On new Coleoptera from Costa Rica. 115 



XX. — Descriptions of some new Coleoptera from Costa Rica. 

 By C. J. Gahan, M.A., Assistant, Zoological Department, 

 British Museum. 



Monsieur H. Pittiee de Fabrega, Director of the Institute 

 Fisico-Geografico Naciotial de Costa Rica, has forwarded to 

 Dr. Giinther two or three small collections of Coleoptera, 

 which were for the most part made on the little-explored 

 Pacific slope of that country. With the aid of the splendid 

 collections of Central-American Coleoptera presented to the 

 Museum by Messrs. F. D. Godman and O. Salvin it has not 

 been difficult for me to identify the large majority of the 

 species sent by M. Pittier ; but there still remain a few forms 

 which I have been unable to find in those collections and 

 which do not seem to be referable to any described species. 

 These I now describe : for one — an interesting species of 

 Carabida? — I have found it necessary to institute a new genus. 



Carabid.se. 



LEPTOTOMUS, gen. nov. 



Somewhat ovate or elliptic in outline. Head with two 

 setigerous punctures above each eye ; clypeus with a seta 

 near each of the antero-lateral angles ; labrum emarginate, 

 sex-setose along margin ; scrobe of mandible devoid of setas ; 

 mentum emarginate, without tooth ; ligula ending in a free 

 median chitinous process, at the sides of and beyond which 

 project the membranous lateral lobes (paraglossee), which are 

 rounded at tip ; second joint of labial palpi bisetose near its 

 extremity. Pronotum with a rather long seta near each of 

 the hind angles. Elytra rounded at apex, their surface 

 covered with very fine close longitudinal and parallel stria?, 

 almost microscopic in character ; each elytron with a row of 

 setigerous punctures along the outer margin. Fore tibia? 

 emarginate ; first four joints of fore tarsi ( $ ?) slightly 

 expanded, subspinose underneath. Antennas rather short, 

 first three joints glabrous, the rest pubescent; first joint 

 about equal in length to the second and third united; these 

 joints subcylindrical • the joints from the fifth to the tenth 

 each about as broad as long, the eleventh slightly longer but 

 scarcely narrower than the tenth. 



The short and ovate form of this genus suggest a position 

 for it near Barysoiuus and Bradybazus. 



