18 H. C. FALL. 



Prothorax more closely and less finely punctate, elytral punc- 

 tuation coarse, dense and much confused, except for the 



geminate striae 5 7 . acerba . 



Clypeal margin more evidently but very broadly sinuato-emar- 

 ginate or sinuato- truncate at middle; front angles of thorax 

 slightly prominent; upper tooth of front tibiae distinctly 



ante-median; color rufoferruginous 58. ingeima. 



Claws not all similarly toothed (at least in one sex) , tooth of the 

 outer claw of the middle tarsi very large, laminiform, 

 with acute apex 59. planidens. 



25. Clypeal margin moderately to rather strongly arcuato-emarginate, 



the angles rather abruptly rounded; front angles of thorax 

 not prominent; upper tooth of front tibiae sub-median; 

 color brown or piceous 60. ambig'lia. 



26. Clypeus tumid, front rather deeply subtriangularly impressed at 



middle 61. cephalotes. 



Clypeus flat, or nearly so 27. 



27. Punctures of head close, usually nearly or quite in mutual contact 



and often densely crowded 28. 



Punctures of head well separated, usually by at least their own 

 diameters. 



Prothorax with apical marginal impressed line, scutellum normal 

 in size and without circumjacent impression; tarsi not 

 pubescent beneath 62. marginicollis. 



Prothorax without apical impressed line; scutellum small and 

 with a surrounding impression; tarsi densely pubescent 

 beneath 63. pubipes. 



28. Punctures of elytral disk confused only in the subsutural inter- 



space, elsewhere forming nearly regular rows. 



64. tremeiitiiia. 



Punctures of elytral disk broadly confused, except for the usual 



geminate striae 29. 



29. Interstices of elytral punctures numerously finely punctulate, 



color black, size large (14 mm.) 65. punctulata. 



Interstices of elytral punctures nearly or quite devoid of minute 

 punctuation 30. 



30. Front between the upper portions of the eyes distinctly bi- 



impressed 31. 



Front not impressed 32 . 



31. Labrum deeply impressed; prothorax rather densely punctate; 



dark brown 66. peninsularis. 



Labrum broadly impressed. 

 Front claws in male cleft, middle and hind claws toothed; all 



claws toothed in female; prothorax very densely punctate; 



color brown 67. auxins. 



Claws similarly toothed in the sexes; prothorax finely sparsely 



punctate; color black 68. anthracma. 



