PISHES OF THE FAMILY LOBICAEIIDJE. 313 



Three examples from the Huamani Peak, Ecuador, 10,700 feet, received from the 

 Paris Museum as Brontes prenadilla. 



8. Aeges okientalis. (Plate XXI. fig. 4.) 



Arges orientalis, Bouleng. Ann. Mag. Nat. Hist. (7) xi. 1903, p. 601. 



Length of head 3§- 4 times in the total length. Interocular width less than the 

 distance from eye to posterior nostril, 3§— 4 times in the length of head. Outer series 

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

 -I— f- of the distance from its base to the gill-opening. First dorsal ray equal to f— f 

 the length of head ; pectoral spine not extending beyond base of ventral ; ventrals 

 originating below the first dorsal ray, extending about f of the distance from their base 

 to the anal opening, which is situated at f — f of the distance from the ventral to origin 

 of anal. Adipose fin, if present, very feebly developed, without or with a rudimentary 

 imbedded spine. Distance from the tip of snout to the base of first dorsal ray 2|- times 

 in the total length, from the base of last anal ray to the caudal 6-6 J times. Olive or 

 yellowish above, spotted or marbled with dark brown ; caudal with dark spots. 



Total length 80 mm. 



Ten specimens from the Albireggas and Milla Rivers, above Merida, Venezuela. 



9. Arges brachycephalus. (Plate XXI. fig. 8.) 



Arges braclnjceplialus Giintli. Proc. Zool. Soc. 1859, p. 92, and Cat. Fish. v. p. 222 (1864). 



Length of head 4-4 \ times in the total length. Interocular width equal to or a 

 little less than the distance from eye to posterior nostril, 3|-3f times in the length of 

 head. Outer series of teeth of the prsemaxillaries unicuspid ; mandibulary teeth 

 bicuspid ; barbel extending to beyond the gill-opening in the young, f— f of the distance 

 from its base to the gill-opening in the adult. First dorsal ray equal to f — | the length 

 of head ; pectoral spine extending to anterior \ of ventral; ventrals originating below 

 the first dorsal ray, extending to the anal opening, which is situated at § of the distance 

 from base of ventral to origin of anal ; adipose fin long and low, not well developed, 

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

 (young) to 2f (adult) times in the total length, from base of last anal ray to the caudal 

 4J-4^ times. Brownish, spotted or marbled with darker ; some dark spots on the 

 basal parts of the dorsal and caudal. 



Total length 218 mm. 



Ten specimens, including the types of the species from the Andes of Peru, and others 

 from Cuenca, Ecuador. 



10. Arges choice, sp. n. (Plate XXI. fig. 5.) 



Length of head 4^ times in the total length. Interocular width a little greater than 

 the distance from eye to posterior nostril, 3^ times in the length of head. Outer 



2t2 



