AUT. 26 WASPS OF SUBFAMILY PSENINAE MALLOCH 7 



KEY TO THE SUBGENERA OF PSBN 



1. Clypeus with two small rounded emarginations at apes, which give it the 



appearance of having three short acute teeth, the apex distinctly thickened 

 (pi. 1, fig. 3) ; hind femur with an elongate oval patch of short soft hairs 

 near apex on posterior surface, the piliferous punctures of the patch so 

 close as to give the area covered by it the appearance of an opaque shallow 

 depression (pi. 1, fig. 4) ; male abdomen without long soft fasciculate hairs 

 at apices of any of the sternites ; pygydial area of female narrow, shining, 

 with a few large shallow piliferous punctures along each side and usually 

 a slight longitudinal carina in center ; both recurrent nervures received by 

 second submarginal cell of fore wing; petiole of abdomen not sulcate 

 above, with a series of minute piliferous punctures along each side, the 



hairs very short and inconspicuous Pseneo, new subgenus 



Clypeus not tridentate, simple, or with a slight central notch or emargination 

 on each side of which there is a more or less evident broadly rounded 

 convexity or tooth, and rarely a second smaller tooth laterad of this ; hind 

 femur without an elongate oval patch of hairs on posterior surface near 

 apex 2 



2. Abdomen of male ■s^ith soft fasciculate hairs at apex of third, or apices of 



third and fourth sternites, which project downward and are sometimes 

 very prominent ; petiole of abdomen not sulcate and without the usual 

 series of piliferous punctures near each laterodorsal edge ; second recur- 

 rent vein sometimes interstitial with the one separating second and third 

 submarginal cells, or even entering the third ; hind femur bare on upper 

 half of posterior surface and with a rather noticeable series of soft hairs 

 extending from near base to apex below middle of surface, ventrad of 



which there are numerous fine microscopic hairs Psen Latreille 



Abdomen of male without fasciculate hairs at apices of any of the sternites ; 

 petiole sulcate above and with rather long hairs in lateral sulci, or if not 

 sulcate then with a series of piliferous punctures along each side of the 

 dorsum, the hairs being quite conspicuous ; hind femur usually with entire 

 posterior surface evenly covered with microscopic fine hairs 3 



3. A complete linear carina present on vertex from between bases of antennae 



to anterior ocellus ; abdomen almost always entirely black, petiole always 

 with 2 more or less complete and rather prominent carinae, so that there 

 are at least basally 3 evident dorsal sulci ; episternauli distinct, eps 1 



glossy and smooth Mimumesa, new subgenus 



Frontal carina absent or almost so ; abdomen almost always partly rufous ; 

 petiole usually flattened or convex above, sometimes with faint traces of 

 rounded carinae, never with distinct carinae beyond middle, lateral sulci 

 very shallow or absent, but the hairs always readily distinguishable ; 

 episternauli poorly defined, eps 1 not smooth, striate or striato-punctate. 



Mimesa Shuckard 



Pseneo, new subgenus 



Similar in general habitus to Pseii^ differing essentially in having 

 the clypeus in both sexes with two small rounded emarginations in 

 center at apex, causing it to appear centrally tridentate (pi. 1, fig. 3) ; 

 the petiole of the abdomen more or less rounded above, without dor- 



