312 ME. C. TATE EEGAX OX THE 



ventral to the origin of anal. Adipose fin lpng, very weakly developed, with a small 

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

 total length, from base of last anal ray to caudal 5 times. Brownish, closely spotted 

 with darker. 



Total length 84 mm. 



A single specimen from Milligalli, Andes of Ecuador. 



6. Akges eigenmanni, sp. n. (Plate XXI. fig. 3.) 



Cyclopium cyclopum (non Humb.) Putnam, Am. Nat. 1871, p. 694; Eigenm. & Eigenm. Proc. 

 Cal. Ac. (2) i. 1888, p. 164, and Occ. Pap. Cal. Ac. i. 1890, p. 350. 



Length of head 4^ times in the total length. Interocular width nearly equal to the 

 distance from eye to posterior nostril, o~- 3f times in the length of head. Outer series 

 of teeth of the prremaxillaries mostly unicuspid, mandibulary teeth bicuspid ; barbel 

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

 to I- the length of head ; pectoral spine extending to anterior \ of ventral ; ventrals 

 originating below, or nearly below, the first dorsal ray, extending f— J of the distance 

 from their base to the anal opening, which is situated at -f- of the distance from the 

 base of ventral to the origin of anal. Adipose fin long, very weakly developed, with a 

 small spine which is completely imbedded in the adult. Distance from tip of snout to 

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

 4-§— 5 times. Greyish, sometimes spotted with darker ; usually a series of whitish spots 

 on the pores of the lateral line. 



Total length 100 mm. 



Several specimens from Cayambe and Machachi, Ecuador, collected by Mr. E. 

 Whymper. „ 



7. Arges vaillanti, sp. n. 



Length of head 4-4| times in the total length. Interocular width nearly equal to 

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

 of teeth of the pramiaxillaries mostly unicuspid ; mandibulary teeth bicuspid ; barbel 

 extending to, or nearly to, the gill-opening. First dorsal ray equal to f the length of 

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

 nearly below, the first dorsal ray, extending f-f of the distance from their base to the 

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

 anal. Adipose fin weakly developed, with a small spine which is completely imbedded 

 in the adult. Distance from tip of snout to base of first dorsal ray 2§-2f times in the 

 total length, from base of last anal ray to caudal 6 times. Brownish ; a large dark 

 blotch or bar at the base of the caudal ; rays of all the fins with obscure dark spots. 



Total length 95 mm. 



