ANNOTATED LIST OF THE SPECIES 201 
203. HypopropoMA CARINATUM Steindachner 
Hypoptopoma carinatus Steindachner, 1879, Denksch. KIX. Akad. Wiss. Wien, XLI, 49, pl. vi, 
Amazon near Peruvian boundary; 
Bigenmann and Eigenmann, 1890, Occ. Papers Cal. Acad. Sci., I, 390. 
Hypoptopoma carinatum Regan, 1913, Ann. Mag. Nat. Hist., (8), XII, 281, Rio Ucayali. 
Solimoes and Ucayali rivers 
Genus 86: OTOCINCLUS Cope 
Otocinclus Cope, 1871, Proc. Acad. Nat. Sci. Phila., 283; 
Eigenmann and Eigenmann, 1889, Proc. Cal. Acad. Sei., (2), II, 41; 
Kigenmann and EKigenmann, 1890, Occ. Papers Cal. Acad. Sci., I, 390; 
Regan, 1904, Trans. Zool. Soc. London, XVII, 265; 
HKigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 412. 
Type: Otocinclus vestitus Cope 
Rio Ambyiacu, southeastern Brazil and La Plata 
Distinguishable by the extreme size of the ventral plate and the unique per- 
forations of the temporal plate. 
204. OTOCINCLUS VESTITUS Cope 
Otocinclus vestitus Cope, 1871 (1872), Proc. Acad. Nat. Sei. Phila., 283, pl. iv, figs. 2a, 2b, and 2c, 
tributaries of R. Ambyiacu; 
Higenmann and Eigenmann, 1889, Proc. Cal. Acad. Sci., (2), IH, 41; 
Jigenmann and Kigenmann, 1890, Occ. Papers Cal. Acad. Sci., I, 393; 
Regan, 1904, Trans. Zool. Soc. London, XVII, 267; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, IIT, 412. 
Rio Ambyiacu 
Known only from the types in the Philadelphia Academy. 
205. OrocIncLUs MACROsPILUS Eigenmann and Allen, sp. nov. 
Plate XIII, fig. 1 
15606, 12, 27-45 mm., the largest the type, Rio Morona, Allen, October, 1920. 
Head 2.8; depth 4; D. I, 7; A. I, 5; scales 25, eye 2 in snout, 4.5 in the head, 
2.25 in the interorbital; depth of caudal peduncle about equal to the length of the 
snout; dorsal spine a little shorter than the head; pectoral reaching to the middle 
of the ventral fins, the length of its spine about equal to the length of the head less 
half the snout. 
Back with dark cross-shades; top of head punctate; a black band from tip of 
snout along the middle of the sides to above the tip of the anal, tending to break 
up into spots toward the end; a very large, isolated spot across the entire end of 
caudal peduncle and base of the caudal; a curved dark bar across the caudal near 
the tip of the middle rays, another across the middle of the caudal lobes, more or 
less complete bars across the dorsal, and sometimes across the anal rays where they 
