﻿ICHTHYOLOGICAL RECONNAISSANCE OF COLOMBIA 



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quite different from those of G. chocoensis, the bases of the two first dorsal 

 rays are blackish, the pectorals instead of being falcate, as in chocoensis, 

 have the tips of the second and sometimes of the third ray expanded, 

 usually the tip of second ray is black, sometimes there are supplementary, 

 smaller black dots near the larger; ocellus-like black tip. 



Ten males from Bernal Creek have the black pectoral tip ; only one of 

 the three males from Soplaviento have the tip of the pectoral black ; the 

 pectorals in males are longer than in the other twoi species of the genus, 

 sometimes quite reaching the anal, the lower modified fulcra of caudal are 

 also different, the lower one of the two modified fulcra is slender and curved, 

 its upturned tip only in contact with the tip of the heavier downcurved 

 second fulcrum ; the fulcra not covered with scales, but the scales at base 

 of lower caudal lobe united and free from the caudal, leaving a pouch be- 

 tween them and the caudal. 



Type, male, 44 mm., Bernal Creek, CM. No. 4839. 



Paratypes, nine males, fourteen females, largest 46 mm., Bernal Creek, 

 CM. No. 4840 a-f, I.U.M. No. 12696 a-f. 



Paratypes, three males, four females, largest 48 mm.. Soplaviento, CM. 

 No. 4841 a-e, I.U.M. No. 12697 a-c. 



27. Thoracocharax brevis sp. no v. 



Allied to Th. maciilatus (Steind.) but much shorter. 



Head 3.5 ; depth 1.6; D. 10 ; A. 31; 31 scales in a median series, eye 

 7 in snout, 3 in head, 1.4 in interorbital. 



Outer row of permaxillary teeth consisting of a single tooth ; three 

 teeth on the maxillary, the proximal one much the largest. 



Margin of pectoral disk black ; a dark lateral band, fainter bands par- 

 allel to it along the rows of scales above and below it, the chromatophores 

 on every second or third scale conspicuous, forming vertical series of 

 spots. 



Type, 47 mm. Ptaspadura, CM. No. 4845. 



28. Thoracocharax magdalense sp. nov. 



Head 4; depth 1.66; D. 10; A. 34; 33 scales in a median series; eye 

 1 in snout, 3 in head, 1.4 in interorbital. Outer row of premaxillary teeth 

 consisting of a single tooth ; three or four teeth of nearly equal size along 

 the maxillary, the last near its tip. 



Margin of pectoral disk dusky, a narrow black spot along the back at 

 the base of the dorsal ; a dark lateral strip and fainter ones along the rows 

 of scales above and below it ; tip of dorsal narrowly black. 



Type 50 mm., Girardot, CM. No. 4846. 



Paratype, 53 mm., Girardot, I.U.M. No. 12700. 



29. Characidium caucanum sp. nov. 



Charaddium fasciatum was originally described from the Rio das 

 Velhas in eastern Brazil. It has since been reported from Paraguay, the 

 Essequibo, the Orinoco and from Canelos Ecuador. I found it abundant at 

 Raspadura. I took no- specimens of the genus Characidium except at 



