CENTEOPOMirS. 49 



Here described from five specimens, 200-300 mm. in total length, from Pernambuco, 

 the Eio Chagres, and the Rio Tonto, Southern Mexico. 



4. Centropomus undecimalis. 



Scicena undecimalis, Blocli, Ausl. Fisclie, vi. p. 60, t. 203 (1792) '. 



Platycephalus undecimalis, Sclmeid., Bloch's Syst. Ichthyol. i. p. 59 (1801)'. 



Centropomus undecimradiatus , Lacep. Hist. Nat. Poiss. iv. p. 268 (1802) ^ 



Perca loubina, Lacep. t. c. p. 418 "'. 



Sphyrcena aureoviridis, Lacep. o. c. v. p. 327, t. 9. tig. 2 (1803) '. 



Centropomus undecimalis (part.), Cuv. & Val. Hist. Nat. Poiss. ii. p. 102, t. 14 (1828) "; Giiiith. 



Cat. Fish. i. p. 79 (1859) ' ; Boulenger, Cat. Fisli. i. p. 367 (1895) " ; Gilb. & Starks, Mem. 



Calif. Ac. Sci. iv. 1904, p. 89 \ 

 Centropomus imdecimalis, Gnicliea. 'm Ramon de la Sagra's Hist. Cuba, Poiss. p. 9 (1853)'"; 



Vaill. & Boo. 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. xlvii. 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. 369'°. 

 ? Centropomus constantinus , Jord. & Everm. t. c. p. 1125 ''°. 

 Centropomus argenteus, Regan, Ann. Mag. Nat. Hist. (7) xiii. 1904, p. 260". 



Depth of body 3|-4J ia the length, length of head 2|-2t. Snout l|-2 as long as eye, the diameter of which 

 is 6-8g 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 g-A the diameter of eye. Prseorhital weaklv 

 serrated ; prseoperculum acutely serrated, the serraB enlarged at the angle ; 1 or 2 feeble spines at angle 

 of prteopercular 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|-8^ between middle of second dorsal and lateral line. Dorsal VIII, I 10 ; third 

 spine usually the longest, about | the length of head. Anal III 6 ; second and third spines subequal 

 in length, the second sometimes slightly the longer, ^J- the length of the fish. Pectoral ^ or a little 

 more than | the length of head. Ventrals not reaching vent, which is situated at more than = of the 

 distance from base of ventral spine to origin of anal. Caudal peduncle l|-2 as long as deep. Silvery or 

 golden, back greenish ; lateral line usually blackish ; spinous dorsal dusky. 



Hah. Atlantic Coasts of Tropical America, ascending rivers : 

 '•* Mexico ^ 8 ; British Honduras, Belize ^^ ; Panama, Rio Chagres (Salvin ^ ^ i»y — 



Cubaioi5i6i7. Haitian; Jamaicai278. Porto Rico"; MartiniqueS; Barbadosi^si. 



British Guiana ^^ -^ ; Cayenne '' ; Bahia -^ ; 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 



