ANNOTATED LIST OF THE SPECIES 91 
14. PsrUDOPIMELODUS PULCHER Boulenger 
Pimelodus (Pseudopimelodus) pulcher Boulenger, 1887, Proc. Zool. Soc. London, 276, pl. xxi, fig. 1, 
Canelos. 
Pseudopimelodus pulcher Eigenmann and Eigenmann, 1890, Occ. Papers Cal. Acad. Sei., I, 111; 
Pearson, 1937a, Proc. Cal. Acad. Scei., (4), X XIII, 92, Tingo de Pauea, Alto Marafion. 
Batrachoglanis pulcher Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 383. 
Eastern Ecuador and Upper Maranon 
15. PSEUDOPIMELODUS RANINUS (Cuvier and Valenciennes) 
Pimelodus raninus Cuvier and Valenciennes, 1840, Hist. Nat. Poiss., XV, 157, Rio de Janeiro. 
Pseudopimelodus raninus Steindachner, 1882 (1883), Denksch. KKK. Akad. Wiss. Wien, XLVI, 4, 
one specimen, 100 mm., Rio Huallaga; 
Kigenmann and Kigenmann, 1890, Occ. Papers Cal. Acad. Sci., I, 111. 
Batrachoglanis raninus Gill, 1858, Ann. Lyceum Nat. Hist. N. Y., VI, 389; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 383. 
Rio Huallaga to the Guianas and Rio de Janeiro 
Genus 8: CHASMOCRANUS Eigenmann 
Chasmocephalus Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, IIT, 384, preoccupied. 
Chasmocranus Eigenmann, 1912, Mem. Carnegie Mus., V, 160. 
Type: Chasmocranus longior Eigenmann 
The Guianas to the upper Maranon and southeastern Brazil 
Cranial roof naked, fontanel narrow and reaching base of occipital, interrupted 
in interorbital region and again back of eye level; occipital crest short and narrow; 
eye superior, without free orbital margin. First rays of dorsal and pectoral soft; 
origin of ventrals nearly under the origin of the dorsal; adipose fin low and free 
from caudal; anal short; caudal forked. Premaxillary tooth-area subrhomboidal, 
its outer posterior angle extending caudally. Snout not prolonged, barbels not 
flattened. 
16. CHASMOCRANUS QUADRIZONATUS Pearson 
Chasmocranus quadrizonatus Pearson, 1937a, Proc. Cal. Acad. Sei., (4), X XIII, 93, Tingo de Pauca 
and Pusoc, upper Maranon, two specimens, types. 
17. CHASMOCRANUS PERUANUS Eigenmann and Pearson, sp. nov. 
Plate ITI, figs. 3 and 4 
15869, 2, cotypes, 60 and 63 mm., Puerto Melendez below Pongo de Manseriche, Rio Maranon, 
Allen, October, 1920. 
Related to C. longior from which it differs in possessing a deeply forked caudal, 
a narrower head, and longer barbels. 
Head 4.66—4.8; depth 8 and 9; D. 7; A. 10; eye 4.25 and 5; width of the head 
