42 CALIFORNIA ACADEMY OF SCIENCES. 



IX. MiCROLEPIDOGASTER geil. IIOV. 

 Type, M. perforatiis, sp. no v. 



Ventral surface covered with minute granular plates; 

 dorsal fin inserted far posterior to the ventrals; temporal 

 plate perforate. 



47. Microlepidogaster perforatus sp. uov. 



Type, No. 8182; one specimen .032 ni, to base of caudal. 

 Localities: Eio Carandaby, Brazil. 



Broad and depressed anteriorly, the depth less than the 

 width. Head broad, depressed, its depth little more than 

 two in its length to the end of temporal plate; its width IJ 

 in its length. Snout narrow, pointed; loreal region con- 

 cave. Eye 4 in snout, 8.^ in head; interorbital concave, 

 equal to the post-orbital portion of the head. 



All of the plates hispid, most so on the tail, not keeled. 

 Lat. 1. 27. 



X. Neoplecostomus Eigenm & Eigenm. 



This subgenus proposed by us (Proc. Calif. Acad. Sci., 

 2d Ser., Vol. I, p. 171; 1888) may be raised to generic rank. 



Tail comparatively long, terete; adipose fin far removed 

 from the dorsal fin; belly with a median, sub-circular patch 

 of granules. 



A. 6-8. 



48. NeopleCOStomus microps (Steindachuer). 



Localities: Juiz de Fora; Goyaz, 



49. Neoplecostomus granosus (Cuv. &Val.) 



XL Khinelepis Spix. 



50. Rhinelepis parahybae Sieindaclmer. 



Locality: Eio Parabyba, at Barra do Piraby. 



51. Rhinelepis agassizii Steiudachner. 



52. Rhinelepis aspera Spix. 



? R. slrigosa Cuv. & Val. 



53. Rhinelepis lophophanes sp. nov. 



Type. No. 8164; one specimen .018 m. to base of caudal. 

 Localities: Santa Cruz, Brazil. Dom Pedro II. 



