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INDIANA UNIVERSITY STUDIES 



bb. Aui\] 12 : eye 8 to 3.66 in the head ; suborbital bones leaving almost 

 half of the cheeks uncovered : anterior edge of anal and outer 

 edge of ventrals white: caudal, dors.al and anal with more numer- 

 ous chromatophores than the pectoral and ventral. Humeral spot 

 and lateral band faded. Scales 4.5-38 to 40-3. Depth 3-3.5; 

 head 4. 



2. peruanus Steindachner. 



bbb. Anal 14; eye 4 in the head; suborbital as wide as eye. touching the 

 lower preopercular limb but not the angle ; a more or less distinct 

 blackish band runs from a black humeral spot to the middle of 

 the root of the caudal fin. Scales 5-39-3. Depth 3.33 ; head 4. 



3. mulleri Giinther. 



aa. Premaxillary with an inner series of three or four teetli ; a series of 

 four or five teeth extending obliquely from the third of the inner 

 series to the foremost tooth: a tooth lateral to the fourth tooth 

 of this series from in front, another tooth in the angle between 

 the inner series and the oblique outer series. 



c. Pores of the lateral line alilve. normal. 



d. Second suborbital not as wide as eye, leaving a narrow naked area ; 



A. 13 ; scales 4-40-3. 



* 4. beni Eigenmann. 



dd. Second suborbital as wide as or nearly as wide as eye, in contact 

 with the preopercle below, leaving a naked area behind. 



e. A. 10 to 11 : depth about 3.5: Lat. 1. 36-38: eye a little greater than 



snout ; caudal peduncle more than 2 in the head. 



5 brevipinnis Eigenmann. 



ee. A. 12 or 13, occasionally 11. rarely 10 or 14; Lat. 1. 33-36; depth 

 2.75-3.25 ; depth of caudal peduncle 1.6-2 in the head. 



6. magdalenae Eigenmann 



eee. A. most frequently 14. rarely 15, more rarely 12; Lat. 1. 33-36; depth 

 3.1-3.6; depth of caudal peduncle 2 in head. 



7. affinis Steindachner. 



cc. Pores of the posterior part of the lateral line broad, slit-like, cov- 

 ered by a scale-like flap; first tooth of the premaxillary placed 

 well in advance of the rest, the median toothless space of the 

 premaxillary bordered by four teeth on each side; A. 13-15; 'Lat. 

 1. 39-40. 



8. cauca'AUS Eigenmann. 



e 



