1374 Bulletin ^7, United States National Museum. 



del. Body rhomboidal, short and deep, with angular outlines, the depth 

 usually more than J length ; spines long and slender ; second dorsal 

 spine I or more length of head ; second anal spine more than J 

 length of head. peruvianus, 1752. 



cc. Premaxillary groove broad, oval, and covered with scales (these some- 

 times deciduous in poorly preserved specimens). Anal rays III, 8; 

 second dor.sal spine IJ in head; second anal spine Ig in head; teeth 

 rather long and slender. olisthostomus, 1753. 



GeRBES : 

 aa. Preorbital serrate ; a distinct dark streak along each row of scales on back and 

 sides; body rhomboidal, with angular outlines; spines very strong; anal rays 

 III, 8 or 9- 

 e. Scales moderate or large, 34 to 39 in lateral line. 



/. Spines moderate, the second dorsal spine | to J length of head. 



g. Pectorals short, barely reaching vent ; second dorsal spine If in head ; 

 caudal shorter than head; lateral stripes few; depth about 2| in 

 lengtli ; '19 sc.iles in lateral line. brevimanus, 1754. 



gg. Pectorals long, nbout as long as head; caudal longer than head ; sides 

 with iiuiueidus dark streaks along the rows of scales; body deep, 

 the back elevated, the depth 2 to 2J in length; dorsal and ventrals 

 more or less dusky. 

 h. Pectorals as long as head, not reaching front of anal, 3 to 3J in 

 body; scales 38; longest dorsal spine IJ in head. 

 i. Third dorsal spine rather longer than second; 10 rows of 

 scales between lateral line and vent; opercle with few if 

 any small scales at base. lineatus, 1755. 



a. Third dorsal .spine not longer than second ; 11 rows of 

 scales between lateral line and vent; opercle with 

 numerous small scales at base. brasilianus, 1756. 



hh. Pectorals very long, J longer than head, 2 J to 2J in body; sec- 

 ond dorsal spine longest, 1 J in head ; scales 35. 



EMBEYX, 1757. 



//. Spines very high, the second dorsal spine longer than head ; second anal 



spine about equal to length of head ; lateral stripes very distinct, about 



12 in number; depth of body 2^ in length; pectorals very long, 2| in 



body; scales 37. plumieri, 1758. 



ee. Scales small, 44 in lateral line. Second dorsal spine about as long as head ; 



depth of body 2* in length; lateral stripes faint. MEXicanus, 1759. 



Subgenus MOHARRA, Poey. 

 1750. GERRES RHOMBEUS, Cuvier & Valenciennes. 

 Head 3J; depth 1^; eye 3J in bead; snout 4; interorbital width 3}; 

 scales 5-38-10. D. IX, 10; A. II, 9. Body much compressed, rhomboidal 

 iu form, the back much elevated; profile evenly convex to supraorbital, 

 where there is a slight depression ; snout somewhat pointed ; month rather 

 large; end of maxillary reaching to vertical from center of pupil, its 

 length 3 in head; exposed portion of maxillary oblong, its width about 

 2| in its length, which is 4^ in head; gill rakers stronger than iu guJa 

 or olisthosfomiis, 18 below angle; premaxillary groove broad, oval, and 

 free from scales; pectoral fins reaching to front of anal, their length 3 in 

 length of body; ventral tins reaching beyond vent, their length 4J in 

 length of body; second dorsal spine stronger, but shorter than third 

 and fourth, its length about 4 J in length of body; margin of fin falcate; 

 suborbital entire; preopercle entire; caudal peduncle 2| in length of 



