ART. 26 WASPS OF SUBFAMILY PSENINAE MALLOCH 37 



Front with rather deep punctures, which are very dense except 

 close to eyes on each side above, the postocellar region finely striato- 

 punctate to or slightly below curve, not tumid centrally; carina in 

 front of anterior ocellus almost obsolete; clypeus almost evenly 

 rounded in center of apex; antennal flagellum slightly clubbed at 

 apex, penultimate and antepenultimate segments distinctly longer 

 than thick, entire length of flagellum distinctly greater than that of 

 head and thorax combined. Pronotum with a spikelike lateral proc- 

 ess at each angle; mesonotum and scutellum glossy, without dis- 

 tinguishable shagreening, and with fine sparse punctures ; eps 2 shin- 

 ing, rather coarsely and irregularly longitudinally striate, eps 1 

 glossjT^, with a few fine striae above and almost without sculpture on 

 disk, not shagreened; propodeum with the enclosure rather small, 

 the sculpture within it consisting of quite closely placed wavy striae, 

 the areas adjacent to the enclosure finely striate anteriorly, becom- 

 ing more coarsely so posteriorly, and rugoso-reticulate slightly be- 

 fore curve. Petiole fully as long as hind femur and over 1.5 as long 

 as swollen section of the segment, convex above, with slight latero- 

 dorsal sulci and the edge beyond these quite sharply carinate, the 

 sides almost straight, the lateroventral edges carinate ; abdomen slen- 

 derer than in the fawper group. Legs and wings normal. 



Length, T-8 mm. 



Type (U.S.N.M. No. 44215) and one paratype male, Redlands, 

 Calif. (F. R. Cole). 



PSEN (MIMESA) EDENTATUS, new species 



Male. — Similar in color and general structure to punctifrons., dif- 

 fering mainly in the characters cited in the foregoing key. 



The antennae are a little more markedly clubbed than in puncti- 

 fi'07iSj and not so long, with the underside more broadly ochreous, 

 and the penultimate and antepenultimate segments not noticeably 

 longer than thick, and in addition the sensory areas are not so 

 sharply linear, being more moundlike and shorter as well as pale 

 in color and situated in the pale instead of the dark part of segments 

 2 to 5 or 6. The front is quite markedly humped up or tumid just 

 behind the space between the posterior ocelli, but there is no trans- 

 verse impressed line in front of the hump ; the sides of front between 

 the ocelli and eyes are less densely punctured than in the other 

 species referred to and lack striae; the clypeus has a slight central 

 emargination ; and the mandibles are without a well-developed inner 

 tooth near the apex. Mesonotum with very fine shagreening, alu- 

 taceous; propodeum with the enclosure larger than in punct/'frons, 

 the sculpture almost rugoso-reticulate and not. very coarse, the 



