28 PROCEEDINGS OF THE NATIONAL, MUSEUM vol. Sli 



6. Propodeum with areas immediately laterad of enclosure broadly smooth 



and glossy, the smooth part extending to, or almost to, curve ; antennal 

 flagellum yellow, narrowly browned above, clubbed much as in cressoni, 

 but with no evident sensory elevations on any of the segments ; eps 2 

 with very fine and irregular longitudinal striae, which are most notice- 

 able posteriorly, surface shining but obscured by dense closely appressed 



silvery white hairs politus, new species 



Propodeum with quite distinguishable sculpture immediately laterad of 

 enclosure 7 



7. Antennal flagellum with not more than apical six segments bright orange- 



yellow below 8 



Antennal flagellum bright orange-yellow on entire length of underside or 

 with only basal segment blackened below 9 



8. Petiole of abdomen flattened above, sometimes shallowly grooved along 



median line ; basal segments of flagellum hardly longer than second, sen- 

 sory areas very broad, slightly shining, and not sharply differentiated 

 from remainder of segments 2 to 7; clypeus with a quite deep V-shaped 



central notch basirufus (Packard) 



Petiole of abdomen convex above, with a slight depressed line along each 

 lateral edge ; basal segment of flagellum about 1.33 as long as second, 

 sensory areas almost linear, not extending entire length of segment and 

 quite sharply elevated and differentiated; clypeus with a rather shallow 

 rounded central emargination unicinctus (Cresson) 



9. Large species, not less than 10 mm in length ; male with a slight but evi- 



dent raised line on each side of disk of apical tergite on its apical fourth 

 or less which simulate the pygidial lateral carinae of female (pi. 1, 

 fig. 14) ; antennal flagellum clubbed at apex, basal segment about 1.5 as 

 long as second, preapical segment not so long as wide, and no segment 



with distinct raised sensory area pygidialis, new species 



Smaller species, not more than 8 mm in length ; apical tergite without 

 raised lines 10 



10. Pronotum with a spikelike production of each lateral angle; hind coxae 



rather sharply carinate on at least the basal half or their inner or opposed 

 surfaces; petiole distinctly longer than swollen part of first segment; 

 apex of first, all of second, and at least the basal half of third tergite 



red 11 



Pronotum rounded or merely angulate on each lateral angle 13 



11. Interocellar region with closely placed punctures, whole width of front 



behind ocelli finely transversely striate and with similar punctures to 

 those on interocellar region, the part immediately behind space between 

 posterior ocelli as densely punctured as remainder and not at all tumid; 

 mesonotum with no trace of shagreening on disk except faintly in 



front punctifrons, new species 



Interocellar region not evenly punctured, the region behind it quite markedly 

 tumid, and surface not transversely striate ; mesonotum with very distinct 

 shagreening 12 



12. Fore and mid tibiae fulvous-yellow ; dorsolateral sulci of petiole unde- 



veloped edentatus, new species 



Fore and mid tibiae largely dark brown ; dorsolateral sulci of petiole 

 distinct impressifrons, new species 



13. First, second, and third tergites of abdomen entirely red ; propodeum finely 



rugoso-reticulate, enclosure appearing granulose except under a very higli 

 power lens (pi. 1, fig. 15) ; petiole a little shorter than swollen part of 



