ART. 26 WASPS OF SUBFAMILY PSENINAE— MALLOCH 27 



lack of a complete carina from the anterior ocellus to below the level 

 of the antennal insertions between the antennae and the presence of 

 distinct sculj^ture on the upper portion of the mesopleura (eps 2), 

 the latter being but indistinctly separated from the lower part (eps 1) 

 by an impressed line (episternauli). Usually the petiole of the 

 abdomen is rounded above, without lateromarginal sulci, and the 

 female has the pygidium broader and more closely punctate than 

 in typical members of the preceding group, though several of the 

 species of the latter have similarly formed pygidia. Most of the 

 species have the base of the abdomen red, but some are without this 

 characteristic. 



KEY TO THE SPECIES OF SUBGENUS MIMESA 



1. Males 2 



Females 17 



2. Abdomen red on first and second tergites beyond petiole 3 



Abdomen not distinctly red at base, sometimes with apices of tergites 



yellowish brown, or testaceous 26 



3. Segments 2 to 5 of antennal flagellum each with an angular elevation on 



one side, the highest point of which is at middle of segment, most evident 

 when segment is viewed crosswise, flagellum distinctly thickened to apex 

 and bright fulvous-yellow on entire underside; hind coxae with a sharp 

 carina on almost the entire inner side; propodeum (pi. 1, fig. 13) with 

 enclosure not very well marked, furnished with fine striae that diverge 

 slightly on each side, adjacent portions with much finer and more closely 

 placed striae that are sometimes almost obliterated on apical curve on 

 each side ; petiole rarely less than length of femur and trochanter com- 

 bined, rounded above, with a fine carina on each side of ventral surface, 



and above the carina a slight sulcus on each side cressoni (Packard) 



Antennal flagellum with much less evident, or no, elevations on second to 

 fifth segments, rarely as conspicuously j'ellow below or as distinctly 

 thickened apically, and when almost so then without evident elevation ; 

 hind coxae with at most a short carina on basal half or less of inner 

 side, usually merely rounded ; petiole of abdomen in species with flagellar 

 elevations not so long as hind femur ; propodeum either with coarser 

 sculpture or if almost similar then hind coxal carinae are lacking 4 



4. Legs and antennae entirely testaceous-yellow cingulatus (Packard) 



Legs and antennae at least partly black or very dark brown 5 



5. Upper part of mesopleura (eps 2) so closely and finely punctured that it 



appears to be granulose and without a distinct gloss; lower part (eps 1) 

 densely shagreened and dull, with moderate-sized close punctures ; flagel- 

 lar segments 2 to 5 or 6 slightly and evenly rounded when seen in profile, 

 the highest point at or close to the middle of each ; propodeum with areas 

 laterad of enclosure finely striate, surface granular so that striae are 

 almost invisible except under a very high magnification, sculpture becom- 

 ing reticulate at curve; petiole subequal in length to remainder of first 



segment proximus (Cresson) 



Upper part of mesopleura (eps 2) longitudinally striate or striato-punctate, 

 sometimes finely so, and like the lower part (eps 1) generally more or 

 less conspicuously shining ; other characters not as above in their 

 entirety 6 



