SOUTH AMERICAN NEMATOGNATHI. 133 



Maxillary barbels not extending to the adipose fin; men- 

 tal barbels reaching base, post-mentals to middle, of pec- 

 toral fins. Width of intermaxillary band of teeth 4 in 

 length of head. 



Eye 1| in snout, 4 in head, nearer posterior margin of 

 opercle than to the tip of snout. 



Gill-membranes separate to below anterior margin of the 

 eyes. Humeral process extending to middle of pectoral 

 spine. 



Dorsal spine inserted nearer tip of snout than to origin 

 of anal, its height 1^ in head, the highest dorsal ray about 

 equal to the length of the head. Adipose fin 4 in the 

 length, its distance from the dorsal fin equals three-fifths of 

 its own length. 



Caudal fin about 4 in the length . 



Anal fin convex, its highest ray If in head. 



Ventrals inserted behind the vertical from last dorsal ray, 

 not reaching the anal by one-third their length. 



Pectoral spine 1 in length of head, the fin not reaching 

 ventrals by one-half its length. 



Color uniform light brownish. 



Head 4f ; depth 5^; Br. 6; D. I, 6; A. 12. 



41. Pimelodella modestus (Giinther). 



42. Pimelodella elongatus (Giiuther). 



43. Pimelodella lateristriga (Muiler & Troschei). 



Localities: Santa Clara; Eio Mucuii; Rio Doce; Cannavierias; Sao 

 Matheos; Mendez; Kio Trombetas; Obidos; Iga. 



44. Pimelodella harttii (Steindachner). 



45. Pimelodella buckleyi (Bouieuger). 



Localities: Eio Parahyba; Macacos. 



46. Pimelodella vittata (Kroyer;. 



Localities: Eio San Francisco; Minas Geraes; Sao Matheos; Eio 

 Jequitiubonha. 



47. Pimelodella chagresi (Steindachner). 



Locality; Obispo Eiver. 



48. Pimelodella brasiliensis (Steindachner). 



