132 PROCEEDINGS OF THE ACADEMY OF 



This species has the palmation of R. affinis^ and the short legs 

 of R. hrempalmata ; the tympanum is smaller than in either. 

 The head is longer and the femur shorter than in the latter. The 

 coloration is notably distinct. In neither of these species do I 

 find the dorsolateral dermal fold of the R. affinis, though this may 

 be due to the rather soft state of the specimens. 



From Nauta. 



NEMATOGNATHI. 



Trichomycterus pardus, sp. nov. 



Origin of dorsal fin but little behind a point above that of the 

 ventrals. Radii, D. 8 ; A. 6 ; V. 5 ; A. 12; truncate. Head flat, 

 enterinsf the length without caudal fin 4.8 times. Diameter of 

 orbit one-sixth length of head, and one-half interorbital breadth. 

 Nareal beard extending backwards beyond eye, and the maxillary 

 to the border of the suboperculum. Preopercular and opercular 

 patches full. Color above yellowish-brown, with three rows of 

 dark-brown spots on the sides. ' Fins and lower surfaces pale and 

 unspotted. Total length, .073; caudal fin, .011; head, .010; 

 depth at dorsal fin, .011. 



This is one of the few species of the genus where the dorsahfin 

 is nearly immediately above the ventrals. 



From 



Trichomycterus rivulatus, Cud., vol. xviii. 495. 



From Arequipa, Peru. 

 Bunocephalus melas, sp. nov. 



Radial formula: D. 5 ; P. I. 5 ; Y. 6 ; A. 7 ; C. 10. Head and 

 shield are elongate oval, without prominent ridges or marginal 

 angles. The anterior humeral tuberosity marks one-third the 

 length to the middle of the shield at the basis of the dorsal ra3^ 

 The width in front of the pectoral spine is a little less than .25 of 

 the total length (including caudal fin) ; the length of the post- 

 coracoid process is equal to nearl}^ two-thirds of the interspace 

 between them. The maxillary barbel extends to the end of the 

 basal third of the pectoral spine; the latter oppressed, reaches the 

 base of the ventral fins. Tail at anal fin wider than deep ; com- 

 pressed near the base of the caudal fin. Four rows of wartlets 

 on the sides, one of them on the lateral angle of the tail. Dorsal 

 fin nearer the end of the muzzle than the base of the caudal fin by 

 two-thirds the length of its base. 



