82 Annals of the Carnegie Museum. 



6. Trachycorystes fisheri^, sp. nov. 



6667 a, C. M., type, 217 mm., male, Rio Sucio, Eigenmann. 



6668 a-e, C. M.; 13495 I. U. M., paratypes, 151-226 mm. Rio Sucio, 

 Eigenmann. 



6669 c, C. M.; 13496 I. U. M., paratypes, 75-103 mm. Quibdo. 

 Wilson. 



6670 a-f, C. M., 13497 I- U. M., paratypes, 46-89 mm. Rio Truando. 

 Wilson. 



D. I, 6; A. 21-25 (Type 24); head 4-4.5; width of head 4-4.5; depth 

 3.3-4; snout 2.7-3 iri head; eye 1.5-2 in snout. 



Head flat, granular, as broad as long. Profile of head slightly- 

 convex to above the eye, thence strongly concave to the articulation 

 of the dorsal spine. Maxillary bone extending beyond gill-opening 

 in adult male; to anterior border of eye in adult female. Adipose 

 short, 3 in head. Dorsal spine equal to length of head, which is equal 

 to length of pectoral spine, curved forward in male, with entire anterior 

 surface covered with short, heavy, irregularly placed spines; in the 

 female straight and almost smooth. Humeral process short and 

 pointing slightly upward, reaching only one-third of the distance to. 

 the end of the pectoral spine. Pectoral spine strong with strongly- 

 recurved teeth on its inner margin; its outer margin almost smooth. 

 Creamy white below, brownish above. Back and sides covered with 

 very black, irregular, longitudinal flecks and streaks, much more 

 abundant dorsally. Middle of caudal with a dark bar in most speci- 

 mens. 



7. Imparfinis microps Eigenmann and Fisher, sp. nov. 



8778, C. AL, type, 75 mm. Rio Negro at Villavicencio, Colombia, 

 Gonzales. 



Head 5.5; depth 7; D. 7; A. 12; snout 2.6 in the head; interorbital 

 nearly 4; eye 12 in the head, nearly 5 in the snout; adipose fin 4.4 

 in the length. 



Head depressed; jaws equal; all barbels extending to gill-openings, 

 when laid straight back; origin of dorsal behind vertical from front 

 of ventrals; base of anal slightly less than length of head. 



Fins hyaline, body with numerous brown chromatophores, more 

 abundant on back and anteriorly. 



5 Named for Carl G. Fisher, of Indianapolis, who helped to make possible a 

 second expedition to the type locality of this species. 



