84 BULLETIN 95, UNITED STATES NATIONAL MUSEUM. 



Head 2.93 in length ; depth 2.8 to 2.87 ; eye 3.52 to 3.91 in head ; 

 snout 3.15; maxillary 3.35 to 3.4; interorbital 4 to 4.27; pectoral 1.08 

 to 1.14; third dorsal spine longest, 1.88 to 2.07; D. XII, 13 to 15; 

 A. Ill, 8; scales 6 or 7-53 (+2)-ll. 



Body stout, compressed, back strongly arched ; ventral outline less 

 strongly curved than back; head moderate, pointed; mouth small, 

 oblique, maxillary scarcely reaching vertical from front of eye; 

 preorbital two-thirds diameter of eye; eye large, nearly as long as 

 snout, wider than interorbital ; preopercle finely serrated ; gillrakers 

 long and very slender, 6+13. First dorsal spine very small, third 

 longest; fin not notched; caudal forked; anal spines weak, slender, 

 third longest; ventrals moderate, shorter than pectorals; pectoral 

 nearly as long as head, tip reaching to base of first dorsal ray. 



Color in alcohol : Dark silvery brown ; centers of scales dusky black, 

 forming lines along the rows of scales, these lines most distinct below 

 lateral line; a large blackish blotch on shoulder at origin of lateral 

 line; opercle blackfish; fins brown. 



Gilbert and Starks give the following measurements for four 

 specimens from Panama : 



Head 3 to 3.25 in length; snout 3 to 3.25 in head; eye 4 to 4.2; 

 interorbital (bone) 5; scales 48 to 50; dorsal rays 14 or 15; anal rays 

 8 or 9 ; upper caudal lobe conspicuously longer than lower lobe. 



Gulf of California to Mazatlan, Panama, and southward to Peru. 



113. BRACHYDEUTERUS LEUCISCUS (Gunther). 

 RONCADOR; RONCADOB DE AGUA DOLCE. 



Pristipoma Iciiciscus Gunther, Proc. Zool. Soc. London, 1864, p. 147; San 



Jose de Nicaragua, Chiapas. 

 Pristipoma leucisciis var. elongatus Steindachneb, Neue und Seltene Fisch- 



Arten. Denljsclir. Akad. Wiss. Wien, vol. 41, 1879, pp. 30, 52, pi. 9, 



fig. 2; Tumbes. 

 Bracliyde uterus leuciscus Jordan and Evermann, Fishes North and Mid. 



Amer., vol. 2, 1898, p. 1327. — Gilbert and Starks, Fishes of Panama 



Bay, Mem. California Acad. Sci., vol. 4, 1904, p. 109. 

 Potnadasis Icncisctis Regan, Biologia Centrali-Americana, Fishes, p. 42, 



1906 (1906-1908). 



One specimen, field No. 1012, 21.5 cm. long, from mouth of Tumbes 

 River, Tumbes, taken with a casting net. 



Two specimens, field No. 1028, 12.2 and 13.2 cm. long, from Capon 

 (Tumbes). 



Head 2.69 in length; depth 2.96; eye 4.64 in head; snout 2.42; 

 maxillary 3.51 ; interorbital 4.48 ; pectoral 1.35 ; preorbital wider than 

 eye, 4.33 ; third dorsal spine longest, 2.09 ; second anal spine longest, 

 3.82; D. XII, 15; A. Ill, 8; scales 7-51 ( + )-13. 



Body moderately elongate, slender, compressed, dorsal outline 

 strongly arched ; ventral outline nearly straight ; head pointed ; snout 



