THE SHORE FISHES OF PERU 123 



SCIADES TROSCHELn Gill 



Sciades troschelii Gill. 1863c, p. 171, Panama Bay (original description). 

 Galeichthys troscheli Tortonese, 1939b, p. 230, Callao, Peru. 



This species was recorded from Callao from a single specimen taken 

 by the Magenta during her voyage around the world (1865-68). It 

 has not been taken in Peru b.y recent collectors. 



As only one species of the genus is known the generic characters, 

 namely, the enlarged dorsal shield, and the short broad occipital 

 shield, also distinguish the species. 



The following proportions and enumerations are based on seven 

 specimens from Panama Bay, 170 to 330 mm. long: Head in length 

 3.3 to 3.6; depth at origin of dorsal 4.5 to 5.2; dorsal spine 4.1 to 4.9; 

 pectoral spine 4.4 to 5.0; anal base 6.5 to 7.0; snout to origin of dorsal 

 2.45 to 2.6. Eye in head 5.75 to 7.5; snout 2.5 to 3.0; interorbital 2.0 

 to 2.3; adipose base 2.4 to 2.7. D.I, 7; A. 17 or 18; gill rakers 4 + 7 or 8. 



Range. — Guaymas, Mexico, to Callao, Peru. 



Genus GALEICHTHYS Cuvier and Valenciennes, 1840 



Galeichthys is characterized by its rather smooth head, mostly 

 covered with skin, sometimes with more or less exposed granular 

 plates. The teeth are pointed and arc present on the jaws, vomer, and 

 palatines, the ones on the palatines being in patches of moderate size 

 without backward extensions. 



KEY TO THE SPECIES 



a. Anal with 14 to 16 rays; mouth only moderately broad, its width at angles 

 1.95 to 2.1 in head; eye small, 7.0 to 7.2 in head; side with a silvery (some- 

 times slightly reddish) band, becoming obscure anteriorly. 



peruvianus (p. 123) 

 aa. Anal with 17 to 19 rays; mouth broader, its width at angles 2.5 to 2.7 in head; 

 eye larger, quite elongate, 5.75 to 6.25 in head; side without a band. 



jordani (p. 125) 



GALEICHTHYS PERUVIANUS LUtken 



Bagre 

 Figure 26 



Galeichthys peruvianus LIjtken, 1874, p. 205, Callao, Peru (original description). — 

 Steindachner, 1875b, p. 34, Callao, Peru; Panama Bay; and Altata, Mexico 

 (notes on abundance and relationship). — Evermann and Radcliffe, 1917, 

 p. 31, La Ventanilla, Peru (description). — Nichols and Murphy, 1922, 

 p. 506, North Chincha Island and Callao, Peru. — Tortonese, 1939b, p. 230, 

 Callao, Peru. 



Tachysurus peruvianus Eigenmann and Eigenmann, 1888, p. 140, Callao, Peru; 

 1890, p. 51, fig. 7 (teeth), Callao, Peru (description). — Fowler, 1941a, p. 369 

 (references). 



Head3.2to3.4;depth4.7 to5.1;D. I, 7; A. 14 to 16; P. I, 10 or 11. 

 Body scarcely deeper than broad at origin of dorsal, tapering poste- 

 riorly; caudal peduncle slender, its depth 3.8 to 4.4 in head; head 



