The freshwater fishes of British Guiana, including a study of the ecological grouping of species and the relation of the fauna of the plateau to that of the lowlands . downward behind gill-opening; a more or less evidentdark streak across the nuchal plate; a conspicuous dark band across the back anddorsal fin, extending forward below to the axil; one or two more or less evidentdark blotches on the back of the tail, the anterior over the anal; fins colored likethe adjoining portions of the body. Agmus4 gen. Eigenmann, Repts. Princeton Univ. Exp. Patagonia, III, 1910, 379. Type, Agmus
The freshwater fishes of British Guiana, including a study of the ecological grouping of species and the relation of the fauna of the plateau to that of the lowlands . downward behind gill-opening; a more or less evidentdark streak across the nuchal plate; a conspicuous dark band across the back anddorsal fin, extending forward below to the axil; one or two more or less evidentdark blotches on the back of the tail, the anterior over the anal; fins colored likethe adjoining portions of the body. Agmus4 gen. Eigenmann, Repts. Princeton Univ. Exp. Patagonia, III, 1910, 379. Type, Agmus scabriceps Eigenmann and Eigenmann (Plate IV). This genus differs from Bunocephalus in the great development of tuberclesabout the head, which at the occiput is almost as high as it is wide: the depth of thehead at this point equals the distance of the pectoral from the snout. This genusreaches the limit of divergence from Aspredo. 11. Agmus lyriformis sp. nov. (Plate III.)Agmus lyriformis Eigenmann, Repts. Princeton Univ. Exp. Patagonia, III, 1910, 379 (name only). Type, 56 mm. Gluck Island. (Carnegie Museum Catalog of Fishes ) Cotype, 49 mm. Fig. 25. Agmus lyriformis C. M. Cat. No. 1554. (I. U. Cat. No. 11972.) The only other species of the genus isA. scabriceps Eigenmann and Eigenmannfrom Jutahy, differing from lyriformis in itsconverging coracoid processes, mottled fins,and extremely tubercular head. Head to end of occipital process its length; depth of head at occipital pro-cess about equal to its width at gill-open-ings. D. 5; A. 6. Nuchal plate with two high knobs;dorsal plate with two small knobs, one oneither side in front of the dorsal; a trans-verse ridge in front of the nuchal crest,curved backward on the sides and endingin a small knob; a knob over each eye, con-tinued backward as a low crest with a small knob near its middle and a larger one in front of the large occipital knob, the two 4 ayiibs, a craggy place. EIGENMANN:
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Keywords: ., bookauthoreigenman, bookcentury1900, bookdecade1910, bookyear1912
