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INDIANA UNIVERSITY STUDIES 



Astyanax aurccaudatus sp. nov. 



Type GO iiuii. CM. No. r)l(;2. 



Paratyijes. i), largest (!U iiiiii.c Btxiiiia. CM. No. 5163 a-d ; I.U.M. No. 

 12911. 



Head 3.5-3.75; depth 2.(;-2.T5 ; D. 10: A. 21; scales 7-35+2-5; eye .8-1 

 ill snout, 3.5-3.S in head; interorbital 3 in head; depth of caudal peduncle 

 less than lialf the length of the head ; l)ase of anal 3-3.5 in the length. 



Deep, compressed, hluiif headed ; predorsal area keeled, with al)out 12 

 median scales; occipital process narroAV. reaching a little mare than a 

 sixth of the way to the dorsal, bordered by ab ut three scales ; he;ul in the 

 occipital region much arched, the fontanels narrow, the frontal ijntanel 

 very short, only about one-fourth as long as the parietal without its 

 groove ; second suborbital very small, usually narrower than the iitilved 

 portion of the cheek, cheek very deep ; the vertical limb of the preopercle 

 extending downward and backward, the angle acute ; lower jaw included, 

 short, but a tri.le longer than the eye; maxillary-premaxillary border a 

 simple curve, 2.75 in the length of the head ; snout very short and blunt. 

 l*remaxillary with live teeth in the outer series in a wavy line ; four teeth 

 in the inner series, the second one being much the heavier ; maxillary with 

 several (5 or 0) teeth of nearly equal size along more than half its margin; 

 mandible with three large, graduated teeth, the middle point of the third 

 one recurved, thorn-like ; about seven small graduated teeth on the side 

 of the jaw. 



Gill-ralvers of the lower arch reduced to about five minute scarcely 

 evident papillae. 



Origin of dorsal about midway between snout and caudal ; its base a 

 little less than half the length of the head ; its margin obliquely truncate, 

 the liighest ray a little more than twice the length of the penultimate. 

 Adipose well developed; caudal lobes a little l?ss than length of head; 

 origin of anal equidistant from snout with the anterior part of the dorsAl ; 

 ventrals reaching the anal ; pectorals beyond the origin of the second third 

 of the ventrals. equal to length of head without the opercle. 



Scales regularly imbricate (except over the anterior anal rays?) ; 

 caudal naked ; anal in the type at least with a lobe composed of two 

 rows of scales on the base of the anterior seven rays, these are not at- 

 tached to the rays ; lateral line nearly straight. 



A large ill-defined vertical humeral blotch ; no caudal spot ; dorsal and 

 pectoral blackish. (In life the whole after part of the body and caudal 

 peduncle golden or orange red.) 



These specimens were damaged in transportation but the third man- 

 dibulary tooth, the small second suborbital and color readily distinguish 

 the species from the other members of the genus Astijanax from which 

 it ought probably to be distinguished geiierically. 



Brycon henni sp. nov.* 

 Type, 247 mm. Caldas. CM. No. 5152. 



Paratypes, 21. largest 270 mm. Caldas. CM. No. 5153 a-f ; I.U.M. 

 No. 12902 a-e. 



Paratypes, 4. 235, 240, 290 and 325 mm. ; 6, 60-107 mm. ; 18, largest 50 

 mm. Cisnero. CM. No. 5154 a-o; I.U.M. No. 12903. 



*For Arti ir Hean, at the prese it mameat exploring the rivers of Western Colombia. 



