132 Annals of the Carnegie Museum. 



depth a little more than 2 in the length. A. 27; scales 5-31-4. (See 



also under bimaculatics.) steindachneri (Eigenmann) 21. 



vv. A single lateral band or none. 

 w. Caudal without vertical band. 

 x. Scales 28-35. 



y. A caudal spot. 



2. Humeral spot horizontally oval. 



A. Lateral band black. (See also bi/naculatus.) Scales 



in 14 rows. Dorsal fin behind the base of the ven_ 

 trals. Maxillary with one tooth extending a little 

 beyond the anterior border of the eye ; interorbital 

 space much greater than the eye. Head 3% ; 

 depth 3 ; A. 28 ; scales 7-34-6. 



wappi (Cuvier & Valenciennes) 22. 

 zz. Shoulder spot if present vertically elongate, sometimes faint. 



B. Caudal spot band-like, continued on the middle caudal 



rays; scales in less than 15 rows. 

 C. A humeral spot. 



D. Dorsal behind the ventrals. 



E. Maxillary with 2-7 teeth ; anal 27-32; 

 depth 2^-3 ; head about 4 ; maxil- 

 lary equal to eye ; eye 3 in head, 

 equal to interorbital. Scales 7-37-6. 

 rutilns nicaraguensis Eigenmann 



23- 

 EE. Maxillary with 0-2 teeth. 



F. Head 4, or more than 4, in the 

 length. A band-like caudal 

 spot sometimes extending for- 

 ward to the indistinct humeral 

 spot. Maxillary extending dis- 

 tinctly beyond the anterior mar- 

 gin of the eye. Head 4-4^ ; 

 depth 2.25-3 ; A. 25-30 ; scales 

 6 or 7-30 to 39-4)4 to 6. 



rittihts 10 (Jenyns) 24. 

 EE. Caudal bordered above and below 

 by yellow ; a silvery lateral 

 band ; a humeral spot ; head 

 not 4 in thelength. A. 27-35. 

 Scales 7-38-7. Maxillary 

 with a single tooth. 



ticniurus (Gill) 25. 

 FFF. A. 24-32 ; origin of the dorsal 

 behind the base of the ven- 

 trals ; maxillary reaching an- 

 10 Rutilns jequitinhonha has depth 3. 



