48 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 82 



coarsely riifioso-roticulate, becoming striate basally alongside enclosure; 

 abdomen glossy black, apices of tergites rather conspicuously brownish 



yellow to testaceous in color marginata, new species 



Mesonotum not at all rugose or furrowed on disk, anterior lateral angles 

 with separated punctures; eps 1 not wrinkled longitudinally on upper 

 half 21 



21. Abdomen very conspicuously red on at least some part of one or more of first 



thrt'e torgitos ; propodenm with very fino straight striae on almost entire 

 length along sides of enclosure, which are directed obliquely outward and 

 backward, and posterior face finely reticulate rugose, appearing under a 



moderately high-power lens as almost granulose 22 



Abdomen not at all red on any part of any of first three tergites, though 

 apices of these may be brownish yellow ; propodeum except in miiuifa 

 more coarsely sculptured along sides of enclosure and posterior face 

 coarsely reticulate 25 



22. Smaller species, not more than 7 mm in length, with abdomen extensively 



red, usually apex of first tergite, all of second, and at least base of third, 

 red ; occipital carina practically obsolete for some distance on each side of 



central line below 23 



Larger species, not less than 7 mm in length, with abdomen less extensively 

 red, sometimes with second tergite largely black basally ; occipital carina 

 well developed, erect, to central line below 24 



23. Eps 2 almost glossy and with very small punctures- angulicornis, new species 

 Eps 2 but slightly shining and with moderately large subcontiguous 



punctures angulicornis var. 



24. Second abdominal tergite extensively blackened on b:isal half or more ; eps 



2 dull, appearing granulose, and with extremely small punctures, which 

 are not clearly discernible even with a magnification of 150 ; apical seg- 

 ment of hind tarsus brown, darker than other segments ; petiole of abdo- 

 men not half as long as hind femur brevipetiolata (Rohwer) 



Second abdominal tergite entirely red ; eps 2 distinctly shining, faintly alu- 

 taceous, with rather widely separated punctures quite distinct under a 

 m.agnification of 150; apical segment of hind tarsus whitish yellow like 

 the other segments pallidistigma, new species 



25. Small species, 5 mm in length ; sculpture of propodeum except enclosure very 



faint, consisting of fine striae, which are visible only posteriorly at curve 

 imder a magnification of 34 diameters, posterior face without distinguish- 

 able reticulations minuta, new species 



Larger species, about 7 mm in average length ; sculpture of propodeum much 

 coarser, consisting of rugose reticulations on most of area outside of 

 enclosure 26 



26. Petiole as long as thick part of first abdominal segment ; pygidium not 



twice as long as its width at center ; propodeum with rather fine reticu- 

 lations, enclosure without a large glossy diamond-shaped central 



area albifacies, new species 



Petiole of abdomen not so long as remainder of first segment ; pygidium more 

 than twice as long as its width at center ; propodeum coarser 

 sculptured 27 



27. Hairs of face silvery white; enclosure of propodeum without a large dia- 



mond-shaped glossy central area (pi. 2, fig. 33) tibialis (Cresson) 



Hairs of frice brassy yellow ; enclosure of propodeum with a large dia- 

 mond-shaped glossy central area (pi. 2, fig. 34) aerofacies, new spedes 



