﻿ICHTHYOLOGICAL RECONNAISSANCE OF COLOMBIA 



9 



Creagrutus magdalenae var ? 



The followirg si;eeimens from the Magdalena basin have the number 

 of anal rays of affinis and the shape of ynagdalence. 



^Over Um. Bernal Creek near Honda. CM. No. 4882; I.U.M. 1272.3. 



^Over 40, largest 54 mm. Soplaviento. CM. No. 4886 a-t ; I.U.M. 

 12727 a-t. 



Creagrutus caucanus sp. nov. 



Type (a) and paratj'pes (b-g) 26, the largest 113 mm. Paila. CM 

 4895 a-g; I.U.M. 12738 a-g. 



Paratypes, 40, the largest 83 mm. Cauca at Call. CM. 4896; I.U.M. 

 12736. 



Paratypes, 2, 64 and 84 mm. Cartago. CM. 4897 a ; I.U.M. 12737 a. 

 Paratypes, 2. 33 and 50 mm. Cali. CM. 4898 a-b. 



Head 4-4.33 ; depth 3.5-3.75 : D. 10 : A. usually 14. sometimes 15 or 13, 

 raiely 12; scales 4-39 to 41-3; eye in largest specimens equals snout, 3.5 

 in the head, 1.33 in the interorbital ; in the smaller it is equal to the 

 interorbital, 3 in the head. 



Heaviest above middle of pectoral, tapering to a slender caudal 

 peduncle whose depth is one-half its length or one-half the length of the 

 head. Profile regularly arched to the dorsal ; preventral area broad, 

 rounded, predorsal area with nine or ten scales ; head smooth, convex 

 in cross section : occipital process short and pointed, about one-sixth of 

 the distance of its base from the dorsal : frontal fontanel much smaller 

 than the parietal ; angle of second suborbital an orbital diameter from 

 the eye ; naked area behind the second suborbital .4 as wide as the sub- 

 orbital. Snout pointed, in contact with the preoperculum along its entire 

 margin below. The premaxillary-maxillary border a simple curve, hori- 

 zontal extent of the premaxillary much shorter than the maxillary which 

 equals the eye: lower .1a^^' included, the first two teeth of the premaxillary 

 considerably in front of tlie margin of the lower jaw. Maxillary with two 

 or three multicuspid teerh ; lower jaw short, with three heavy teeth in front 

 and two graduated smaller ones on the side. Lower lip very thick. 



Gill-rakers 5+10. 



No scales on the anal, a sheath along its anterior half formed by 

 the scales of the sides : caudal lobes scaled for a little ways ; pores for a 

 A'jiriable distance from behind !)road. covered by a ^free flap of the lateral 

 line scale. This flap has the appearance of an accessory scale and dis- 

 tinguishes this species. A large axillary scale. 



Dorsal slightly emarginate or truncate, its highest ray about reaching 

 tip of the last, its origin nearer snout than caudal by one or two diam- 

 eters of the eye. Anal emarginate. its highest ray reaching to the base 

 of the penultim^ate ray or to the second fourth of the last. Tentrals 

 'reaching to or nearly to the anal, pectorals to or nearly to the ventrals. 



A bright silvery lateral band : a large humeral bar ; back dusky. 



1. Oi elev-en selected at raudom 'wo have 14 anal rays, nine have 13; two have 35 pores in the 

 lateral line, nine have 36. , 



2. The anal rays usually number 14 or 15, rarely 13 or even 12; the lateral line contains 35 or 36 

 scales, rarely 37. 



