FISHES OF THE FAMILY LORICARIID^. 315 



originating below the first dorsal ray, extending to the anal opening ; adipose fin long, 

 well developed, without trace of spine. Distance from tip of snout to base of first 

 dorsal ray about 2f times in the total length, from base of last anal ray to the caudal 

 about 4f times. Body spotted or marbled with dark violet. 



The typical examples described and figured by Dr. Steindachner measure up to 

 180 mm. in total length. 



Bio Huambo and Bio Totora, Peru. 



13. Akges sabalo. 



Arges sabalo Cuv. & Val. Hist. Nat. Poiss. xv. p. 335, pi. 444 (1840) ; Gunth. Cat. Fish. v. p 222 

 (1864) ; Steind. Sitzb. Ak. Wien, lxxii. 1876, p. 598 (part.), and Denkschr. Ak. Wien, xlvi. 

 1882, p. 17, pi. iv. fig. 2. 



Length of head 3^ times in the total length. Interocular width less than the distance 

 from eye to posterior nostril, 4f-4§ times in the length of head. Outer series of teeth 

 of the praemaxillaries unicuspid ; mandibulary teeth bicuspid ; barbel extending §— § of 

 the distance from its base to the gill-opening. First dorsal ray equal to f the length 

 of head ; pectoral spine extending to middle of ventral : ventrals originating below the 

 first ray of dorsal, extending to the anal opening ; adipose fin long, well developed, 

 without trace of spine. Distance from tip of snout to base of first dorsal ray 2f-2f 

 times in the total length, from base of last ray of anal to the caudal 5 times. Body 

 marbled with dark brown ; fins with dark spots. 



The typical example described and figured by Dr. Steindachner is 200 mm. in total 

 length. I have examined one small specimen, 55 mm. in total length, from Bozmaiu, 

 Upper Peru, which differs only in the somewhat longer barbel. 



14. Arges taczanowseii. 



Arges sabalo (part.) Steind. Sitzb. Ak. Wien, lxxii. 1876, p. 598. 

 Arges taczanowski Bouleng. Proe. Zool. Soc. 1890, p. 451, pi. xli. fig. 1. 



Length of head 4 times in the total length. Interocular width much less than the 

 distance from eye to posterior nostril, 4^ times in the length of head. Outer series of 

 teeth of the praemaxillaries unicuspid ; mandibulary teeth bicuspid ; barbel extending 

 to the gill-opening. First dorsal ray equal to f the length of head ; pectoral spine 

 extending to posterior \ of ventral ; ventrals originating nearly below the first dorsal 

 ray, extending a little more than -§ of the distance from their base to the anal opeuing. 

 Adipose fin long, well developed, without trace of spine. Distance from tip of snout 

 to base of first dorsal ray 2f times in the total length, from base of last anal ray to the 

 caudal 5 times. Yellowish, marbled with purplish brown. 



Total length 84 mm. 



One specimen from Amable Maria, Peruvian Andes. 



