FISHES OF THE FAMILY LORICARIIDA, 275 
fringes ; lower lip of moderate breadth, emarginate posteriorly ; free portion of barbel 
not longer than diameter of eye; teeth well developed, 8 on each side in the upper 
jaw, 10 in the lower. 31-32 scutes in a longitudinal series, 18-19+ 13-14, all in front 
of the dorsal carinate, the lateral keels strong and separate throughout; a third weaker 
keel on the anterior 10-11 scutes above the upper lateral keel, which forms a distinct 
series free from the series below them. Lower surface of head naked ; abdomen with 
2 or 3 irregular series of plates between the lateral series, the anterior plates smaller, 
extending to the level of the outer angle of the gill-openings, the posterior plates 
somewhat smaller, except a moderately large anal plate or pair of plates, which is 
bordered anteriorly by several. First dorsal ray 1§-1} times the length of head; 
pectoral spine extending a little beyond base of ventral; ventral spine more or less 
produced, the soft portion of the fin rounded, the first and second branched rays the 
longest ; upper ray of caudal very elongate. Breadth of body at level of first anal ray 
4-5 times in the distance from that point to the caudal. All the fins with dark 
spots, the posterior half of each interradial membrane of the dorsal dusky, the caudal 
blackish at the base and at its posterior margin. 
Total length 250 mm. 
Three specimens: R. Magdalena. 
2. LORICARIA NIGRICAUDA, sp. n. (Plate XVI. fig. 2.) 
Length of head 43 times in the total length. Breadth of head 12 times in its length ; 
diameter of eye about 6 times in the length of head, interorbital width 33-4 times, 
length of snout 2§ times. Snout triangular, pointed; supraorbital edges raised ; supra- 
occipital with a pair of serrated keels ; orbit with a moderate notch; lips papillose, 
with short marginal fringes ; free portion of barbel somewhat longer than diameter of 
eye ; teeth well developed, 6 or 7 on each side in both jaws. 29 scutes in a longi- 
inal series, 16-17 -+- 12-13, the lateral keels sharp, separate throughout, all the scutes 
in front of the dorsal carinate. Lower surface of head naked ; abdomen with 3 series 
of plates between the lateral series; anterior plates smaller, extending to the level of 
the middle of the gill-openings; an anal plate, bordered anteriorly by 3, these 3 again 
by 5. First dorsal ray as long as the head; pectoral spine extending slightly beyond 
base of ventral; ventral rays increasing in length from the innermost outwards, the 
spine not produced ; upper caudal ray produced. Breadth of body at level of first anal 
ray 6—64 times in the distance from that point to the caudal. Back with 5 dark cross- 
bands, the first passing through the base of dorsal; head and anterior part of body 
with some small blackish spots; upper third of dorsal, posterior parts of pectoral and 
ventral, and tip of anal blackish; caudal uniformly blackish except the two simple 
outer rays. 
Total length 65 mm. 
Four specimens from Porto Real, Province Rio Janeiro. 
