with faintly impressed 

 lines; metathorax subrugose, the enclosed basal space reticulated; 

 wings hyaline, faintly dusky towards apex, nervm-es black, neuration 

 as in 9 basalis, with same variation; legs with thin silvery pubes- 

 cence, especially on tibiaj and tarsi, tibial spurs whitish; abdomen 

 smooth, shining, the basal segment highly polished, with a slight 

 fringe of hoary pubescence on each side at tip, apical segments sub- 

 pubescent. Length two and one half to three lines. 



Hab. Colorado Territory. Mr. Jas. Ridings. (Coll. Am. Ent. 

 Soc.) This may be identical with elliptica Kirby, which I fail to 

 recognize. 



3. P. affinis Smith, Brit. Mus. Cat. Hym., i, p. 24. ?. Black, 

 opaque, head and thoi-ax very closely punctured, abdomen smooth 

 and shining, metathorax rugulose, coarsely so at base; a cuneiform or 

 triangular mark on each side of face, line or two spots on collar, spot 

 on tubercles, and base of all the tibiiE, much broader on posterior 

 pair, lemon-yellow; tegulaj piceous; wings hyaline, dusky at apex; 

 lateral apical margin of first abdominal segment with a more or less 

 distinct patch of whitish pubescence. Length two to three and a 

 half hnes. 



