1899.] NATURAL SCIENCES OF PHILADELPHIA. 433 



4. Shining black, with middle segment, legs and petiole red, 



prominens ? . 

 Otherwise colored 5 



5. Front and clypeus striated" ,..'... striatifrons 9 d'. 

 Front and clypeus not striated, simply punctured 



rufipes d*. 

 ■6. Middle segment not sharply carinate, nor indeed carinate, 

 unless the angular crest of the two faces of the middle seg- 

 ment be called a carina 7 



Middle segment distinctly carinated on each face ... 14 



7. Postscutellum carinate, but not very distinctly, at sides . 8 

 Postscutellum emarginate or dentate 12 



8. Dorsulum finely striated longitudinally . . . thoi-acicus 9 . 

 Dorsulum sculptured otherwise 9 



9. Enlargement of first segment slender, elongate 



cylindricus ?cJ*. 

 Enlargement of first segment shorter, rol)ust . . . . 10 



10. Front and clypeus sti'iated 11 



Front and clypeus punctate imperfectus ?. 



11. Enlargement of petiole broadest anteriorly, sides converging 



apically, not rounded outwardly crktatus 9. 



Enlargement of petiole ovate or subcampanulate, sides strongly 

 rounded campanulaius 9cf. 



12. Ornamented with rufous 13 



Not at all rufous (front and clypeus striated) . hexagonus 9. 



13. Front rather finely striated hicolor 9<d. 



Front coarsely striated jjroductus 9(d. 



14. Enlargement of petiole very coarsely punctured, subtruncate 



anteriorly notatm 9 c? 



Enlargement of petiole strongly, but not coarsely punctured, 

 rounded anteriorly 15 



15. Pronotum not spinose laterally 16 



Pronotum spinose or subspinose 17 



16. Only the apex of petiole maculated with yellow, corirariics 9. 

 Thorax and abdomen at apex of all segments, yellow 



dlminutus 9. 



17. Body of petiole tolerably stout, ovate 18 



Body of petiole narrow, elongate, fusiform . incondans 9. 



28 



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