eigenmann: the FRESHWATER FISHES OF BRITISH GUIANA 265 



Scales cycloid, crenate on preventral area, with two or three diverging strise; 

 lateral line straight, complete; fins naked. 



Fins small; highest dorsal ray about 4 in the length, its origin equidistant 

 from snout and end of adipose; caudal a little longer than dorsal; anal emarginate, 

 the first ray reaching beyond the tip of the last ray; ventrals reaching vent or 

 shorter; pectorals to within three scales of ventrals. 



Highly iridescent, with a variable black spot at end of caudal peduncle. 



122. Curimatus microcephalus Eigenmann and Eigenmann. (Plate XXXIV, 



fig. 2.) 



Curimatus microcephalus Eigenmann and Eigenmann, Ann. N. Y. Acad. Sci., IV, 



1889, 15 (Surinam); Proc. U. S. Nat. Mus., XIV, 1891, 47.— Eigenmann, 



Repts. Princeton Univ. Exp. Patagonia, III, 1910, 421. 



Three specimens, 75-124 mm. Tukeit. (C. M. Cat. No. 2106a-o; I. U. Cat. 

 No. 12291.) 



Eight specimens, 60-110 mm. Creek below Potaro Landing. (C. M. 

 Cat. No. 2107a-d; I. U. Cat. No. 12292.) 



Two specimens, 40-92 mm. Konawaruk. (C. M. Cat. No. 2107a-o.) 



Eight specimens, the largest 55 mm. Amatuk. (C. M. Cat. No. 2108a-d; 

 I. U. Cat, No. 12293.) 



Eleven specimens, the largest 105 mm. Kangaruma. (C. M. Cat. No. 

 2109a-/; I. U. Cat. No. 12294.) 



Two specimens, 62 mm. Mora Passage. (C. M. Cat. No. 2110a; I. U. 

 Cat. No. 12275.) 



Seven specimens, the largest 71 mm. Crab Falls. (C. M. Cat. No. 2118a-d; 

 I. U. Cat. No. 12296.) 



Two specimens, 46-56 mm. Wismar. (C. M. Cat. No. 2111a; I. U. Cat. 

 No. 12297.) 



Twenty-nine specimens, the largest 90 mm. Erukin. (C. M. Cat, No. 

 2112a-e; I. U. Cat. No. 12298.) 



Sixty-one specimens, the largest 100 mm. Rockstone. (C. M. Cat, No. 

 2113a-f; I. U. Cat. No. 12299.) 



Two hundred and fourteen specimens, the largest 125 mm. Tumatumari. 

 (C. M. Cat. No. 2114a-2 and 2115; I. U. Cat. No. 12300.) 



Head 4; depth 3; D. 11 or 12; A. 9 or 10; scales 5-33 or 34-5; eye 1 + in snout, 

 3 in head, 1+ in interorbital. 



Elongate; ventral area rounded, with a median series of scales; predorsal 



