288 MR. C. TATE REGAN ON: THE 
rays; margin of lower caudal lobe blackish; pectoral blackish, ventrals lighter, 
anal clear. 
Total length 150 mm. 
‘Two specimens: R. Amazon. 
I have examined the type of LZ. castanea, from Rio Janeiro, but have mislaid 
my note on it, and cannot now be certain whether it is distinct from this species 
or not. 
23. fLORICARIA NUDIROSTRIS. 
Loricaria nudirostris Kner, Denkschr. Ak. Wien, vi. 1854, p. 86, pl. iv; Giinth. Cat. Fish. v. 
p- 259 (1864). 
Length of head 44 times in the total length. Breadth of head 1} times in its 
length, diameter of eye about 7} times, interorbital width about 53 times, length of 
snout 15 times. Supraoccipital with a pair of keels, the head otherwise without keels 
or ridges, evenly convex; orbit with a large notch; lips smooth, the lower with entire 
posterior margin ; free portion of barbel a little longer than the eye; upper jaw with 
about 6 minute teeth on each side, lower jaw with 10. About 30 scutes in a longi- 
tudinal series (in the figure 18412), all in front of the dorsal carinate, the lateral 
keels sharp, separate throughout. Lower surface of head naked ; abdominal plates in 
1 series between the posterior plates of the lateral series, 2 between the anterior ones ; 
anal plate bordered anteriorly by 3. First dorsal ray as long as the head; pectoral 
spine not reaching ventral; ventral extending to origin of anal, its first branched ray 
the longest ; caudal emarginate. Breadth of body at level of first anal ray 4} times in 
the distance from that point to the caudal. Dorsal and caudal with dark spots on the 
rays; pectoral blackish, ventral lighter, anal clear. 
‘The type, from the Rio Negro, is 200 mm. in total length. 
24. LORICARIA LABIALIS. 
Loricaria labialis Bouleng. Proc. Zool. Soc. 1895, p. 527, and Trans. Zool. Soc. xiv. 1896, pl. vii. 
neal 
Length of head 44-44 times in the total length. Breadth of head 1} times in its 
length, diameter of eye 7} times, interorbital width 43-5 times, length of snout twice. 
Upper surface of head evenly convex, without keels or ridges; orbit with a large 
notch; lower lip smooth, or with small papilla, its posterior edge entire or with 
scarcely distinct fringes, of moderate size in the female, in the male large, covering the 
entire naked surface of the head; free portion of barbel shorter than diameter of eye; 
upper jaw with 6-8 minute teeth on each side, lower jaw with 10-12. 30 scutes in a 
longitudinal series, 18—21-+- 9-12, those in front of the dorsal not distinctly carinate ; 
the lateral keels sharp, separate throughout. Lower surface of head naked, except for 
