27. CREAGRUTTTS. 339 



1. Bryconops alburnus. 



Bryconops alburnoides (!), Kner, I. c. 

 alburnus, Kner, taf. 9. fig. 22. 



D. 11. A. 32-33. V. 9. L. lat. 55-60. L. transv. 9/4. 



The height of the body is somewhat more than the length of the 

 head, and two-ninths of the total (without caudal). Sides with a 

 bright, shining silvery longitudinal band ; middle and margin of the 

 caudal fin black. (Kner.) 



Rio Guapore. 



2. Bryconops lucidus. 

 Kner, I. c. p. 181. fig. 23. 



D. 10. A. 38. V. 9. L. lat. G2. L. transv. 9/4. 



The height of the body is one-fourth of the total length (without 

 caudal), the length of the head one-fifth. Sides with a silvery lon- 

 gitudinal band. Only the upper caudal lobe has a dark margin. 

 (Kner.) 



Rio Branco. 



27. CREAGRITTUS. 



Dorsal fin placed in the middle of the length of the body, imme- 

 diately behind the ventrals ; anal of moderate length. Body oblong, 

 compressed, covered with scales of moderate size. Lateral line dis- 

 tinct. Belly rounded. Cleft of the mouth of moderate width ; teeth 

 more or less compressed and notched, in three series in the upper 

 jaw, and in a single in the lower ; maxillary with a few blunt teeth ; 

 palate toothless. Nostrils close together. Gill-openings wide, the 

 gill-membranes not being attached to the isthmus ; gill-rakers short, 

 lanceolate. 



1. Creagmtus malleri. 



Leporinus miilleri, Giinth. Proc. Zool. Soc. 1859, p. 92. 



B. 4. D. 11. A. 14. V. 8. L. lat. 39. L. transv, 5/3. Vert.J?. 



This fish has externally the appearance of a Leucispus. The height 

 of its body is contained thrice and one-third in the total length, the 

 caudal fin not included; the length of the head four times. The 

 snout is rather short and obtusely convex, not longer than the dia- 

 meter of the eye, which is one-fourth of the length of the head. 

 Interorbital space entirely osseous, rather convex, its width being 

 more than the diameter of the eye ; the lower infraorbital is much 

 dilated, as wide as the eye, and touches the lower praeopercular limb, 

 but not the angle. The front series of intermaxillary teeth is com- 

 posed of three pairs of small subcorneal teeth, the second series of 

 two pairs, and the hinder series of four pairs ; the latter are the 

 largest, and provided with two or three points. Mandible with three 

 pairs of strong front teeth, and with some small ones on the sides. 



7.2 



