138 PROCEEDINGS OF THE NATIONAL MUSEUM vol. m 



2a. Air bladder ending posteriorly in a median extension reaching backward and 

 downward into a cavity in the anterior interhaemal bone, which is funnel- 

 or spoon-shaped; depressed area over premaxillary processes longer than 

 wide, crossed by scales in front leaving a naked pit behind, or open and 

 narrowly U-shaped and sometimes slightly restricted by scales in front. 

 Sides of body without vertical dark bands. 



Eucinostomus Baird and Girard 



2b. Air bladder ending posteriorly in a pair of diverticula extending backward 



on each side of the anterior interhaemal bone, which is simple; depressed 



area over premaxillary processes about as long as wide, always open and 



broadly U-shaped; sides of body crossed by vertical irregular dark bands. 



Qerres Cuvier 

 16. Preopercular margin serrate; second dorsal spine longer than distance be- 

 tween tip of snout and posterior margin of orbit; second anal spine about 

 equal to or longer than caudal peduncle, less than 6 in standard length; 

 greatest depth of body 1.7 to 2.4, usually 1.8 to 2.3 in standard length; 

 maxillary reaching to or beyond vertical from anterior margin of pupil; 

 air bladder ending bluntly, without posterior diverticulum or median 

 extension; anterior interhaemal bone simple. 

 3a. Sides of body without longitudinal black stripes; preorbital entire; second 

 anal spine shorter than anal base; its length 2.2 to 3.2, usually 2.3 to 3.1 

 in greatest depth of body; greatest depth of body 1.7 to 2.1, usually 1.8 

 to 2.0 in standard length; anal base 3.8 to 4.5, usually 3.9 to 4.4 in stand- 

 ard length; last dorsal spine 2.0 to 4.0 in anal base; eye 2.0 to 2.8, usually 



2.1 to 2.7 in anal base Diapterus Ranzani 



36. Sides of body with longitudinal black stripes; preorbital serrate except in 

 young; second anal spine longer than anal base, its length 1.4 to 2.4, 

 usually 1.5 to 2.3 in greatest depth of body; greatest depth of body 1.9 

 to 2.5, usually 2.0 to 2.4 in standard length; anal base 4.5 to 6.0, usually 

 4.6 to 5.9 in standard length; last dorsal spine 1.4 to 1.9 in anal base; 

 eye 1.4 to 2.1, usually 1.5 to 2.0 in anal base. 



Eugerres Jordan and Evermann 



Genus EUCINOSTOMUS Baird and Girard 



Eucinostomus Baird and Girard, in Baird, Rep. Smithsonian Inst, for 1854, 

 p. 334, 1855. (Genotype, Eucinostomus argenteus Baird and Girard.) (Ref. 

 copied.) 



I am very grateful to Luis Rene Rivas for the identification of the 

 specimens reported upon under this genus and for permission to print 

 his key to the West Indian species of Eucinostomus. 



la. Anterior interhaemal bone funnel-shaped; maxillary longer than second anal 

 spine, about equal to or greater than diameter of eye, about equal to or 

 greater than least depth of caudal peduncle; second anal spine more than 

 2.6 in head, shorter than distance between tip of snout and center of eye; 

 snout about equal to or longer than second anal spine; pectoral fin naked. 

 2a. Funnellike cavity in anterior interhaemal bone more conspicuous, about 4 

 times as long as wide, the lateral ridge low and not reaching to lower- 

 most part of edge of funnel; anal rays III, 7; greatest depth of body 2.3 

 to 3.2, usually 2.4 to 3.1 in standard length. 

 3a. Gill rakers 7 on lower limb of first arch (not counting rudiments or gill 

 raker at angle) ; maxillary more than 2.3 in distance between posterior 

 tip of premaxillary process and origin of spinous dorsal fin, usually less 

 than perpendicular distance between origin of spinous dorsal fin and 



