420 



stronger than those of the upper jaw. The ventral fin reaches to 

 the origin of the anal, the pectoral somewhat beyond the base of the 

 ventral. Scales very thin ; the lateral line descends abruptly above 

 the pectoral towards the belly, and runs much nearer to the abdo- 

 men than to the back. Silvery, with a light blackish spot behind 

 the shoulder, above the lateral line ; caudal red. 

 Hah. Western Andes of Ecuador. 



inches, lines. 



Total length 5 3 



Height of the body 1 1 



Length of the head 1 4 



Width between the eyes 0 4 



Diameter of the eye 0 3^ 



Height of the dorsal 0 9£ 



Height of the anal 0 7| 



One of the specimens has blackish vertical lines all along the side, 

 and the fins broadly margined with blackish. Another has the ven- 

 tral fins very short, only half the usual length, though with the full 

 number of rays. 



9. Chalceus brevirostris, n. sp. 



D. 11. A. 37. V. 8. L. lat. 46. L. transv. 6/7. 



The height of the body is one -fourth of the total length, the length 

 of the head one-fifth. [The width between the orbits equals the 

 diameter of the eye, and is rather more than the extent of the snout* .] 

 The snout is short and obtuse, the upper maxillary slightly overreach- 

 ing the vertical from the anterior margin of the eye. The anterior 

 teeth are the strongest, those of the lower jaw much stronger than 

 the upper ones. The ventral fin reaches to the origin of the anal, the 

 pectoral somewhat beyond the base of the ventral. Scales very thin. 

 The lateral line descends in a gentle curve from its origin, and runs 

 a little nearer to the ventral margin than to the dorsal. Shining 

 silvery, with an indistinct lateral band, continued to the middle of 

 the caudal margin, where it is black. 



Hah. Western Andes of Ecuador. 



inches, lines. 



Total length 2 7 



Height of the body 0 7\ 



Length of the head 0 6 



Diameter of the eye 0 2 



10. Pimelodus, sp. ? 



A single mutilated specimen. 



11. Hypostomus erinaceus, Cuv. & Val. = Chcetostoma lobo- 

 rhynchus, Tschudi, Faun. Peruan. Ichth. p. 29. tab. 4. 



D.| A.i. ' 



* These statements may require modification upon examination of mature spe- 

 cimens, as those collected by Mr. Fraser are perhaps young ones. 



