500 MR, C. TATE REGAN ON THE 
5. OXYLORICARIA ROBUSTA, sp. n. (Plate XIX. fig. 1.) 
Length of head 43 times in the total length. Breadth of head 1% times in its 
length, diameter of eye 9} times, interorbital width nearly 4 times, length of snout 
12 times. Upper surface of head and snout as in 0. guentheri. 33 scutes in a 
longitudinal series, 18415. Upper lateral keel obsolete anteriorly ; keels separate on 
the anterior scutes of the single Jateral series of the tail, united posteriorly. Lower 
surface of head and abdomen and fins as in 0. guentheri. Breadth of body at level of 
last anal ray 44 times in the distance from the latter to the caudal. Olivaceous; fins 
with dark spots on the rays. 
Total length 250 mm. 
Two specimens from the Rio Paraguay, collected by Dr. 'Ternetz, had been referred 
by Boulenger to Z. rostrata in his account of the Ternetz Collection. 
6. OXYLORICARIA LYRA, sp. n. (Plate XIX. fig. 2.) 
Closely allied to the preceding species, but with a smaller eye (diameter 9-11 times 
in the length of head), more numerous scutes, 36-37 in a longitudinal series, 
20-21-+-16, the anal plate bordered anteriorly by 5 which are again bordered by 
3 or 4, instead of by 5, and the body more slender, the width at the level of the last 
anal ray 48—5 times in the distance from the latter to the caudal. Olivaceous, dorsal 
and pectoral with dark spots on the rays; anal sometimes with a blackish tip; lower 
lobe of caudal with an oblong blackish patch. 
Total length 250 mm. 
Ten specimens from the Rio Jurua, collected by Dr. Bach, had been referred by 
Boulenger to Z. rostrata, in his account of the Bach Collection. 
7. FOXYLORICARIA ROSTRATA. 
Loricaria rostrata Spix, Gen. et Spec. Pisce. Bras. p. 5, pl. ii. (1829); Cuv. & Val. Hist. Nat. 
Poiss. xv. p. 478 (1840) ; Kner, Denkschr.. Ak. Wien, vi. 1853, p. 83; Giinth. Cat. Fish. v. 
p- 256 (1864). 
Length of head about 41 times in the total length. Breadth of head nearly twice 
in its length. Diameter of eye about 8 times in the length of head, length of snout 
about 14 times. Single lateral series of scutes of the tail composed of the last 
10-13 scutes; lateral keels obsolete anteriorly, completely united posteriorly. Pectoral 
spine not extending beyond base of ventral. Caudal with some dark spots. In other 
characters similar to O. guentheri. 
The specimen described by Kner is about 240 mm, in total length. 
Rio Branco. 
