198 FISHES OF WESTERN SOUTH AMERICA 
dorsal and adipose spine; spiniferous portion of pectoral not quite reaching spin- 
iferous part of the ventrals; ventrals reaching to near tip of anal; mouth with a 
double row of tentacles, in the middle a few tentacles between the two rows. 
Sides and top of head with obscure light spots about as large as the eye; dorsal 
rays alternately light and dark; caudal with two irregular cross-bands lighter in 
color; ventral and pectoral fins like the dorsal in color. 
A specimen of 54 mm. from the Rio Comberciato probably belongs here. It 
had only two small tentacles just before each interopercle, one belonging to the 
upper, the other to the lower series. General coloration of head and trunk uniform 
dark. 
197. ANCISTRUS TEMMINCKII (Cuvier and Valenciennes) 
Hypostomus temminckii Cuvier and Valenciennes, 1840, Hist. Nat. Poiss., XV, 514, Cayenne. 
Ancistrus temminckii Bleeker, 1864, Silures de Suriname, 11, pl. 1, fig. 3; pl. 1, fig. 2, Surinam; 
Figenmann and Eigenmann, 1889, Proc. Cal. Acad. Sci., (2), I, 48; 
Eigenmann and Eigenmann, 1890, Occ. Papers Cal. Acad. Sci., 1, 448; 
EKigenmann and Eigenmann, 1891, Proc. U.S. Nat. Mus., XIV, 43; 
figenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, ITT, 411. 
Ancistrus temmincki Wigenmann, 1912, Mem. Carnegie Mus., V, 237. 
Xenocara temminckii Regan, 1904, Trans. Zool. Soc. London, XVII, 254. 
Guiana and Peruvian Amazonia 
15369, 2, 127 and 162 mm., creek, Yurimaguas, Allen, November, 1920. 
15372, 1, 92 mm., Puerto Bermudez, Allen, July, 1920. 
Largest nearly twice the size of the specimens from Guianas. 
Mandibular ramus 3.3 in the interorbital (Guiana specimens 2.33 to 3.0); D. 
8 (Guiana specimens 6); eye 6.3 (Guiana specimens 5.5); 14 interopercular spines 
(Guiana specimens about 10); 3d pair of dorsal plates divided by dorsal fin (in 
Guiana specimens 3d pair lies between occiput and dorsal); in the Yurimaguas 
specimens 13 plates between anal and caudal (Guiana specimens 10); 5 between 
dorsals in both; lateral plates in Yurimaguas specimens 25 (Guiana 23). 
In our material the opercular spines clothed to near their extremities; dorsal 
spine equals length of head; spots on the fins form a wavy line. 
In other respects the Peruvian specimens conform very well to the descriptions 
of temminckii. Many of the above variations may be accounted for largely by the 
greater size and age of the material, and the juvenile character of the types. 
198. ANCISTRUS OCCIDENTALIS (Regan) 
Xenocara occidentalis Regan, 1904, Trans. Zool. Soc. London, XVII, 257, pl. xiv, fig. 5. 
Ancistrus occidentalis Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, ITI, 411. 
Canelos, Ecuador 
Seven specimens of the Buckley collection, up to 115 mm., referred by Bou- 
lenger to Ancistrus cirrhosus. 
