284 ME. C. TATE BEGAN 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 f-f 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 3-Jr— 3^- 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 daidc 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 L. 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 

 L. paulina a female. 



18. LORICARIA LJ5VIUSCULA. 



Loricaria Imviuscula Cuv. & Yah Hist. Nat. Poiss. xv. p. 476 (1840) ; Kner, Denksclir. Ak. Wien, 

 vi. 1854, p. 81, pi. iii. ; Giinth. Cat. Fish. v. p. 256 (1864) ; Eigeum. & Eigenm. Proc. Cal. 

 Ac. (2) ii. 1889, p. 37, and Occ. Pap. Cal. Ac. i. 1890, p. 380 (part.). 



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

 length, diameter of eye 6-6f times, interorbital width 9 times, length of snout If 

 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 papillae, 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 jaw r s with 10-12 rather small 



