eigenmann: the FRESHWATER FISHES OF BRITISH GUIANA 175 



Two specimens, 89-93 mm. (maxillary barbel 110-115). Crab Falls. (C. M. 

 Cat. No. 1613; I. U. Cat. No. 12014.) 



Two specimens, 111 mm. to base of lower caudal lobe. Rupununi. (C. M. 

 Cat, No. 1614; I. U. Cat. No. 10215.) 



Vomerine teeth present; upper caudal lobe 2.66 in the length; eye greater 

 than interorbital to 1.5 in interorbital; color in young ashy to below the lateral 

 line, lateral line and a narrower line half-way between it and the back light, the 

 dark streak below the lateral line breaking into spots at times, the light line on the 

 upper part of the sides becoming irregular; a dark predorsal spot; a darker streak 

 along humeral spine to above the ventral; dorsals spotted; color especially bright 

 in Nos. 1614 C. M. Cat. and 12015 I. U. Cat.; color of adult uniform ashy, without 

 spots. 



A single small specimen, 50 mm. long, from Tumatumari, probably belongs 

 here. 



Two specimens, 275 (maxillary barbel 171, not reaching to caudal)-330 mm. 

 (maxillary barbel 235, reaching to caudal). Botanic Gardens. (C. M. Cat. No. 

 1615; I. U. Cat. No. 12016.) 



Five specimens, 190-172 mm. Lama Stop-Off. (C. M. Cat. No. 1616; I. U. 

 Cat. No. 12017.) 



Steel-blue, with light reticulations breaking the blue into small spots; lateral 

 line white. 



Maxillary barbel usually not reaching the caudal. Eye 1.5 in interorbital. 



48. Pimelodus ornatus Kner. 



Pimelodus ornatus Kner, SB. Akad. Wiss. Wien, XXVI, 1857, 411, fig. 18 

 (Surinam; Rio Negro; Cujaba). — Gunther, Catalogue, V, 1864, 116 (River 

 Capin, Para).— Peters, MB. Akad. Wiss. Berlin, 1877, 470 (Calabozo).- 

 Eigenmann and Eigenmann, Proc. Cal. Acad. Sci., (2), 1, 1888, 134 (Goyaz). — 

 Eigenmann and Kennedy, Proc. Acad. Nat. Sci. Phila., 1903, 499 (Asuncion; 

 Arroyo Trementina). — Eigenmann, Ann. Carnegie Mus., IV, 1907, 115 

 (CorumM); Repts. Princeton Univ. Exp. Patagonia, III, 1910, 388. 



Pseudorhamdia ornata Bleeker, " Silures de Suriname," 1864, 77 (Surinam). 



Silurus megacephalus (ex Natterer, MS.) Kner, SB. Akad. Wiss. Wien, XXVI, 1857, 

 413. 

 Five specimens, 140-283 mm. Creek below Potaro Landing. (C. M. Cat. No. 



1618a and b; I. U. Cat. No. 12018.) 



Twenty-six specimens, 45-167 mm. Tumatumari. (C. M. Cat. No. 1619a- 



e; I. U. Cat. No. 12019.) 



