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INDIANA UNIVERSITY STUDIES 



ii. Scales 6-3S-5 ; head 3.GG ; maxillary tliree-foiirtlis as long as eye; 



eye greater than iiiterorbital. 



7. ortholepis Eigenmann. 



iii. Scales 0 (or 7) -39 or 40-5 or 0; head 4-4.6; maxillary three-fourths 



as long as eye; eye equals interorbital or not quite equal to it; 

 males with tubercles on head, tins and scales. 



S scopiferus Eigenmann 



hhh. Middle caudal rays black. 



j. D. 10 (rarely 9) ; eye 3-3.5 in the head, 1.1-1.25 in the interorbital; 

 depth 2.9-3.25. 



9 caucanus Eigenmann. 



jj. D. 11; eye 3.1-3.5 in the head (2.75 in the young), 1.2-1.4 in the 

 interorbital; depth 2.5-2.8 (3.25). 



10. peruanus iMiiller and Troschel ) 



gg. Origin of dorsal an orbital diameter nearer the snout than to the 

 base of the middle caudal rays. (Costa Rica and Ecuador.) 

 k. Eye equals the interorbital ; A. 2S-31 ; scales 7-39 or 40-6. 



11. ricae higenmann 



kk. Eye 1.3-1.5 in the very convex interorbital. A. 28 or 29; scales 

 7-37 to 39-6. 



)-. scleroparius (Regan.) 



ff. Maxillary with 2 to 11 teeth.* 



I. Lateral line sagging but little, a line drawn from origin to end of 



lateral line passing below the dorsal through the middle of the 

 first row of scales above it ; scales not deflected toward the anal ; 

 pectoral not reaching ventrals; depth 3-3.5; A. 21-25; scales 6 or 

 7-41 to 43-5 or 6; eye 1.3-1.5 in interorbital; mandibulary teeth 

 nearly regularly graduate. 



13. tolimse Eigenmann. 



II. Lateral line sagging so that a line connecting its origin and end 



passes under the dorsal through the middle or upper corner of the 

 second row of scales above it ; scales deflected towards the anal ; 

 pectoral reaching ventrals. Bye equals interorbital ; origin of 

 dorsal under middle or anterior part of dorsal, 

 m. Scales 7 or S-45 to 4S-5 or 6; depth of caudal peduncle less than its 

 length; depth 3.2-3.4; A. 30-34; maxillary teeth 3-9, usually ex- 

 tending over less than half the free margin. 



!4 dentatus Eigenmann. 



3. See also B. boquise 16. 



