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Show 160 MR. C. TATE REGAN ON SOUTH-AMERICAN [Mar. 7, Diameter of eye 3|-5j in the length of head, length of snout 3 -3 f, interorbital width 3-4. Nostril nearer to eye than to tip of snout. Maxillary extending to below anterior -J- of eye ; depth of prseorbital \ the diameter of eye. Anterior teeth forming 4 or 5 series in the upper jaw, 3 or 4 in the lower. 9-11 gill-rakers on the lower part of anterior arch. Scales denticulated except on the head and the lower parts of thorax and abdomen, 60-73 jjEyij, 50-62 in a longitudinal series below the lateral line, 3-41 between last dorsal spine and lateral line, 2 or 3 between upper and lower lateral lines. Lateral line 22-26 + 9-12. Dorsal X V I I -X X 13-16, the spines subequal from about the eighth, the last -g-| the length of head. Anal III 8-10. Pectoral about •§, ventral | the length of head. Caudal peduncle | to as long as deep. Olivaceous; a dark stripe from eye to extremity of operculum, sometimes continued forward on the snout, rarely edged with white above and below ; often a dark spot or oblique stripe below the eye ; body with or without white spots, which may be numerous and well-developed ; sometimes a continuous dark longitudinal band from operculum to caudal, which may be represented by a series of blotches or by a single blotch, or sometimes an ocellated spot, above the pectoral; a dark spot, often ocellated, on the upper part of the base of caudal; dorsal and anal sometimes with a narrow dark edge ; spinous dorsal sometimes with an intramarginal series of blackish spots, one on each interradial membrane ; soft dorsal and caudal often with alternate series of light and dark spots. R. Amazon ; Guiana ; Trinidad ; Rio Grande do Sul. Sir R. Scliomburgk. Dr. Hancock. Mr. Ehrhardt. College of Surgeons. Stuttgart Mus. Mr. Kappler. C. W . Cottam, Esq. J. G. Beckford, Esq. Mus. Comp. Zool. Dr. H. von Iliering. F. W . Urich, Esq. L. Guppy, Esq. 1 . (133 mm.) Brit. Guiana. 2-4 . (99-145 mm.) Demerara. 5, 6. (89 and 103 mm.) Brit. Guiana. 7. (200 mm.) 8 ,9 . (171 and 226 mm.) Guiana. 10,11. (73 and 108 mm.) R. Cupai. 12. (217 mm.) R. Essequibo. 13-15. (170-271 mm.) 16-18. (150-201 mm.) 19. (141 mm.) Surinam. 20-22. (165-211 mm.) < 55 23. (66 mm.) Brit. Guiana. 24, 25. (154 and 205 mm.) Berbice. 26. (104 mm.) Tabatinga. 27. (155 mm.) Rio Grande do Sul. 28. (185 mm.) Trinidad. 29-35. (153-251 mm.) „ 3. C r e n ic ic h l a lu c iu s . Crenicichla lucius Cope, Proc. Am. Phil. Soc. xi. 1871, p. 570 ; Pellegr. Mem. Soc. Zool. France, xvi. 1903, p. 377 (1904). Crenicichla antliurus Cope, Proc. Ac. Philad. xxiii. 1872, p. 252, pi. x. fig. 1 ; Pellegr. 1. c. Depth of body 4f-5| in the length, length of head 3. Diameter of eye 4|-6 in the length of head, length of snout 3|-3f, interorbital width 4-5,}. Nostril nearer to eye than to tip of snout. Maxillary extending to below anterior 1 of eye ; depth of |