ART. 26 WASPS OF SUBFAMILY PSENINAE MALLOCH 17 



2. Abdomen red on basal 2 or 3 tergites, the petiole and apex black ; occipital 



carina not connected with the one round mouth margin, evanescent on 

 its inner extremities (pi. 1, fig. 7) ; tegulae shagreened on their entire 

 surface, less distinctly so on posterior fourth in male, in female with 

 punctures or striae to their apices ; clypeus of female with four short 

 teeth, lateral pair very short (pi. 1, fig. 8), teeth in male less distinct; 

 antennal flagellum not noticeably yellowish ; pygidium of female broad, with 

 microscopic shagreening and rather dense and quite large piliferous punc- 

 tures on entire surface, the pile mostly lying close against surface so that 



sculpture is difficult to distinguish clypeatus Fox 



Abdomen nowhere red, sometimes some of the tergites brown or yellowish 

 brown at apices ; occipital carina connected with the one round mouth 

 margin (pi. 1, fig. 9) ; tegulae in both sexes with apical half or more 

 glossy and impunctate 3 



3. Males 4 



Females 13 



4. Antennal flagellum testaceous-yellow below, brownish above, segments 2 to 



6 with raised line on one side, first 2 with this quite inconspicuous, seg- 

 ments 4 to 6 with the raised part blackish brown and very conspicuous, 

 apical segment black, very strikingly differentiated from preceding seg- 

 ments (pi. 1, fig. 10) ; head with postocellar region glossy, very sparsely 

 and feebly punctured, without any evidence of striae ; mesonotum with 

 moderate-sized punctures and without striae except on posterior margin. 



mellipes Say 

 Antennal flagellum either entirely dark or, if yellowish below apical seg- 

 ment, not strikingly darker than preceding segments, and raised area on 

 none of segments is as markedly developed as nor strikingly darker than 

 remainder of segments that bear them 5 



5. Mesonotum striate or puuctato-striate on disk 6 



Mesonotum glossy, and with separated punctures and no striae on disk 9 



6. Mesonotum punctato-striate ; petiole of abdomen with central raised part on 



dorsum consisting of a single rather sharp carina on apical half which 

 is widened out and flattened on basal half or less and! has two or more 

 irregular impressed lines on surface which divide it into three quite 

 definitely undulated fine carinae ; underside of antennal flagellum reddish 

 yellow on almost its entire extent, the usual raised lines on one side of 



segments 2 to 10 indistinguishable canadensis, new species 



Mesonotum definitely striate on most of its disk ; petiole of abdomen with 

 dorsocentral carina with a single clean-cut sulcus on px'actically its entire 

 extent, tapering to a mere line posteriorly and widened anteriorly ; 

 antennal flagellum dark, with well-developed raised line or spot on 

 segments 2 to 10 or 2 to 9 7 



7. A raised line or spot present on flagellar segments 2 to 9; enclosure of 



propodeum with entire surface reticulated with raised lines, no large cen- 

 tral diamond-shaped glossy bare area ; tarsi yellowish white, mid pair 

 with flfth segment, hind pair with second to fifth segments, browned on 



at least upper surface striatus (Viereck) 



A raised line or spot present on flagellar segments 2 to 10; enclosure of 

 propodeum with a more or less well differentiated central diamond-shaped 

 glossy area 8 



8. Tarsi yellowish white, mid pair with fifth segment, hind pair with second 



to fifth segments, browned at least above ; vertex behind ocelli laterad of 

 outer ocellus on each side microscopically tranversely striate. 



longicornis Fox 

 175503—33 2 



