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INDIANA UNIVERSITY STUDIES 



Dorsal falcate, reaching to adipose ; pectorals reaching beyond origin 

 of second third of ventrals, ventrals to base of 8th anal ray; a faint, 

 diffuse humeral band; a very narrow lateral band. 



Astyanax microlepis sp. nov. 



Type, SS mm. Piedra Moler. CM. No. 5001. 



Paratypes, 4, 48-87. Piedra Moler. CM. No. 5002 a-b ; I.U.M. No. 

 12769 a-b. 



Paratypes, several hundred, largest 112 mm. Cartago. CM. No. 5(X)3 

 c.-z; I.U.M. No. 12770 a-z. 



Paratypes, 50, largest 408 mm. Paila. CM. No. 5004 a-j ; I.U.M. No. 



12771 a-j. 



Paratypes, 20, largest 99 mm. Cili. CM. No. 5005 a-j; I.U.M. No. 



12772 a-j. 



Paratypes, several hundred. Cauca near Cali. CM. No. 5006 a-z ; 

 I.U.M. No. 12773 a-z. 



Very siniilar to I'nciltii icJith iis cancan us St. and Astijaua.r faciatiis 

 Cuvier, from which it differs in the number of scales. 



Head 3.66; depth 2.8-2.2; D. 11: A. 22-25; scales 8 to 10-50 to 55-8 

 or 9 ; eye 3.33 in the head ; interorbital 3. 



Profile over eye depressed : preventral area narrow, flattened, without 

 a distinct median series of scales, about 17 scales in front of the ventrals; 

 postventral area narrowly rounded. Predorsal area narrow, bluntly 

 keeled. ^^ ithout a distinct median series of scales, about 13 scales in front 

 of the dorsal. Interorbital convex, smooth, occipital process about one- 

 fourth of the length from its base to the dorsal, bordered by four or five 

 scales along each side, usually a few small scales about its tip; frontal 

 fontanel narrow, triangular, not very nmch shorter than the parietal with- 

 out its groove; snout pointed, second suborbital narrower than the eye, 

 leaving a naked border around its entire margin ; mouth small, maxillary 

 not extending beyond origin of the eye; maxillary-premaxillary border 

 angulate. equal to half the length of the head without the opercle ; lower 

 jaw sliort, comparatively weak. 



Four or five teeth in the outer row of the premaxillary, five in the 

 inner, the lateral one minute; one tooth on the maxillary; five- or six 

 graduate teeth on the mandible in front and sometimes a few minute ones 

 on the side. 



Gill-rakers 7 + 12. 



Origin of dorsal about equidistant from caudal and snout, its height 

 4-4.5 in the length ; adipose well developed ; caudal lobes 4-4.33 in the 

 length ; origin of anal equidistant from caudal and origin or middle of 

 pectoral ; depth of caudal peduncle 1.25-1.33 in its length ; ventrals small, 

 1,5-1.66 in the length of the head; not reaching the anal; pectorals reach- 

 ing to or nearly to the ventrals, equal to head w.'thout snout, or a little 

 longer. 



Scales very regularly imbricate, the rows not deflected toward the 

 anal by interpolated rows ; caudal naked ; anal with a very narrow sheath 

 of one row of scales in front : a well developed axillary scale. Lateral 

 line but very little decurved. 



