288 ME. C. TATE REGAN ON THE 



rays ; margin of lower caudal lobe blackish ; pectoral blackish, vcntrals lighter, 

 anal clear. 



Total length 150 mm. 



Two specimens : R. Amazon. 



I have examined the type of L. 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, \i. 1854, p. 86, pi. iv; G'unth. Cat. Fish. v. 

 p. 259 (1864). 

 Length of head 4|- times in the total length. Breadth of head 1^ times in its 

 length, diameter of eye about 7^ times, interorbital width about 5|- times, length of 

 snout If 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 18+12), 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 4f 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 Eio 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, pi. vii. 

 fig. 1. 

 Length of head 4^—4^- times in the total length. Breadth of head H times in its 

 length, diameter of eye 1\ times, interorbital width 4-^—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 papillae, 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 



