100 Mr. G. C. Champion's Revision of the Mexican 



h^. Inner anterior tarsal claw simply di- 

 lated at base. 

 a^. Species Telephoriform [= Ditemnus, 



Lee] Species 3-14. 



hr. Species Lyciforni Species 15. 



II. Prothoracic margins with a single median 

 or post-median incision. 



c. Prothorax subcampanulate, the margins 



with a very deep post-median notch 

 limited in front and behind by a sinu- 

 ous dentiform process ; eyes large : 

 species Lyciform Species 16. 



d. Prothorax transversely suborbiculate, the 



margins with a deep oblique notch at 

 middle, limited in front and behind by a 

 backwardly-curved lamella ; eyes large : 

 species small, Lyciform Species 17, 18. 



e. Prothorax small, transverse, the margins 



with a narrow deep oblique notch to- 

 wards base, limited in front by a long 

 backwardly directed process and be- 

 hind by a short sub-bidentate lamella; 

 eyes small : species small, Lyciform . Species 19. 

 /. Prothorax transversely orbiculate, the 

 margins notched or plicate at or behind 

 middle and more or less dentate : species 

 small, Lyciform or Telephoriform . . Species 20-32. 

 g. Prothorax with the margins dilated into 

 a backwardly-directed lobe or blunt 

 tooth before base : species small, 



Telephoriform Species 33, 34. 



III. Prothoracic margins very deeply incised 

 at base, and also notched at middle; 

 elytra metallic : species Telephori- 

 form Species 35. 



Species of doubtful position, females only 



known Species, 36-38. 



1. Silis longidens, n. sp. (Plate VIII, fig. 64, prothorax, ^.) 



cj. Elongate, shining, finely cinereo-pubescent; black, the head 

 on each side in front, the base of the mandibles, the prothorax 

 with the reflexed margins and the tips of the lateral teeth, the 

 anterior trochanters, and the tarsal claws, testaceous or whitish. 



