246 ME. C. TATE EEGAJST ON THE 



E. Interorbital width 3g— 3| times in the length of head. 

 Dorsal with I 9 (rarely I 10) rays, the last f as long 

 as the first 15. C. rnicrops Gthr. 



1. fClI^TOSTOMUS LOBOKHTKCHUS. 



Chmtoslomus loborhynchos Tschudi, Fauna Peruana, Pise. p. 26, pi. iv. (1845). 

 Cluetostomus loborhynchus Giinth. Cat. Fish. v. p. 250 (1864). 



Depth of body about 5| times in the total length, length of head about 3 times. 

 Head a little broader than long. Diameter of eye 7-8 times in the length of head and 

 2i times in the interorbital width. Interoperculum with 11 spines. Fold of the upper 

 lip with median prolongation. 25-26 scutes in a longitudinal series. Dorsal longer 

 than high, the length of its base equal to f the length of head. D. I 8-10. A. I 3. 

 Pectoral spine extending a little beyond the base of ventral. 



The typical example about 145 mm. in total length. 



Andes of Peru. 



2. Cjustostomus maculatus, sp. n. . (Plate XIV. fig. 4.) 



Depth of body 5^-6 times in the total length, length of head 2f times. Head as 

 broad as long and 2\ times as long as deep. Diameter of eye about 9 times in the 

 length of head, interorbital width 2-§— 2f times, length of snout If times. Length of 

 mandibular ramus slightly less than the interorbital width. Interoperculum armed 

 with 7 or 8 spines. 25 scutes in a longitudinal series, 7 between dorsal and adipose 

 tin, 12 between anal and caudal. D. I 7 ; the first ray equal to f~f the length of head, 

 the last -§•-■§ as long; length of base of dorsal less than its distance from the spine of 

 the adipose fin, which is preceded by a keel formed by 3 or 4 scutes. A. I 3. 

 Pectoral spine not extending to base of ventral. Caudal peduncle 2-f times as long as 

 deep. Olivaceous, with rather large light spots on head and upper part of body; fins 

 spotted or clouded with darker. 



Total length 65 mm. 



Two specimens from Rozmaiu, Upper Peru. 



3. Ch^tostomus makcapaTjE, sp. n. (Plate XIV. fig. 1.) 



Depth of body about 5f times in the total length, length of head 3 times. Head as 

 broad as long and 2^ times as long as deep. Diameter of eye 6 times in the length of 

 head, interorbital width 2-J times, length of snout If- times. Length of mandibular 

 ramus 1\ times in the interorbital width. Interoperculum with 11 or 12 spine's. 

 24 scutes in a longitudinal series, 8 between dorsal and adipose fin, 13 between anal 

 and caudal. D. I 7 ; the first ray f the length of head, the last f as long ; length of 



