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Show 1895.] EROM MATTO GROSSO AND PARAGUAY. 525 Brown above, whitish beneath; fins uniform or with small blackish spots. Total length 80 millim. Several specimens from Descalvados, Matto Grosso. This species is named after Prof. C. Eigenmann, the author of the excellent Synopsis of South American Siluroid Irishes. It connects the sections Oxydoras and Rhinodoras as defined by that author, agreeing with the former in the serrature of the dorsal spine, with the latter in all other respects. 5. CALLICHTHYS PECTORALIS, sp. n. Depth of body 3^- to 3g times in total length. Head depressed, broader than deep, 3 | times in total length, without bristles on the sides ; diameter of eye 6 times in length of head, 4 times in interorbital width; suborbital bone narrow ; occipital bone pointed in front, not reaching frontal fontanelle; inner barbels half total length. Pectoral spine § length of head, covered with fine bristles, serrated on the inner side. Dorsal I 7 ; spine nearly \ length of head. Anal 15. A pair of large pectoral plates, in contact anteriorly, or narrowly separated, their inner borders diverging behind. Shields on body reaching to base of dorsal fins, 23 above and 22 below lateral line ; 3 or 4 pairs and 5 to 7 azygos shields between the two dorsal fins. Caudal rounded. Dark brown, with small blackish spots. Total length 85 millim. Several specimens from Monte Sociedad, Paraguayan Cbaco. This species is nearest allied to C. thoracatus, C. & V., and C. longifilis, C. & V., but differs in the larger pectoral plates, the wide separation between the frontal fontanelle and the occipital bone, and in the smaller number of anal rays. 6. PLECOSTOMUS TERNETZI, sp. n. Head as long as broad, 3 times in total length; three very obtuse keels ; snout rounded, entirely granulated ; diameter of eye 7 times in length of head, 4 times in length of snout, 2 | times in interorbital wddth ; barbel as long as diameter of eye ; 44 teeth on each side in the upper jaw, and about as many in the lower jaw; interopercle with very small spines. Sides of throat, thorax, and middle of belly covered with small shields. Dorsal I 7 ; first ray as long as head, reaching adipose fin. Pectoral spine as long as head, strong, with small curved spines. Ventrals I 5, first ray a little shorter than head. Anal I 4. Lower caudal rays very long, as long as head, twice as long as upper. Depth of caudal peduncle 2j in distance between anal and caudal fins. Post-humeral keel very obtuse and short, not extending beyond base of ventral. Scutes on body rough and spinulose but not keeled; lat. 1. 25; 14 scutes between the anal and caudal fins. Uniform olive above, white beneath. Total length 240 millim. |