﻿ICHTHYOLOGICAL EECOXXAISSANCE OF COLOMBIA 



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ond suborbital iu contact with the preoiiercle along its lower limb : preven- 

 tral area compressed, the s ;ales cf rwij sides separated by a series of nar- 

 row median scales, rhe rnar^'inal S'-n.Ies of the two sides with their low?r 



margins ^rr;ii-:.^: 'l-i-;:! r;l'-::'-: -ir-r ventral rays filiform. 



Zygogaster nliferus sp. i n-. 

 Type, lli> mm. Apn:-. I.T'.AI. X,., 1l"s47. 



Head 4.25: dei rii 3; i>. n ; a. .;!s : srules T-3S-G ; eye 1- in snout. 3 in 

 head: intercrbital 2.9 in the head: depth of caudal peduncle equals its 

 length or the length of the postorbital portion of the head. 



Slender : ventral profile a nearly regular segment of a circle from the 

 mar-''.:-:- r.-, the end ' f the anal : d'"«rsal prr.file a little less rei^ular. less 

 deei'-v ^r-d. I'revtriitral area narr'jw. ri.iuiiilfl. wliii a yl-aw'W median 

 series of sca" - : -tventral area narrow: i rtdi rsai area ruunded. with 

 about six mt li; !- > -ales in front of the dorsal, and ab air six irregtilar 

 scales further forward. Occipital process unusually long and slender, its 

 length equal to nearly a third of the distance from its base to the dorsal : 

 interorbital very convex : snout pointed, mouth terminal : maxillary about 

 .6 as long - maxillary-premaxill'^ v l vdn-- erjual to the eye in 



length: gi*e:;-->" ••■■'-Irli .-.f the second • . ". nt rwr.-thirds of the 

 - " ' ' ' ' . ; v : - ■ ■ ■; . r:ue 



>iiltr. t;.^- :^ \. i:..- •: i'..^- " ::.;,.x:.::Lry. 



One tooth en the mfixillary. four large teeth in the mandible in front, 

 minute ones on the sides. 



Scales regularly imbricate except over the anal muscles where they 

 are much smaller and the rows are deflected toward the anal; caudal 

 naked : anal with a sheath of a single series of scales which are con- 

 tinuous with those above its base; axillary scale long: l ^Avt^r i, of 

 scales of the sides with their ventral margin straight, ih' -t- ixl two 

 sides nearly meeting in front of the venti'als : a narrow median series be- 

 tween them. 



Origin of dorsal an orbital diameter nearer tip of snout than end of 

 last scale of the lateral line : the second ray prolonged in a filament, 3.33 

 in the length : caudal deeply forked, the lobes about 3.5 in the length. : 

 anal Ipw. but little emarginate. its origin equidistant from middle of eye 

 ' and end of last scale of the lateral line, on the vertical from the last 

 drr-- ; 1: V : - - - - ' ; L reaching to base of fifth anal ray; 



pO' t' r; > :.: _ i: - . - : ^-j a i ' :';j:iu of ventrals. 



Easily .li-ti: - > ■ •[ '<y the li'if'-rm dorsal and ventrnls : the position 

 of the dvrsal: tlie r: ^ >-eth iu the inner series of the premaxillary and 

 the peculiar sealing of ihe preventral and predorsal areas, as well as by 

 the small scales covering the anal musculattire. 



The type is a male with retrorse hooks along the first ten anal rays. 



Astyanax daguae >]>, cov. 

 Type. mil!, •■'a'd-";. i '.M. X- . 'n'l:. 



Head 3.75: dei'tli 2.4: !>. 11: A. : scales S-35-T : eye 2.5: inter- 

 orbital 3. 



Premax!" ^^eth i i- maxillary teeth -4: mandibulary 5-5 and ab- 

 ruptly mim:r . ,,n the sides Origin of dorsal imder base of fourth 

 dorsal ray. 



