388 MEMOIRS OF THE CARNEGIE MUSEUM 



243. Mylesinus schomburgki Cuvier and Valenciennes. 

 Mylesinus schomburgkii Cuvier and Valenciennes, Hist. Nat. Poiss., XXII, 1848, 

 235, pi. 644 (based on a head and drawing by Schomburgk). — Kner, "Familie 

 der Characinen," ii, 1859, 24, pi. 3, fig. 7 (Rio Vaupe). — Gunther, Catalogue, 

 V, 1864, 366.— Eigenmann and Eigenmann, Proc. U. S. Nat. Mus., XIV, 

 1891, 59. — Eigenmann, Repts. Princeton Univ. Exp. Patagonia, III, 1910, 442. 

 No specimens were secured by me. 



D. 21-22; A. 32-35; depth 2; head 4; scales 30-100-24; eight to ten ab- 

 dominal seme behind the ventrals; posterior half of the anal produced into a lobe; 

 each of the fifteen or sixteen posterior anal rays terminating in two branches, one 

 being bent towards the right, the other towards the left; base of anal scaled; jaws 

 equal; maxillary about reaching the eye. 



This species, based on a drawing by Schomburgk, may not have been taken 

 within the region covered by this paper. I examined a specimen in the Paris 

 Museum. 



Acnodon Eigenmann. 



Acnodon Eigenmann, Smiths. Misc. Coll., Quarterly Issue, XLV, 1904, 147 (oligo- 

 canthus) . 



Type, Myleus oligocanthus M filler and Troschel. 



No spines in front of the ventrals; belly serrate behind; caudal forked; anal 

 falcate or bilobed, entirely naked. Gill-rakers 11 + 11, those of the upper arch 

 very much shorter than those of the lower, the lower one-fourth the diameter of 

 the eye. Four middle teeth of the inner series of the premaxillary with a V-shaped 

 cutting edge; dorsal rays not filiform. 



244. Acnodon oligocanthus (Mliller and Troschel). 

 Myleus oligocanthus Muller and Troschel, Horse Ichth., I, 1845, 40, pi. 8, fig. 



4 (Surinam). 

 Myletes oligocanthus Gunther, Catalogue, V, 1864, 378 (Demerara). — Eigenmann 



and Eigenmann, Proc. U. S. Nat. Mus., XIV, 1891, 61.— Ulrey, Ann. N. Y. 



Acad. Sci., VIII, 1895, 299 (Brazil). 

 Acnodon oligocanthus Eigenmann, Smiths. Misc. Coll., Quarterly Issue, XLV, 



1904, 147; Repts. Princeton Univ. Exp. Patagonia, III, 1910, 443. 



No specimens were secured. I have examined the type in the Berlin Museum 

 from Surinam. 



D. 18-19; A. 36-39; depth 2+ ; head 4; eight or nine seme between ventral 

 and vent; eye 2.5 in the head, interorbital 3.5; dorsal elevated anteriorly; adipose 

 small; scales about 34-85-27. Coloration uniform. 



