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INDIANA UNIVERSITY STUDIES 



Creagrutus brevipiniiis sp. rov 



Type (a), Paratyjies. GO. largest OG mm. Pieclra Moler. CM. No. 

 4887 a-i: I.U.M. 12728 a-li. 



Paratypes, 10. the largest about 57 mm. Paila. CM. No. 4889 a-li ; 

 I.U.M. 12730 a-h. 



Paratypes. 29, largest 55 mm. Cartago. CM. No. 4888 a-e; I.U.M. 

 12729 a-e. 



Closely related to (\ magdaleiuc : distinguished from the other species 

 of this genus in Colomhia by the small number of anal ra.ys and by the 

 shape. 



Head 4. depth 3.4-3.(1; D. 10; A. 10 or 11 (most frequently 11) ; scales 

 4-36 to 38 (rarely 35) -2.5; eye .8-1 in snout, 2.8-3 in head. .8 in interorbital. 

 Depth of caudal peduncle. 2+ in its length. 2.2-2.5 in the head. 



Heaviest below the front of the dorsal ; caudal peduncle slender ; 

 second suborbital in contact with the preopercle below, its greatest width 

 distinctly less than the diameter of the eye, the naked portion of tlie 

 cheek about one-third as wide as the suborbital. 



Dorsal emarginate. the highest ray reaching to tip of the last ray; 

 anal very similar to the dorsal, the highest ray reaching to or nearly to 

 tlie tip of the last. 



Silvery; a dark humeral bar. 



BRYCONAMERICUS Eigenmann 



Ken to the S[>ecies of Bnjconaniei iciis. found hctirccn Peru and Costa 

 Rica. 



a. Slender ; a brilliant lateral band ; a glandular scale on the base of 



the middle caudal rays of the m.ale overarching a cavity beneath 

 it ; hooks on the anal of the male confined to a circular patch cov- 

 ering part of the tenth-fifteenth (about) rays; lower caudal fulcra 

 in the male prominent, continuous in profile with the tips of the 

 anal rays. Anal with 33-45 rays. Caudal margined with dark. 



Argopleuia subg. nov. type inagdalenensls. 



b. Maxillary reaching suture between first and second suborbital, its 

 - tip frequently touching second suborbital. Scales 7 (rarelj^ 6)- 



42 to 45-5 ; A. 33-3(t ; lateral band shading downward ; numerous 

 cliromatophores between anal and lateral line, those near the anal 

 arranged along the interha^mals. 



1 conve'tus Rigenmann. 



bb. Maxillary not reaching suture between first and second suborbital. 

 No interpolated rows of scales ; lateral band sharjBly defined below, 

 c. Six scales between origin of dorsal and lateral line ; scales 6-41 to 

 43-5; A. usually 35 to 36, rarely 33 or 34, 37 or 38; base of 

 anal 2.66-2.75' in the length; head 4.8-5; de])th 3.9-4.2; a few 

 chromatophores half way between anterior part of anal and 

 lateral line ; chromatophores along base of anal rays. 



■-. diguensis Eigenmann. 



