WILLIAM J. FOX. 13 



between hind ocelli distinctly greater than that between them and eyes ; antennse 

 shorter than head and that portion of the thorax anterior to the middle segment ; 

 dorsnlum with strong, separated punctures; mesoplenrse medially finely striato- 

 punctate, above strongly striated : enclosure of middle segment comparatively small, 

 with close, tolerably fine rngte, which are much finer and more closely set than in 

 nrgenfifrons, sulcata medially; posterior face of middle segment finely striated, 

 deeply sulcate down middle : sides closely and finely punctured ; abdomen with 

 first three segments and base of fourth, reddish ; petiole comparatively slender 

 convex and not sulcate above, on the sides indistinctly sulcate, slightly shorter 

 than hind trochanter and femur; second submargiual cell narrowed more than 

 one-half above. Length 9-10 mm. 



"^ . — Antennae fulvous, flagellum strongly clavate, with joints 2-4 nodose or 

 obtusely dentate beneath; tibiae and tarsi testaceous; petiole distinctly longer 

 than hind femur and trochanter; face and clypens densely silvery ; red color of 

 abdomen rarely extending beyond third segment. Length 8-9 mm. 



New Jersey : Camden County (June) ; Delaware; Illinois; Colo- 

 rado ; Montana. Quite distinct by the sculpture of middle segment 

 and form of male antennae. 



17. Pseii elialci Irons Pack. 



P.ien chalcifrons Packard, 1. c, 401, J. 1867. 

 5). — Head finely and closely punctured, on the front much more coarsely; 

 face and clypeus silvery ; clypeus short, its length much less than half its breadth, 

 the anterior margin in the middle truncate; space between hind ocelli equal to 

 but little more than half that between them and eyes ; antennae reddish, darker 

 above, flagellum subclavate; dorsulum longitudinally striated medially, and with 

 large punctures; mesopleurae finely striated, above apparently smooth ; enclosure 

 of middle segment with a median diamond-shaped area, on each side of which 

 the rugae are oblique and well marked ; posterior face sulcate medially, rather 

 closely rugoso-reticulale; legs black, with the fore and medial tibiae and base of 

 hind pair yellowish, tarsi whitish ; abdomen entirel.y black ; petiole about as loug 

 as hind femur, rather robust above, sulcate near each side, on sides not sulcate; 

 wings unusually iridescent; second submarginal cell small, narrowed somewhat 

 more than one-half above. Length about 6.5 mm. 



Illinois. I have only seen the unique type specimen of this spe- 

 cies, which seems to be quite rare. 



18. Psen borealis Smith. 



Mimusa borealis Smith. Cat. Hym. Brit. Mus., iv, 431, %, 18.56. 

 9.— Head with tolerably fine and close punctures; face silvery; clypeus con- 

 vex, punctured, subtruncate anteriorly, its length perhaps a little greater than 

 half its width; space between hind ocelli equal to less than that between them 

 and eyes ; antennte shorter than head and that portion of thorax anterior to the 

 middle segment, the flagellum stout; dorsulum sparsely punctured ; mesopleurae 

 finely striated, more strongly above and apically ; enclosure of middle segment 

 with a medial smootli area, with some irregular rugae in the middle apically, 

 those toward the sides longitudinal; posterior face rugoso- reticulate medially, 

 distinctly sulcate; sides finely punctured toward base; abdomen with apex of 

 first, second entirely, and base of third segment, reddish ; petiole shorter than 

 hind femur, above near each side distinctly sulcate. on the sides with a single 

 deep sulcus; second submarginal cell narrowed about two-thirds above. Length 

 7-8 mm. 



TRANS. AM. ENT. SOC. XXV. JANUARY, 1898. 



