220 MEMOIRS OP THE CARNEGIE MUSEUM 



89. Corydoras punctatus (Bloch). (Plate XXIV, fig. 3.) 

 Cataphradus 'punctatus Block, Ausl. Fische, VIII, 1794, ])!. 377, fig. 2. — Block 



and Schneider, Sj'st. Ichth., 1801, 108. — Lacepede, Hist. Nat. Poiss., V, 1803, 



125 (Surinam). 

 Hoplisoma punctata Swainson, Class. Fishes, Amph., and Rept., II, 1839, 304 



(name onl_y). 

 Callichthys punctatus Gunther, Catalogue, V, 1864, 229 (Essequibo). 

 Corydoras punctatus Eigenmann and Eigenmann, Proc. Cal. Acad. Sci., (2), I, 



1888, 166 (Jose Fernandez).—? Perugia, Ann. Mus. Geneva, (2), X, 1891, 



635 (Rio de la Plata). — Eigenmann, Repts. Princeton Univ. Exp. Patagonia, 



III, 1910, 403. 

 Corydoras geoffroyi Lacepede, Hist. Nat. Poiss., V, 1803, 147 (locality ?). 

 Corydoras ambiacus Cope, Proc. Acad. Nat. Sci. Phila., 1871, 280 (Ambyiacu River, 



Ecuador) . 

 Gasterodennus ambiacus Cope, Proc. Am. Philos. Soc, XVII, 1878, 681 (Nauta). 



Four specimens, 43-58 mm. Mud-flats of Demerara River. (C. M. Cat. No. 

 1560a-6; I. U. Cat. No. 11977.) 



Three specimens, 48-52 mm. Erukin. (C. M. Cat. No. 1561o; I. U. Cat. 

 No. 11978.) 



Sixteen specimens, 28-40 mm. Malali. (C. M. Cat. No. 1562a-e; I. U. Cat. 

 No. 11979.) 



One specimen, 45 mm. Below Packeoo Falls. (C. M. Cat. No. 1563o). 



Two specimens, 29-36 mm. Tumatumari. (C. M. Cat. No. 1564a; I. U. 

 Cat. No. 11980.) 



Twenty-nine specimens, 39-54 mm. Creek below Potaro Landing. (C. M. 

 Cat. No. 1565a-e; I. U. Cat. No. 11984.) 



Two specimens, 50 mm. Kumaka. (C. M. Cat. No. 1566a; I. U. Cat. No. 

 11981.) 



One specimen, 29 mm. Wismar. (C. M. Cat. No. 1567a.) 



Sixteen specimens, 29-45 mm. Konawaruk. (C. M. Cat. No. 1568a-e; I. U. 

 Cat. No. 11982.) 



Sixteen specimens, 28-38 mm. Rockstone sand-bank. (C. M. Cat. No. 



1569a-e; I. U. Cat. No. 11983.) 



24 23 

 Head 3.25-3.33; depth 2.6-3; D. 1,7-8; A. 1,6 or 1,7; plates ~^ or ty,- 



Profile strongly curved; eye 3.5-4 in the head; maxillary barbels reaching 

 lower angle of gill-opening or shorter. Origin of dorsal equidistant from tip of 

 snout and tip of spine of adipose or upper caudal fulcra; dorsal spine smooth in 



