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Show 244 DR. A. GUNTHER ON NEW AMERICAN FISHKS. [Mar. 26, Three examples, 4\ inches long, were collected by Mr. Bartlett on the Huallaga. HEMIODUS KAPPLERI. Allied to H. notatus, but with the body much more elongate. D. 11. A. 11. V. 11. L. lat. 64. L. transv. 13/8. The scales below the lateral line are much larger than the others ; there are six longitudinal series between the lateral line and ventral fin. The height of the body equals the length of the head, which is two-ninths of the total (without caudal). The depth of the head equals its length, without snout. The distance between the gill-opening and the vertical from the origin of the dorsal is but little less than the length of the head. Origin of the dorsal nearly midway between the end of the snout and the adipose fin, considerably in advance of the root of the ventral. Caudal peduncle longer than deep. Silvery ; a round black spot above the lateral line, behind the dorsal fin, corresponding to the thirty-fourth scale of the lateral line. Each caudal lobe with a black longitudinal band. Two specimens were sent by Hr. Kappler from Surinam. The larger is 9 inches long. LEPORINUS MEGALEPIS, Gthr. Xeberos. Young examples have the upper incisors distinctly notched. , LEPORINUS FREDERICI, Bl. An example found by Mr. Bartlett at Xeberos, and 6 inches long, might be taken for a distinct species of Anostomus, as it has the teeth still distinctly notched. The three spots are confluent into an uninterrupted band-a peculiarity which I have also observed in examples from the Essequibo, though in a less marked degree. LEPORINUS HYPSELONOTUS. (Plate XXII.) D. 10. A. 13. V. 9. L. lat. 37-38. L. transv. 6/7. The height of the body is contained twice and one-half or twice and two-thirds in the total length (without caudal), the length of the head four times and one-half or four times and two-thirds. Back much elevated, with its profile very convex to the dorsal fin. Eve nearer to the end of the snout than to that of the opercle; its diameter is one-fourth of the length of the head, less than that of the snout, and one-half of the width of the interorbital space, which is very convex. Opercle two-thirds as long as deep. Incisors strono-and broad, the form of their edges varying with the age of the tooth. Lips not fringed. Origin of the dorsal fin equidistant between the end of the snout and the adipose fin. Abdomen compressed behind the ventrals. Body with seven more or less broad oblique blackish cross bands ; the two anterior in front of the dorsal; the third from the anterior dorsal rays to behind the ventral |