FISHES OF THE FAMILY LORICARIIDA. 21 
Ca 
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 43-5 times in the total length, length of head 3-34 times. Head xs 
broad as long, its depth 13-13 times in its length, diameter of eye 54-7 times, inter- 
orbital width 23-3 times, length of snout 13 times. Length of mandibular ramus 
1)-1} times in the interorbital width. Barbel in one specimen (the smallest) almost 
rudimentary, in the others about equal to 4 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 tiie 
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 # 
as long; length of base of dorsal equal to its distance from the posterior part of the 
spine of the adipose fin. A.I4. Pectoral spine extending to anterior } or anterior 
% of ventral. Caudal emarginate. Caudal peduncle 23-3 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. Soe. xiv. 1896, 
p. 30, pl. v. 
Depth of body about 4} times in the total length, length of head 3 times. Head 
as broad as long, its depth 14 times in its length, diameter of eye 7 times, interorbital 
width 3 times, length of snout 1$ times. Length of mandibular ramus 1% 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 coyered with small granular scales except for 
