134 Annals of the Carnegie Museum. 



cal from the pupil and end ot first 

 suborbital. Dorsal considerably be- 

 hind origin of ventrals ; pectorals 

 reaching beyond ventrals. Eye 

 about equal to the slightly convex 

 interorbital, 3 in the length of the 

 head. Depth 2^ ; head 3% J 

 A. 26 ; scales 6^-37 or 38-5 ; a 



humeral spot Carolines (Gill) 33. 



II. Head 4 or more in the length ; scales 5)4- 

 35-4. Anal, dorsal and caudal fins with 

 red markings ; scales in 9^ rows. 

 Caudal and humeral spots indistinct. 

 Head 4.2 ; depth 3.3 ; A. 26-27 ; scales 



S/4~35-4 .phcenicoplerus (Cope) 34. 



yy. No caudal spot ; a humeral spot. 



K. Maxillary with 3 small teeth ; eye 2.3 in the head ; snout 

 4.5, the fiattish interorbital 3; depth 2.66; head 3.6. 

 A. 28 ; scales 5-35-4 ; a silvery lateral band, a vertical 



humeral spot megalops Eigenmann 35. 



KK. Maxillary, with numerous minute teeth, extending be- 

 yond the front of the orbit. Snout shorter than eye ; 

 eye 2.8-3. A. 29-30 ; scales 5 or 6-32 or 33-4 to 5. 

 Head 3| ; depth 2)^-2)4 ; humeral spot elongate 



horizontally bahiensis (Steindachner) 36. 



KKK. Maxillary without teeth. Silvery band not edged 

 with green above ; origin of dorsal between ven- 

 tral and anal ; pectorals to origin of ventrals, ven- 

 trals nearly to anal. Head 4^ ; depth 3)4 '■> e ye 

 2 T 3 T in head ; D. 10; A. 27 ; scales 5-37-3. 



alburnus (Hensel) 37. 



xx. Scales 9-40 to 46-10. Longitudinal series of scales 20. Caudal 



and humeral spots generally absent ; origin of dorsal over root 



of ventrals. Width of interorbital greater than the diameter 



of the eye. Head 4; depth 3 ; A. 26-31. Interorbital very 



convex, 2% in head ; eye equals snout, 3% in head ; depth of 



caudal peduncle about ]A, of the depth... cordovce (Giinther) 38. 



xxx. Scales in 15 or 16 rows, 8-39 to 45-7 ; A. 28 or 29 ; head 



3.6 or 3.5 ; depth 2.7-3; eve ^ ar g e > 2.6-2.8; interorbital 



3.25 in head; maxillary as long as eye, with two narrow 



teeth ; dorsal behind origin of ventrals ; humeral spot faint, 



caudal spot distinct, not continued on middle rays. 



emperador Eigenmann & Ogle 39. 

 aaa. Anal rays 16-25, rarely 26 or 27 in fasciatus and ceneus ; 3 to 5 series of scales 

 below the lateral line in all but ceneus (6 or 7) and fasciatus (4)4 to 7)4). 

 L. Maxillary without teeth ; two or three scales below the lateral line. 

 M. No caudal spot. 



