JAMES CHESTER BRADLE\ 313 



9. Second dorsal segment with long, scarlet, sometimes yellowish, puljes- 

 cence, except sometimes at base; petiole rugose, but shghtly enlarged 

 at apex, as seen from the sides neither gibbous nor strongly constricted 



from the second segment macra (Cresson) 



Second dorsal segment with short, sparse, usually orange hairs confined 



to the apical half, the others black (10) 



10. Petiole strongly nodose, and as seen from the side constricted before the 



second segment, closely and coarsely punctured castor (Blake) 



Petiole shorter and broader, as seen from the side not nodose, scarcely 

 constricted before the second segment, weakly and sparsely punctured. 



lepeletierii (Fox) 

 Petiole short and broad, moderately nodose, very coarsely punctured. 



agenor (Fox) 



Fern ales'- 



1. Lateral angles of the head prominent and carinate or tuberculate; pygidium 



striate (2) 



Lateral angles of the head rounded, neither carinate nor tuberculate . . (9) 



2. Petiole transverse or quadrate, its posterior border almost truncate and 



grossly punctured, as seen from the side it is only shghtly thickened 

 posteriorly and distinctly constricted from the second; second dorsal 

 segment medially sparsely punctate; hind angles of the head subrounded 



and not prominently tuberculate rugulosa (Fox) 



Petiole not quadrate, its posterior border strongly convex, without coarse 

 sculpture, as seen from the side strongly elevated posteriorly and not 

 appreciably constricted before the second segment; second dorsal uni- 

 formly closely pimctured (3) 



3. Front with a delicate carina on each side extending from the base of the 



antenna to the eye; head including the eyes, wider than the thorax, 

 its posterior margin nearly truncate, somewhat sinuous, its occipital face 

 with a transverse flattened tubercle at each lateral angle; the thorax 

 narrowed posteriorly; the caudal face of the propodeum sloping. 



cariniceps (Fox) 

 Front without carinae between the eyes and the antennae; head no wider, 

 often narrower than the thorax, its posterior margin either strongly 

 concave or nearly truncate, in which case it has an oblique tubercle at 

 the angles; the caudal face of the propodeum almost at right angles to 

 the dorsum (4) 



4. Lateral angles of the occiput witli an ()l)li(iu(' tubercle (8) 



Lateral angles of the occiput without an obliciue tuliercle (5) 



5. Margins of the head behind the eyes flaring outward to the very prominent 



angles, which are one-third farther apart than the least distance be- 

 tween the eyes; base of the propodeum marked by a carina and 

 groove, sometimes more or less interrupted (6) 



^ Chlamydala Melander, known only from Illinois, is omitted from this table 

 as I have not seen a specimen. 



TRANf^. AM. ENT. SOC, XLII. 



