284 MR. C. TATE REGAN ON THE 
breadth, rounded ; free portion of barbel not greater than diameter of eye; teeth well 
developed, 6-8 on each side in both upper and lower jaws. 29-30 scutes in a longi- 
tudinal series, 17-18-++-11-12, all in front of the dorsal very weakly carinate, the lateral 
keels weak, obtuse, and united posteriorly; a third very indistinct keel on the anterior 
9-11 scutes above the upper lateral keel, which form a distinct series free from the 
series below them. Lower surface of head and anterior portion of abdomen naked; 
abdomen with a series of plates on each side, and with a group of moderately large 
plates posteriorly, extending forward to about halfway between pectorals and ventrals ; 
anal plate bordered by 3 or 4. First dorsal ray 3-4 the length of head; pectoral spine 
extending to base of ventral; ventrals rounded, the spine not produced, the second and 
third soft rays the longest; caudal emarginate, the outer rays not produced. Breadth 
of body at base of first anal ray 33-34 times in the distance from that point to 
the caudal. Back with four dark cross-bands, the first through the base of the 
dorsal fin ; all the fins with dark spots; dorsal and caudal with a more or less distinct 
dark intramarginal band and narrow light edge. 
Total length 270 mm. 
Four specimens: River Mogy-guassu, about 250 miles inland of Santos. 
This species is remarkable for the difference between the two sexes. The males have 
a broader and more rounded snout and a long broad patch of bristles on each side of 
the head; in addition, the whole upper surface of the body and of the pectoral fins is 
roughly covered with short spines, so that the keels on the anterior scutes are still less 
evident than in the smooth-bodied female. In the original description Boulenger stated 
that LZ. paulina might be the female of L. latirostris, “ although the differences are 
greater than are known to be merely secondary sexual in other members of the genus.” 
However, I have no hesitation in uniting them, especially after dissection of one 
specimen of each, with the expected result—that of L. latirostris being a male, of 
LL. paulina a female. 
18. LorIcariA LEVIUSCULA. 
Loricaria leviuscula Cuy. & Val. Hist. Nat. Poiss. xv. p. 476 (1840) ; Kner, Denkschr. Ak. Wien, 
vi. 1854, p. 81, pl. ili.; Giinth. Cat. Fish. v. p. 256 (1864) ; Eigenm. & Eigenm. Proc. Cal. 
Ac. (2) 11. 1889, p. 37, and Occ. Pap. Cal. Ac. i. 1890, p. 380 (part.). 
Length of head 41-43 times in the total length. Breadth of head 12 times in its 
length, diameter of eye 6-63 times, interorbital width 9 times, length of snout 14 
times. Snout pointed; upper surface of head without keels, evenly convex; supra- 
orbital edges very slightly raised; orbit with a broad shallow notch; lips with very 
small papille, the upper narrow, with moderately long tentacular fringes; the lower 
lip broad, its posterior border smooth, entire or slightly crenulate, emarginate; free 
portion of barbel less than the diameter of eye; both jaws with 10-12 rather small 
