10 AMERICAN HYMENOPTERA. 



vous basally : i)ost-ooellar furrow becoming obsolete nieflially ; space between hind 

 ocelli about equal to that between them and eyes; dorsulum coarsely puiictured 

 and with some strong strife, but not so coarsely striato-punctate as in Kohlii ; 

 scutellum with large punctures, not striated ; mesopleurse strongly and rather 

 evenly punctured, not striated; enclosure of middle segment large, but not well 

 marked, with irregular rugie medially, those at sides oblique, and at apex trans- 

 verse; posterior face of middle segment not as coarsely rugoso-reticulate as in 

 Kohlii, with silvery pubescence apically; prouotum. sides of scutellum, post- 

 scutellum also with silvery hair; legs black, calcaria whitish ; petiole of abdomen 

 longer than in Kohlii, slenderer, not so much widened at apex, and subconvex 

 above; pygidium raised down middle, not distinctly carinated. with large punc- 

 tures on each side; wings clear; nervures dark. Length 11 mm. 



Colorado (Gillette). Two specimens. 



12. Pseii siniplieicoriiis n. sp. 



Psen nuter Packard. 1. c, p. 399, "J, (excl. 9 )■ 



9. — Head with distinct separated punctures, still less coai'se than in punctatus ; 

 face and clypeus with dense silvery pubescence; space between hind ocelli about 

 equal to that between them and eyes; dorsulum with coarse punctures and striae, 

 the latter, however, not as coarse as in Kohlii and pimcfat.iis ; scutellum with large 

 punctures, not striate ; mesopleurse strongly and rather closely punctured, not 

 striated, the punctures not so even as in puncfntus ; middle segment with a large 

 enclosure drawn out at apex into a deep furrow which divides the posterior face, 

 with a central diamond-shaped area, which contains some irregular rugse, or may 

 be nearly smooth; posterior face of middle segment rugoso-reticulate, more 

 coarsely than in punetattis, and becoming less coarse apically ; pronotum above, 

 sides of thorax, scutellum and post-scutellum at sides, and middle segment api- 

 cally with silvery pubescence; legs black, knees, tarsi and calcaria yellowish 

 testaceous ; petiole of abdomen rather slender, subconvex above, but little widened 

 at apex, distinctly longer than hind femur and trochanter; pygidium not dis- 

 tinctly raised or carinated medially, strongly punctured laterally; wings darker 

 than in punctatus, nervures testaceous. Length 10 mm. 



%, . — Front very coarsely and closely punctured ; antennse rather slender, about 

 as long as head and thorax united, the flagellum not dentate or nodose; dorsulum 

 closely sculptured; enclosure of middle segment with the central area narrowed 

 into a furrow, the lateral rugfe wider apart than usual ; posterior face covered 

 with great coarse pit-like areas ; sides at base rugose ; legs brownish, tarsi paler ; 

 jtetiole comparatively longer than in 9 \ second submarginal cell nearly square, 

 narrowed barely one-third above. Length 8 mm. 



Virginia; North Carolina. Three specimens. 



13. Psen fuwc'ipes Pack. 



Psen fuscipes Packard, 1. c. p. 402, 9 , 1867. 

 9-— Head with tolerably fine and close, though distinct punctures, much more 

 than in the other species of this group; face and clypeus with dense, pale golden 

 pube.scence ; space between hind ocelli perhaps slightly less than that between 

 them and eyes; clypeus hardly tridentate, the median tooth indistinct; antenn» 

 short, not longer than head and that portion of thorax anterior to scutellum, 

 davate; dorsulum finely punctured, shining; scutellum likewise; mesopleurfe 

 coarsely striated above and posteriorly, elsewhere apparently smooth and shining ; 

 enclosure of middle segment not so well marked as in the other species of the 



