eigenmann: fresh water fishes. 265 



I tooth, extending a little beyond the anterior border of the 

 eye to end of first suborbital ; interorbital space much 

 greater than the eye, very convex ; eye 4 in head. Head 

 3^ ; depth 3 ; A. 28. A humeral spot. 



21. wappi{<Zw. & Val.). 

 AAAA. Scales 7-36-7 ; maxillary extending to eye ; eye 3.66 in 

 head, much smaller than the convex interorbital ; A. 27-31 ; 

 anal and ventral with broad red margins. 



30. humilis, which see. 

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



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

 scales in fewer than 1 5 rows. 

 C. A humeral spot. 



D. Dorsal behind the ventrals. 



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

 2I-3' i head about 4 ; maxillary equal to eye ; 

 eye 3 in head, equal to intraorbital. Scales 



22. rutilus nicaraguettsis Eigenmann. 

 EE. Maxillary with 0-2 teeth. 



E. Maxillary extending distinctly beyond the 



anterior margin of the eye. Head 4-4^ ; 



depth 2.25-3 ; A. 24-32 ; scales 6 or 7-30 



to 39-4i to 6. 23. ruti/us^ (Jenyns). 



EF. Caudal band bordered by yellow above 



and below ; head not 4 in the length ; 



maxillaiy with a single tooth ; A. 27- 



35 ; scales 7-38-7. 



24. t(Bniiiri4S (Gill). 



EEE. A. 24-32 ; origin of the dorsal behind the 



base of the ventrals ; maxillary with 



from 0-2 teeth, reaching anterior 



border of the orbit ; head 4 ; depth 



2.25-2.75 ; scales 7 to 9-35 to 39-6 



or 7. 25. ruti/i/s (F/icus (Giiniher). 



EEEE. Depth 3.33; head 3.66; A. 29; scales 



7-37-5 ; maxillary long, equal to 



eye; eye 2.5 in the head; interor- 



bitals3.66. 26. a/z'ieri (Liitken). 



DD. Dorsal over ventrals ; snout less than 4 in head ; 



interorbital flattish ; A. 27, beginning behind the 



dorsal ; depth 3 ; head 4 ; lat. 1. 37. 



27. petciietisis (Giinther). 

 ' Rutilus jeqidtinhonhce has depth 3. 



