16 AMERICAN HYMENOPTERA. 



them and eyes ; antenna clavate, entirely testaceous, in length about equal to 

 the head and that portion of the thorax anterior to middle segment; basal joints 

 of flagelhim not prominent beneath : dorsuium subtilely punctured ; mesopleurne 

 apparently granulated, or closely striato-punctate. its sculpture indistinct in con- 

 sequence of silvery pubescence ; enclosure of middle segment divided by a fur- 

 row, its rugae fine and very close, with a few transverse ones apically ; posterior 

 surface rugose, somewhat granulose above near the enclosure, apically the rugie 

 become more separated, and there are two smooth areas near insertion of petiole ; 

 legs with tarsi testaceous; abdomen claviform, entirely black, with margins of 

 first and second segments testaceous, or with the second segment red ; petiole 

 shorter than hind femur, rounded, not snlcate above, and only indistinctly on 

 sides ; wings paler than in most species, whitish at base, second submarginal 

 varying; tegulse testaceous. Length 7 mm. 



Montana. Two specimens. 



P. granulosus may yet prove to be the male of proximus, but it is 

 not probable. 



24. Pseii gregarius n. sp. 



% . — Head closely punctured, but not strongly ; face and clypeus silvery ; cly- 

 peus with fore margin produced a little medially; space between hind ocelli 

 slightly, if anything, less than that between them and eyes; antennae about as 

 long as the head and that portion of thorax anterior to middle segment, the fla- 

 gellum clavate. with joints 2-5, or 6, somewhat prominent beneath ; dorsuium 

 shining, indistinctly punctured : mesopleurae subtilely punctured : enclosure of 

 middle segment not well marked, its rugae distinctly separated, no median furrow 

 or area; posterior face depressed medially, rugose, but rather finely; legs dark, 

 tarsi testaceous ; abdomen with apex of first segment and second entirely, re.ddisli ; 

 petiole only about half as long as hind femur, rounded, rather slender, indis- 

 tinctly suleate near sides, the latter not sulcate : second submarginal cell trian- 

 gular, the subcubital veins meeting at top. Length 5.5 mm. 



Colorado (Gillette). One specimen. 



This species has the general appearance of nnicinctun % , and is 

 related to it in some respects. It differs chiefly in the clavate and 

 shorter antenme, more distinct rugte of enclosure of middle segment 

 and shape of second submarginal cell. The latter, however, may 

 not be a constant characteristic. 



25. Pseii proximus Cress. 



Mimesa proxima Cresson, 1. c, 488, 9 • 1865. 

 9 . — Head closely punctured ; front and clypeus silvery ; fore margin of cly- 

 peus sinuous, or subtruncate; space between hind ocelli about equal to that be- 

 tween them and eyes; antennae about as long as the head, pronotum and dorsu- 

 ium, flagellum strongly clavate; dorsuium subtilely punctured: mesoplenras 

 closely punctured, striated above; enclosure of middle segment with the rugae 

 very fine and close, with some transverse ones apically. not furrowed; posterior 

 face finely rugose, or with comparatively fine striations, which disappear medially, 

 at which place the posterior face is deeply sulcate: tarsi pale testaceous; abdomen 

 with first segment except base, second and third entirely and most of fourth, 

 reddish; petiole short, rather thick, equal to a little more than half the length 



