322 MEMOIRS OF THE CARNEGIE MUSEUM 



Moenkhausia oligolepis Eigenmann, Repts. Princeton Univ. Exp. Patagonia, III, 



1910, 437. 

 Tetragonopterus agassizii Steindachner, " Ichthyologische Beitrage," v, 1876, 



41, pi. 8, fig. 2 (Tabatinga; Cudajas; Hyavary). 

 ? Astyanax atahualpianus Fowler, Proc. Acad. Nat. Sci. Phila., 1906, 436, fig. 36 



(Pebas). 



I have examined the specimen marked Tetragonopterus tamiatus in Berlin. 

 It is without doubt Moenkhausia oligolepis. I did not secure it along the coast, 

 where Schomburgk said it was found. 



Thirty specimens, 35-96 mm. Holmia. (C. M. Cat. No. 1361a-j; I. U. 

 Cat. No. 11835.) 



Eleven specimens, 39-118 mm. Aruataima Cataract. (C. M. Cat. No. 

 1362a-c; I. U. Cat. No. 11836.) 



Eleven specimens, 33-53 mm. Potaro River two hours below Holmia. (C. 

 M. Cat. No. 1363a-c; I. U. Cat. No. 11837.) 



Seven specimens, 28-44 mm. Savannah Landing. (C. M. Cat. No. 1364a-o; 

 I. U. Cat. No. 11838.) 



Three specimens, 37-61 mm. Erukin. (C. M. Cat. No. 1365o; I. U. Cat. 

 No. 11839.) 



One specimen, 88 mm. Potaro Landing. (C. M. Cat. No. 1367a.) 



Eight specimens, 40-47 mm. Tumatumari. (C. M. Cat. No. 1368a-6; I. 

 U. Cat. No. 11840.) 



One specimen, 78 mm. Maripicru. (C. M. Cat. No. 1369.) 



Abundant in the Potaro both above and below the Kaieteur Falls. 



Head 3.6-4; depth 2.25 on an average; D. 11; A. usually 25 or 26; scales 5-30 

 to 31-4; eye 2.5-3 in the head; interorbital wider than eye. A broad black band 

 across the end of the caudal peduncle and base of caudal; distal part of all the 

 caudal rays light; pink in life; a faint vertically oval humeral spot. 



176. Moenkhausia profunda sp. nov. (Plate XLVI, fig. 1.) 

 Type, 51 mm. Cloaca trenches, Issorora Rubber Plantation. (Carnegie 

 Museum Catalog of Fishes No. 2207.) 



Cotype, 51 mm. Same locality. (I. U. Cat. No. 12363.) 

 One of the most interesting catches of the expedition. The species differs 

 from Fowler ina orbicularis solely in the generic character, i. e., the absence of the 

 predorsal spine. It is in all probability a derivative of orbicularis as Fowlerina 

 was in all probability a derivative of the genus Moenkhausia. Of the known species 

 of Moenkhausia it approaches closest to chrysargyrea. 



