AUT. 1'6 WASPS OF SUBFAMILY PSENINAE MALLOCH 33 



a distinct central convex area on its entire extent which is variable 

 in width, but there is always a sulcus close to the lateral edge on each 

 side in which there are numerous fine short hairs; the length of the 

 petiole in the female is hardly more than half that of the hind 

 femur, while in the male it is about two thirds as long as the femur 

 and slenderer than in the female, the general structure being sim- 

 ilar to that of U7iicinctus, the lateroventral edge almost rounded. A 

 very striking character of the species is the finely undulate striate 

 sculpture of the upper portion of the mesopleura (eps 2), which 

 causes it to appear dull in both sexes, the two preceding species hav- 

 ing the sculpture coarser, consisting of almost straight longitudinal 

 striae and the surface is distinctly shining. The propodeum has the 

 enclosure very poorly outlined, with almost straight fine striae, which 

 are somewhat reticulated centrally at apex, and the adjacent areas 

 outside of the enclosure are finely longitudinally striate, very much 

 as in cressoni though a little more noticeably reticulate at the lateral 

 curve. The male has the antennal flagellum more clubbed than in 

 unieinctus, pale on the entire underside, and the second to sixth seg- 

 ments are raised on one side, though evenly and roundly so, with the 

 highest point at middle. The female has the apex of the first tergite, 

 all of second and third, and all or most of fourth red, but the male 

 has only the apex of first and all of second and third red. 



Length, 6.5-8 mm. 



Described from Colorado and since recorded from Nebraska. The 

 material before me is from Colorado and Springer, N.Mex. 



I know of no previous record of the recognition of the male of the 

 species. 



PSEN (MIMESA) GRANULOSUS Fox 



Psen granulosus Fox, Trans. Amer. Ent. Soc, vol. 25, p. 15, 1898. 



This is one of the most readily recognizable of the species described 

 by Fox, the entire black abdomen of the male being of a peculiar elon- 

 gate form with the apex pointed and the anterior margin of the two 

 sternites immediately beyond the petiole much narrower than usual, 

 that of the second being not more than one third as wide as its length 

 at center. The petiole is subequal in length to the dilated part of 

 the first tergite, convex above and with a shallow piliferous sulcus 

 along each side, the lateroventral edges sharp, subcarinate, and the 

 sides shallowly sulcate. The front of the head is closely covered with 

 small deep punctures, the face below the antennal insertions is about 

 as wide as its length in center, the clypeus has a slight central notch, 

 the mandibles are almost entirely black, the antennal flagellum is 

 testaceous-yellow, narrowly dark brown above, distinctly clubbed at 

 apex, the penultimate and antepenultimate segments not so long on 

 their lower edge as they are thick, and the basal segments without 



175503—33- 3 



