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Show •] DR. A. GUNTHER ON THE FISHES OF PANAMA. 603 NEETROPLUS, g. n. Differing from Heros in having a front series of flat incisor-like teeth. NEETROPLUS NEMATOPUS. n i? A 8 Lf. l0. A. j. From Lake Managua. • PlMELODUS MANAGUENSIS. D. 1/6. A. 14-15. P. 1/9. Adipose fin rather more than one-third of the total length (without caudal) ; maxillary barbels extending nearly to the base of the dorsal fin. Dorsal spine very feeble ; anal rays not nearly extending to the end of the adipose fin, if laid backwards. Lake Managua. CH^ETOSTOMUS ASPIDOLEPIS. L. lat. 25. Diameter of the orbit one-third of the width of the interorbital space. Interoperculum with very few short spines. Seven scutes between the two dorsal fins, twelve between anal and caudal. Veragua. PRISTIGASTER MACROPS. D. 13. A. 61. L. lat. 53. Greatest depth of the body one-third of the total length (without caudal). Eye one-third of the length of the head. Origin of dorsal midway between caudal and scapula. Panama. PRISTIGASTER ARGENTEUS. D. 11. A. 56. L. lat. 51. Greatest depth of the body two-sevenths of the total length. Eye two-sevenths of the length of the head. Origin of dorsal much nearer to caudal than to scapula. Panama. MELETTA PETENENSIS. D. 14-15. A. 20-23. L. lat. 40. Distinguished from M. thrissa by its larger head, the length of which is two-sevenths of the total (without caudal). Lake Peten. MELETTA LIBERTATIS. D. 17. A. 19. L. lat. 48. ' The length of-the head is contained thrice and two-thirds in the |
