146 



PROCEEDINGS OF THE NATIONAL MUSEUM 



specimens mentioned under plumieri that have the third anal ray 

 simple but cross striated. 



This modification of the third anal ray has been considered by 

 Meek and Hildebrand as of specific significance, but its occurrence 

 in other species causes me to cast serious doubt on its validity as a 

 dependable character when considered alone. However, in view of 

 the small series of specimens for certain species of Diapterus, I am 

 tentatively referring the above listed specimens to evermanni. 



Table 18. — Measurements made on certain species of Diapterus. (All measure- 

 ments expressed in hundredths of the standard length.) 



Characters 



Standard length in millimeters 



Length of head 



Postorbital length of head 



Diameter of eye 



Length of snout 



Tip of snout to rear of maxillary 



Width of bony interorbital space 



Greatest depth of body 



Least depth of caudal peduncle... 



Length of: 



Caudal peduncle 



Longest ray of pectoral 



Longest branched ray of pelvic fins. 



Longest branched ray of caudal fln. 



Second dorsal spine 



Third dorsal spine 



Second anal spine 



Third anal spine 



Tip of snout to: 



Dorsal origin 



Anal origin 



Pectoral insertion 



Pelvic insertion 



Length of: 



Base of dorsal fln 



Base of anal fin 



Pelvix spine 



Pelvic axillary scale 



Genus EUGERRES Jordan and Evermann 



Eugerras Jordan and Evermann, Proc. California Acad. Sci., ser. 4., vol. 16, 

 p. 506, 1927. (Genotype, Gerres plumieri Cuvier and Valenciennes.) 



la. Gill rakers on lower part of first arch usually 10; anal rays 111,7; second dorsal 

 spine a little shorter than head but a trifle longer than third dorsal spine 

 and about 3.5 in standard length; second anal spine equal to second dorsal 

 spine in length Eugerres brasilianus '" (Cuvier and Valenciennes) 



lb. Gill rakers on lower part of first gill arch usually 14 to 16; second dorsal spine 

 longer than third and longer than head, about 2% in standard length; 



» Not yet reported from Venezuela. 



