ART. 26 WASPS OF SUBFAMILY PSENINAE — MALLOCH 39 



The salient characters for the identification of the male are given 

 in the foregoing key, and there is little if anything to add thereto. 

 Length, 8 mm. 

 Locality. — Colorado, no other data (Baker collection). 



PSEN (MIMESA) PYGIDIALIS, new species 



Plate 1, FiGfRE 14 ; Plate 2. Figure 22 



Male and female. — Shining black, the abdomen in the male with 

 the apex and lateral margins of first tergite and all the second and 

 third tergites red, rarely with a dark mark on apex of latter, the 

 female with entire first tergite and all the second and third tergites 

 red, apices of the other tergites inconspicuously brown or yellowish 

 brown. Face in male densely silvery haired, that of the female less 

 densely white haired; underside of the antennal flagellura broadly 

 testaceous-yellow except on basal segment. Legs black, apices of 

 fore and mid femora in male rather conspicuously fulvous, all tibiae 

 and tarsi in same sex fulvous, the hind tibiae generally browned cen- 

 trally, and the hind tarsi largely fuscous; the pale color on the legs 

 of the female much less, in the allotype present only on the anterior 

 side of fore and apices of posterior side of hind tibiae, and to some 

 extent on all tarsi, more preponderantly so on the fore pair. Wings 

 grayish hyaline, veins and stigma dark brown. 



Male. — Frons closely and finely punctured, must conspicuously so 

 in front of the ocelli, least so laterad of the posterior ocelli, where it 

 is rather glossy, the declivitous posterior part glossy and slightly 

 granulose, not striate ; space between the posterior ocelli greater than 

 that between either and eye; lower part of back of head finely ver- 

 tically striate ; distance from eye' to eye at lower level of antennal 

 insertions a little greater than that from latter to apex of clypeus 

 in center; face with dense appressed silvery white hairs; apex of 

 clypeus with a central notch on each side of which there is a broadly 

 rounded low lobe; antennal flagellum distinctly club-shaped, basal 

 segment not so long as the next two combined, penultimate and ante- 

 penultimate segments not so long on underside as they are thick, 

 second, third, and fourth segments each slightly elevated on one 

 side, the elevation not evident except under a very high-power lens 

 and neither highly polished nor distinguished in color. Mesonotum 

 rather dull, microscopically shagreened or alutaceous, the punctures 

 small and rather closely placed, scutellum not so closely punctured 

 and more glossy ; propodeum with the enclosure not very well marked 

 and quite finely reticulate or rugose, the adjacent areas with slightly 

 sinuous rugae, which become reticulations at the downward curve; 



