eigenmann: the FRESHWATER FISHES OF BRITISH GUIANA 249 



Loricaria submarginata Eigenmann, Ann. Carnegie Mus., VI, 1910, 10; Repts. 



Princeton Univ. Exp. Patagonia, III, 1910, 414. 



One specimen, 142 mm. over all, 92 mm. to tip of middle caudal rays. Creek 

 below Potaro Landing. (C. M. Cat. No. 1510.) 



Closely allied to L. brunneus. An examination of the type of L. platyurus in 

 Berlin leaves no doubt about the identity of the species. 



Head very little less than 5 in the length; width of head 1.5 in its length; eye 

 5.5, interorbital 4, snout 2 in the head; width of first anal ray 5 in its distance from 

 the caudal; scutes 12 + 15, the lateral ridges almost completely united on the last 

 seven scutes. 



* Lips well-developed, with a marginal series of fringes, interrupted in the middle 

 in front, and with rather long warts. Lips not nearly reaching gill-opening. Seven 

 or eight teeth in each side of each jaw. Free portion of the barbel about equal to 

 the eye. 



Head without ridges, plates in front of the dorsal but faintly keeled. Orbital 

 not shallow, narrowly rounded. 



Anal plate bordered by three plates in front, the ventral buckler formed of 

 seven to thirteen plates; about three series of plates between the lateral plates, these 

 with the lateral plates forming in the posterior part regular transverse scutes, the 

 scutes becoming more numerous and less regular in front. Armature truncate in 

 front, not extending quite to the anterior angle of the gill-opening. 



Pectorals slightly emarginate, the inner angle rounded, extending to the origin 

 or second fourth of the ventrals; ventral rays graduated, the outer ray scarcely pro- 

 longed, reaching to the base of the last anal ray. 



Pores of the head and to below the dorsal jet-black; obscure cross-bands, that 

 below the base of the dorsal and that below its tip most prominent. No ocellus 

 in front of dorsal. Dorsal spotted, the submarginal spots most prominent. Pec- 

 toral, ventral, and anal each with a broad submarginal dark band; base of caudal 

 and the tips, exclusive of the upper ray, black. Upper caudal ray much prolonged, 

 forming 51 mm. of the total length. 



114. Loricariichthys stewarti (Eigenmann). (Plate XXX, fig. 5.) 

 Loricaria stewarti Eigenmann, Ann. Carnegie Mus., VI, 1910, 9; Repts. Princeton 



Univ. Exp. Patagonia, III, 1910, 414. Allied to L. teffeanus and L. konopickyi. 



Type, 81 mm. over all, 64 mm. to tip of middle caudal ray. Chipoo Creek, a 

 tributary of the Ireng. (Carnegie Museum Catalog of Fishes No. 1508.) 



Cotypes, eleven specimens, 52-68 mm. to tip of middle caudal rays. Chipoo 

 Creek. (C, M. Cat. No. 1509a-c; I. U. Cat. No. 11943.) 



