300 MR. C. TATE REGAN ON THE 



5. Oxyloricaria eobusta, sp. n. (Plate XIX. fig. 1.) 



Length of head 4f times in the total length. Breadth of head If times in its 

 length, diameter of eye 9|- times, interorbital width nearly 4 times, length of snout 

 If times. Upper surface of head and snout as in 0. guentheri. 33 scutes in a 

 longitudinal series, 18 + 15. Upper lateral keel obsolete anteriorly; keels separate on 

 the anterior scutes of the single lateral 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 4-j 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 L. 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, 

 20-21-1-16, the anal plate bordered anteriorly by 3 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 4|-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 L. rostrata, in his account of the Bach Collection. 



7. f Oxyloricaria rostkata. 



Loricaria rostrata Spix, Gen. et Spec. Pise. Bras. p. 5, pi. iii. (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 4J 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 1^ 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 0. guentheri. 



The specimen described by Kner is about 240 mm. in total length. 



Rio Bianco. 



