The present paper deals with the study of male genitalia of some Nepalese species of Catharsius Hope. The male genitalia of four species of Catharsius Hope- C. granulatus sharp, C. molossus (L), C. birmanensis Lansb. C. pithecius (F) have been described and illustrated here. Male genitalia of Catharsius consists of phallobase, parameres, aedeagus and endophallus. Of these, phallobase and aedeagus of all the four species reported here are generally alike, but parameres and endophallus are different. This study also provides a reliable key for identification of the males.