EIGENMANN: the freshwater fishes of BRITISH GUIANA 409 



Acestrorhynchus microlepis Eigenmann, Repts. Princeton Univ. Exp. Patagonia, 



III, 1910, 447. 



I have examined a specimen in the Berlin Museum and: 



Seventeen specimens, 86-222 mm. Crab Falls. (C. M. Cat. No. 1975a-e; 

 I. U. Cat. No. 12223.) 



One specimen, 148 mm. Creek below Potaro Landing. (C. M. Cat. No. 

 1976a.) 



Four specimens, 99-146 mm. Malali. (C. M. Cat. No. 1977a; I. U. Cat. 

 No. 12336.) 



Six specimens, 106-107 mm. Botanic Gardens. (C. M. Cat. No. 1988a-c; 

 I. U. Cat. No. 12224.) 



Five specimens, 90-156 mm. Maduni Creek. (C. M. Cat. No. I979a-b; 

 I. U. Cat. No. 12225.) 



Three specimens, 116-134 mm. Georgetown trenches. (C. M. Cat. No. 

 1980a-6; I. U. Cat. No. 12226.) 



Two specimens, 86-110 mm. Wismar. (C. M. Cat. No. 1981a; I. U. Cat. 

 No. 12227.) 



One specimen, 47 mm. Erukin. (C. M. Cat. No. 1982a.) 



Ten specimens, 104-162 mm. Tumatumari. (C. M. Cat. No. 1983a-c; I. U. 

 Cat. No. 12228.) 



Seventeen specimens, 74-168 mm. Rockstone sand-bank. (C. M. C'at. No. 

 1984a-e; I. U. Cat. No. 12229.) 



Three specimens, 207-270 mm. Lama Stop-Off. (C. M. Cat. No. 1985a-6; 

 I. U. Cat. No. 12230.) 



One specimen, 200 mm. Issorora Rubber Plantation. (C. M. Cat. No. 

 1986a.) 



Five specimens, 85-242 mm. Konawaruk. (C. M. Cat. No. 1887a-d; I. U. 

 Cat. No. 12231.) 



Head 3.4-3.8; depth 5-6.5; D. 11; A. 28-33, most frequently 32 or 33; 

 scales 93-95 in specimens from the Georgetown trenches, 113-114 in those from 

 Crab Falls, and 101-105 in those from Lama Stop-Off; eye 1.8 in the snout, 4.5 

 in the head, 1.1 in the interorbital ; 1.7, 4, .7, respectively in the young. 



Readily distinguished by a small black spot on the shoulder-girdle in front of 

 the origin of the lateral line; a circular caudal spot. Dorsal, upper caudal lobe, 

 and adipose orange; lower caudal band yellow in the specimens from Maduni. 



Dr. Ellis took one specimen in brackish water at Georgetown. 



