ANNOTATED LIST OF THE SPECIES 187 
171. MONISTIANCISTRUS CARACHAMA Fowler 
Monistiancistrus carachama Fowler, 1939 (1940), Proc. Acad. Nat. Sci. Phila., XCI, 238, figs. 26 
and 27. ; 
Contamana, Rio Ucayali 
One specimen, the type, 95 mm. in length, at the Philadelphia Academy, 
is known. 
Genus 78: PTERYGOPLICHTHYS Gill 
Pterygoplichthys Gill, 1858, Ann. Lye. Nat. Hist. N. Y., VI, 408: 
figenmann and Kigenmann, 1890, Occ. Papers Cal. Acad. Sci., I, 427; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 408; 
Higenmann, 1912, Mem. Carnegie Mus., V, 227. 
Liposarcus Ginther, 1864, Cat. Fish. Brit. Mus., V, 238, sp. 
Ancistrus (in part) Regan, 1904, Trans. Zool. Soc. London, XVII, 221. 
Type: Hypostomus duodecimalis Cuvier and Valenciennes 
Rio Cauca, the Guianas to the Sao Francisco and Huallaga 
The granular snout and ten or more dorsal rays are diagnostic of the genus; 
the interopercle of form similar to that of Hypostomus, but often bearing more 
spines. On the whole they appear more robust and more erect than nearby genera. 
172. PTERYGOPLICHTHYS GIBBICEPS (Kner) 
Ancistrus gibbiceps Kner, 1854, Denksch. KKK. Akad. Wiss. Wien, VII, 284, pl. v, fig. 2; 
Regan, 1904, Trans. Zool. Soc. London, XVII, 227. 
Liposarcus altipinnis Giinther, 1864, Cat. Fish. Brit. Mus., V, 239. 
Pterygoplichthys gibbiceps Giinther, 1864, Cat. Fish. Brit. Mus., V, 252; 
Eigenmann and Eigenmann, 1889, Proc. Cal. Acad. Sei., (2), I, 44; 
Eigenmann and Eigenmann, 1890, Occ. Papers Cal. Acad. Sci., I, 429; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 407. 
Liposarcus scrophus Cope, 1874, Proc. Acad. Nat. Sci. Phila., XX VI, 136; 
Cope, 1878, Proc. Amer. Phil. Soc., XVII, 681, Nauta. 
Chaetostomus gibbiceps Steindachner, 1882, Denksch. KKK. Akad. Wiss. Wien, XLIII, 114, pl. iv, 
fig. 1. 
Hemiancistrus gibbiceps Fowler, 1939 (1940), Proce. Acad. Nat. Sci. Phila., XCI, 235, five, 117-270 
mm., Contamana. 
The Amazons, Gurupa to the Ucayali 
15349, 2, 293 and 343 mm., Iquitos, bayou, Allen, September, 1920. 
15350, 4, 159-280 mm., Yarinacocha, Rio Pacaya, Allen, August, 1920. 
The Iquitos specimens from muddy water much paler in color than those from 
the Pacaya. In the bulk, handling this species is like handling chestnuts in the 
bur. 
173. PreRYGOPLICHTHYS PUNCTATUS Giinther 
Ancistrus duodecimalis Kner (non Cuvier and Valenciennes), 1853 (1854), Denksch. KIk. Akad. 
Wiss. Wien, VII, 281. 
