SOUTH AMERICAN NEMATOGNATHI. 277 



Distance of dorsal spine from snout 3-3| in the length; 

 "dorsal spine slender, l§-2 in the head, its inner margin 

 roughened, its anterior margin with a median series of 

 diverging spines and two series of smaller teeth, the first 

 ray higher than the spine. Space between dorsal and 

 adipose fins 2h in the length; anterior margin of the adi- 

 pose fin continuous with the profile of the back. 



Caudal obliquely truncate. 



Anal fin strongly convex behind, higher posteriorly 

 than anteriorly. 



Pectoral spine strongly serrate, the outer teeth much 

 longer than the inner ones, especially near the tip of the 

 spine, the flattened sides strongly granular, the granules 

 enlarged anteriorly, forming serrse along either side of 

 the long spine-like marginal teeth; the length of the 

 «pine 5-6 in the length. 



Lateral line somewhat undulating, with conspicuous 

 pores. 



Dark reddish brown, with longitudinal interrupted 

 bands; belly plain, lower side of head thickly dotted with 

 •darker; dorsal and anal fins spotted; caudal fin with ir- 

 regular dark cross bars; inner surface of ventral and pec- 

 toral fins more or less dusky. 



Head 4-4i ; depth about 3|; D. I, 5; A. 25; V. 6; P. I, 7. 



220. Trachycorystes striatulus. 



Auchenipterus striatulus Steindachner, Siisswasserfische stidostl. 



Bras.iii, 98, pi. v, 1876 (Eio Paraliyba; EioDoce; EioMucury). 

 Trachycorystes striatulus Eigenm. &Eigenm. Proc. Cal. Acad. 2d Ser. 



i, 155, 1888 (Linhares; Eio Doce; Itabapuana; Campos; Sao 



Matheos; Guriipa). 

 Habitat: Mouths of rivers draining eastern Minas Geraes; Eio Para. 



Robust, compressed behind; depth below dorsal spine 

 equal to the width. Head short, about as broad as long, 

 rounded in front, slightly convex in transverse profile 

 in the young, flattish in the adult; surface of the bones 

 granulate, sometimes covered with villous skin in the ? . 



