512 PROCEEDINGS OF THE ACADEMY OF [July 



of moderate depth. Gill membranes free from each other and from the 

 isthmus. 



Dorsal moderately high, its base If in its height. Adipose long with 

 a small base. 



Caudal widely emarginate, its lobes leathery, generally worn off 

 round. Pectorals small, reaching f distance to insertion of ventrals. 

 ^'entrals large, inserted under the latter half of the dorsal, reaching f 

 distance to the vent. Anal small, its posterior border emarginate. 

 When closed the tip of the third ray reaching tip of last ray. 



Scales above lateral line smaller than those below. 



Color bluish-gray | distance down to lateral line, below this silvery- 

 white. A conspicuous oval ]:)lack spot just above lateral line back of 

 the dorsal. The tip of the caudal lobes dusky, each caudal lobe with 

 a dusky band running nearly parallel with its outer margin and about 

 three rays removed from the margin. The other fins immaculate. 



Scales 19 or 20-84 to 92-10 or 11 ; depth .3f ; head 4^; D. 11 ; A. 11 ; 

 P. IS; V. 11; eye 3Un head. 



This species stands nearest to H. microlcpis, from which it differs in 

 the larger scales. 



49. Paradon tortuosus Eigenmaun and Xorris. 



One specimen (1S7), Arro3^o Trementina. 



50. Paradon affinis Steindachner. Piki. 



Forty specimens of this species, from the Rio Paraguay at Asuncion 

 (90 and 5), agree with Steindachner's description in all but the dentition 

 of the lower jaw. There are no teeth on the sides. 



51. Anostomus fasciatus (Agassiz). Boga. 



Two specimens, Rio Paraguay at Asuncion (SO) and Estancia La 

 Armonia (2S). 



52. Leporinus hypselonotus Gfmther. Per-do-folha. 



One specimen (110), Asuncion or Matto Grosso? 



53. Leporinus conirostris Steindachner. Boga. 

 One specimen (S2), Asuncion, Paragua3^ 



54. Leporinus trifasciatus Steindachner. Boga. 



One specimen (39), Rio Paraguay at Asuncion. 



55. Odontostilbe paraguayensis sp. uov. 



Type Xo. 9,9SS, a single specimen, 40 mm. (95). Asuncion. 

 Co-types No. 10,111, three specimens, 40 mm. (251 in part). 

 Arroyo Trementina. 



Depth 2f; head 3f; D. 11; A. 21; scales 6-32 or 33-4. 



