FISHES OF THE FAMILY LORICARILTLF. 213 



13. Plecostomus latirostris, sp. n. (Plate XI. fig. 1.) 



Plecostomus pantherinus (non Kner) Bouleng. Ann. Mag. Nat. Hist. (6) x. 1892, p. 9. 



Depth of body 4f -5 times in the total length, length of head 3-3| times. Head as 

 broad as long, its depth If— If times in its length, diameter of eye 5^-7 times, inter- 

 orbital width 2§- 3 times, length of snout 1^ times. Length of mandibular ramus 

 lg-l-f times in the interorbital width. Barbel in one specimen (the smallest) almost 

 rudimentary, in the others about equal to -| the diameter of eye. Snout broad, 

 rounded ; supraorbital edges raised ; supraoccipital with median ridge ; temporal 

 plates weakly or obscurely carinate. Scutes spinulose, the upper and anterior weakly 

 or obscurely carinate, 25-27 in a longitudinal series, 6-7 between dorsal and adipose 

 fin, 13-14 between anal and caudal. Supraoccipital entirely bordered posteriorly by 

 a single scute. Lower surface of head and abdomen, in the largest specimen, covered 

 with small granular scales, except for a naked area behind the mouth and one at the 

 base of each ventral ; in the smaller specimens head naked, except for a granular 

 patch in front of each gill-opening, thorax with a transversely granular strip, anterior 

 half of abdomen covered with granular scales, posterior half naked. D. I 7, the first 

 ray as long as the head, not reaching the adipose fin when laid back, the last f- 

 as long ; length of base of dorsal equal to its distance from the posterior part of the 

 spine of the adipose fin. A. I 4. Pectoral spine extending to anterior ^ or anterior 

 £ of ventral. Caudal emarginate. Caudal peduncle 2J-3 times as long as deep. 

 Uniformly olivaceous, the fins blackish, without spots. 



Total length 260 mm. 



Three specimens, from the River Jungada, Matto Grosso, collected by Mr. Spencer 

 Moore, and from Goyaz. After reading Kner's description of Hypostomus pantherinus 

 (founded on a specimen only 3 inches in length), I have reached the conclusion 

 that these specimens cannot belong to that species. 



14. Plecostomus ternetzi. 



Plecostomus ternetzi Bouleng. Proc. Zool. Soc. 1895, p. 525, and Trans. Zool. Soc. xiv. 189G, 

 p. 30, pi. v. 

 Depth of body about A\ times in the total length, length of head 3 times. Head 

 as broad as long, its depth 1^ times in its length, diameter of eye 7 times, interorbital 

 width 3 times, length of snout If times. Length of mandibular ramus If times in 

 the interorbital width. Length of barbel equal to the diameter of eye. Snout broad, 

 rounded ; supraorbital edges raised ; supraoccipital with median ridge ; temporal plates 

 not distinctly carinate. Scutes spinulose, the upper and anterior very obscurely 

 carinate, 26 in a longitudinal series, 7 between dorsal and adipose fin, 14 between 

 anal and caudal. Supraoccipital entirely bordered posteriorly by a single scute. 

 Lower surface of head and abdomen covered with small granular scales except for 



