626 Notes on some South American Fishes. 



type has so far been indicated. I here wish to restrict the name 

 to Sternopygus macrurus Bloch (= Gymnotus carapo L.), the first 

 species described by Miiller and Troschel. This genus is to include 

 those species of the genus as hitherto understood, which have a free 

 orbital rim. They are: — 



1 Sternopygus carapo (L.). One specimen from Marajo, another 



without habitat. 



2 Sternopygus aequilaliiatus Humboldt. 



3 Sternopygus Obtusirostris Steindachner. 



For those species without free orbital rim I propose the name: — 



CRYPTOPS gen. nov. 

 Type : Sternopygus humholdtii Steindachner. 



The species of this genus are : — 



1 Cryptops humlioldtii Steind. Three specimens. Two of them from 



Marajo. 



2 Cryptops virescens (Val.). 



3 Cryptops axillaris (Giinther). 



4 Cryptops troschelii (Kaup). 



Carapus fasciatus (Pallas). One specimen. Braret. 

 Cetengraulis edentulus (Cuv.). 



Oblong, not greatly compressed, the snout sharply pointed and projecting 

 much beyond the narrow lower jaw. Maxillary not reaching to the angle of 

 the lower jaw. Upper jaw with minute but distinct teeth. Eye twice as 

 long as snout, little more than interorbital, 4 in head. Gill-rakers slender 

 and very numerous, longer than eye. Scales largely persistent. Dorsal and 

 anal with complete sheaths. Origin of dorsal equidistant from base of middle 

 caudal rays and from anterior margin of eye. Anal inserted under end of 

 dorsal. Ventrals about as long as eye, just anterior to dorsal in position. 

 Pectorals small, not covering the bluntly trenchant breast, scarcely reaching 

 ventrals. Silvery, darker above. Head 3| ; depth 3 ; D. II, 14 ; A. II, 23 ; 

 scales about 40. 



One specimen, 125 mm. to base of caudal. Rio Janeiro. 



Lycengraulis grossidens (Cuv.). 



Head 4i (4^); depth 4| (4); D. I, 14| (I, 11^); A. II, 28| (II, 2^). 

 Scales 40. Compressed. Maxillary reaching to angle of lower jaw, its teeth 

 in a single series and nearly equal. Lower jaw with about 17 much larger 

 teeth on each side, between them are found a few smaller teeth (with about 



