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Show 528 MR. G. A. BOULENGER O N FISHES [June 18, keels; diameter of orbit 6 to 6| times in length of head, 3 times iu length of snout, 1^ in interorbital width ; a broad postorbital notch ; lower labial fold moderately large in females, very large and extendiug 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 produced in a short filament. Lateral shields 30, with two spinose ridges approximating on the 21st or 22nd; nuchal shields without keels; 18 shields between dorsal and caudal, 16 between anal and caudal. Breast and belly shielded; pectoral shields numerous, polygonal, irregular; ventrals 4 to 6 transversely enlarged ones on each side, and one or two series of smaller ones in the middle. All the shields finely granulate and spinulose. Olive above; dorsal and caudal with small dark spots along the rays; pectorals and ventrals blackish. Total length 220 millim. Three specimens from Paraguay. This species is allied to L. nudirostris, Kner, and L. spixii, Stdr. 11. LORICARIA APELTOGASTER, sp. n. A few slender teeth in both jaws. Head slightly longer than broad, 5 times in total length; snout acutely pointed, feebly projecting beyond the lip; head-shields strongly spinulose; occipital shield with two closely approximated, parallel keels ; diameter of orbit 7\ to 8 times in length of head, 4 times in length of snout, IA to 1| in interorbital width ; no postorbital notch ; lower labial fold rather large, with long fringes; barbel long. Dorsal I 7; first ray a little longer than the head, just above base of ventral. Pectoral I 6; first ray more or less produced, at least as long as the head, reaching much beyond base of ventral. Ventral I 5 ; first ray produced, but shorter than pectoral, reaching much beyond origin of anal. Anal I 5. Upper caudal ray produced in a very long filament. Lateral shields 31 or 32, with two spinose ridges uniting on the 17th to 20th ; nuchal shields bicarinate ; 21 or 22 shields between dorsal and caudal, 19 or 20 between anal and caudal. Breast and belly naked, or with small stellate shields ; a series of 6 to 8 small transverse shields m a y be present on each side of the belly. All the shields finely granulate and spinulose. Pale brown above, with three or four darker cross-bars on the body and two on the head ; fins partially blackish. Total length 210 millim. Four specimens from Paraguay. This fish is allied to L. nudiventris, C. & V., L. evansii, Blgr., and especially to L. macrodon, Kner. 12. TETRAGONOPTERUS TERNETZI, sp. n. Depth of body If to li in total length : length of head 3 | to 3f times. Diameter of eye 2-g- to 2g times in length of head, twice |