32 MR. G-. A. BOULENGEE ON FISHES 



42. Otocinclus affinis, Stdr. 

 Descalvados, Matto Grosso. 



43. LORICARIA ROSTRATA, Spix. 



Paraguay. 



44. Loricaria parva. (Plate VIII. fig. 1.) 

 Loricaria parva, Boulengcr, P. Z. S. 1895, p. 527. 



Teeth small, well developed in both jaws. Head 1| as long as broad, 4§ to 5 times 

 in total length; snout obtusely pointed, feebly projecting beyond the lip; head-shields 

 with longitudinal, spinulose strise, without keels ; diameter of orbit 5^ to 6 times in 

 length of head, 2-| to 2§ times in length of snout, IJ to If in interorbital width ; a 

 broad postorbital notch ; lower labial fold moderately large, papillose, feebly notched, 

 with a fringe of obtuse papilla?. Dorsal I 7 ; first ray 1J to 1^ as long as head, just 

 above base of ventral. Pectoral I 6, as long as head or a little shorter, reaching 

 beyond base of ventral. Ventral I 5, as long as pectoral, reaching beyond origin of 

 ventral. Anal 1 5. Outer caudal rays much produced, filiform, upper longest. 

 Lateral scutes 26-28, with two spinose ridges approximating on the loth or 14th; nuchal 

 shields without keels ; 16 or 17 scutes between dorsal and caudal, 14 or 15 between 

 anal and caudal. Breast and belly shielded ; pectoral shields numerous, polygonal, 

 irregular; ventrals 7 to 9 transversely enlarged ones on each side and 3 series of small 

 ones in the middle. All the shields spinulose and striated. Olive above, with ill- 

 defined dark cross-bars ; a dark streak on each side of the snout, from the tip to the 

 eye ; fins with dark spots. 



Total length 110 millim. 



Numerous specimens from Descalvados, Matto Grosso. 



This species is nearest related to L. Jilamentosa, Stdr. 



45. Loricaria labialis. (Plate VII. fig. 1.) 



Loricaria labialis, Boulenger, P. Z. S. 1895, p. 527. 



Teeth minute, rudimentary, in both jaws. Head If as long as broad, 4J to 4| times 

 in total length ; snout obtusely pointed, feebly projecting beyond the lip ; head-shields 

 rough with villose spinules, except on the edge of the end of the snout, without keels; 

 diameter of orbit 6 to 6-^ times in length of head, 3 times in length of snout, 1^ in 

 interorbital width ; a broad postorbital notch ; lower labial fold moderately large in 

 females, very large and extending to the pectoral shields in males, without notch and 

 without fringe. Dorsal I 7 ; first ray nearly as long as head, just above base of ventral. 

 Pectoral I 6, as long as head to posterior border of orbit, not reaching base of ventral. 

 Ventral I 5, as long as pectoral, reaching origin of anal. Anal I 5. Upper caudal ray 



