30 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 82 



Propotleum rugoso-reticulate, definitely longitudinally striate basally in 

 enclosure and immediately against it for a short distance outwardly; 

 hind coxae not distinctly carinate on inner sides; petiole of abdomen 

 rather thick, laterodorsal edges sharp, sides slightly hollowed out and 

 lateroventral edge quite sharp; face fully as wide at lower edge of 

 iintenual insertions as long in center; apex of petiole red below 21 



21. Petiole with a quite evident broad carina or central longitudinal convexity 



on its entire dorsal length ; basal segment of antenual flagellum almost 



as long as next two segments combined pygidialis, new species 



Petiole flat, or almost so, on dorsum ; basal segment of anteunal flagellum 

 distinctly shorter than next two combined basirufus (Packard) 



22. Upper portion of mesopleura (eps 2) closely granular or reticulate, very 



minutely striate posteriorly, appearing entirely dull ; a portion of first, 

 all of second and third, and all or most of fourth tergite red; petiole of 

 abdomen about half as long as hind femur ; clypeus as in plate 1, figure 



19, without preapical elevation proximus (Cresson) 



Upper portion of mesopleura (eps 2) more or less glossy, longitudinally 

 striate or rugoso-reticulate ; if feebly sculptured the other characters are 

 not as above 23 



23. Clypeus with a rather prominent small elevation in center near apical margin, 



the latter as in plate 1, figure 20, in structure ; eps 2 shining and almost 

 without sculpture ; propodeum with fine striae, which extend from base 

 of enclosure divergently on each side to lateral curves ; apex of first tergite, 



all of second and third, red coquilletti Rohwer (=granulosus Fox?) 



Clypeus not as above in structure, if with a preapical elevation it is not so 

 high, and much longer, and apical margin is not as figured; eps 2 

 with well-developed sculpture, generally rather strongly longitudinally 

 striate 24 



24. Small species, averaging about 7 mm in length, with only apex of first and 



all of second tergite red ; propodeum leather coarsely sculptured, en- 

 closure with rather large rugose reticulations pauper (Packard) 



Larger species, averaging 8 mm or more in length, with apex of first, all of 

 second, and all, or a large part of, third tergite red 25 



25. Propodeum finely sculptured, lateral areas contiguous to enclosure very 



finely striate unicinctus (Cresson) 



Propodeum more coarsely sculptured, lateral areas contiguous to enclosure 

 rugoso-reticulate almost up to edge of latter borealis (Smith) 



26. Sternites 1 to 3 beyond petiole subequal in length, all more than twice as 



long on their median line as wide at base ; pronotum entirely rounded at 

 lateral angles ; enclosure of propodeum with small fine rugose reticula- 

 tions, contiguous lateral areas finely rugose, becoming reticulate at down- 

 ward curve ; wings whitish hyaline granulosus Fox 



Sternites not as above, 1 much longer than either 2 or 3, the last mentioned 

 two not nearly twice as long on median line as their width at base ; pro- 

 notum with well-developed lateral angles ; propodeum not as above ; wings 

 grayish or brownish hyaline 27 



27. Flagellar segments 2 to 5 or 6 each with a papillalike elevation on one side 



close to middle ; enclosure of propodeum with fine parallel longitudinal 

 striae, contiguous lateral areas with similar but finer and divergent striae 

 that become coarser toward downward curves; petiole of abdomen fully as 

 long as hind femur, slender and evenly convex above; width of face at 

 lower edge of antennal insertions not so great as length from there to 

 apex of clypeus in center cressoni (Packard) 



