CENTROPOMUS. AQ 
Here described from five specimens, 200-300 mm. in total length, from Pernambuco, 
the Rio Chagres, and the Rio Tonto, Southern Mexico. 
4, Centropomus undecimalis. 
Sciena undecimalis, Bloch, Ausl. Fische, vi. p. 60, t. 203 (1792) '. 
Platycephalus undecimalis, Schneid., Bloch’s Syst. Ichthyol. i. p. 59 (1801). 
Centropomus undecimradiatus, Lacep. Hist. Nat. Poiss. iv. p. 268 (1802) *. 
Perca loubina, Lacep. t. ec. p. 418 *. 
Sphyrena aureoviridis, Lacep. 0. c. v. p. 827, t. 9. fig. 2 (1808) °. 
Centropomus undecimalis (part.), Cuv. & Val. Hist. Nat. Poiss. ii. p. 102, t. 14 (1828) °; Ginth. 
Cat. Fish. i. p. 79 (1859) *; Boulenger, Cat. Fish. i. p. 367 (1895)°; Gilb. & Starks, Mem. 
Calif. Ac. Sci. iv. 1904, p. 89°. 
Centropomus undecimalis, Guichen. in Ramon de la Sagra’s Hist. Cuba, Poiss. p. 9 (1853) ”; 
Vaill. & Boc. Miss. Sc. Mex., Poiss. p. 17, t. 2. fig. 1 (1874) "'; Steind. Denkschr. Ak. 
Wien, xxxix. 1878, p. 21; Jord. & Gilb. Syn. Fish. N. A. p. 528 (1882) "*; Everm. & 
Kendall, Bull. U.S. Fish. Comm. 1892, t. 37 (1894); Jord. & Everm. Bull. U.S. Nat. 
Mus. xlvu. 1896, p. 1118 ™. 
Centropomus appendiculatus, Poey, Mem. Cuba, ii. p. 119 (1860) **, and Repert. ii. p. 280 (1868) ””. 
Centropomus appendiculatus (part.), Giinth. Trans. Zool. Soc. vi. 1868, p. 406™. 
Centropomus parallelus (part.), Bouleng. t. c. p. 8369". 
? Centropomus constantinus, Jord. & Everm. t. c. p. 1125”. 
Centropomus argenteus, Regan, Ann. Mag. Nat. Hist. (7) xiii. 1904, p. 260”. 
Depth of body 33-43 in the length, length of head 22-24. Snout 13-2 as long as eye, the diameter of which 
is 6-83 in the length of head; interorbital width 8-9 in the length of head. Maxillary extending to 
below middle or posterior edge of eye, its greatest width 3-4 the diameter of eye. Praorbital weakly 
serrated; preoperculum acutely serrated, the serree enlarged at the angle; 1 or 2 feeble spines at angle 
of preopercular ridge. Opercular flap not reaching the vertical from origin of dorsal. 8 or 9 well- 
developed gill-rakers and a few rudiments on the lower part of anterior arch. 67-75 scales in a 
longitudinal series, 7-83 between middle of second dorsal and lateral line. Dorsal VIII, I 10; third 
spine usually the longest, about 3 the length of head. Anal III 6; second and third spines subequal 
in length, the second sometimes slightly the longer, {1 the length of the fish. Pectoral 2 or a little 
more than 3 the length of head. Ventrals not reaching vent, which is situated at more than 2 of the 
distance from base of ventral spine to origin of anal. Caudal peduncle 13-2 as long as deep. Silvery or 
golden, back greenish ; lateral line usually blackish ; spinous dorsal dusky. 
Hab. Atlantic Coasts of Tropical America, ascending rivers : 
Mexico’; British Honduras, Belize 1!; Panama, Rio Chagres (Salvin 7 8 18), — 
Cubat0l16l; Waitiol; Jamaica!?78; Porto Rico!!; Martinique®; Barbados!92!; 
British Guiana !9?1; Cayenne*; Bahia2°; Rio Janeiro. 
Here described from six specimens, 230-600 mm. in total length, from Jamaica, 
Mexico, the Rio Chagres, and Rio Janeiro. The small examples from Barbados and 
Guiana, referred by Boulenger to C. parallelus and described by me under the name 
of C. argenteus, prove to be young individuals of this species. 
BIOL. CENTR.-AMER., Pisces, february 1907. H 
