SOUTH AMERICAN NEMATOGNATHI. 411 



363. Plecostomus liitkeni. 



Plecostomus lima Steindachuer, SB. Ak. Wien, Ixxiv, 1876, Siisswas- 

 serfische siidostlichen Brasiliens, iii, 121 (Rio Parahyba; Kio 

 Mucuri; St. Antonio; Kio Quenda; Kiode Pedra) (not Liitken), 



Plecostomus liitkeni Steindachner, Siisswasserfische siidostlichen 

 Brasiliens, iv, 1877, 1 (Kio Parahyba; Rio Mucuri; Rio San An- 

 tonio; Rio Quenda; Rio de Pedra). 



Habitat: Southeastern Brazil. 



Body very broad, depressed, the depth If in the width. 

 Head flat above; sides of the snout deeply concave; oc- 

 cipital rounded or obtusely pointed behind; superciliary 

 edge not raised. 



Eye 3|-4 in the snout, 5-J--7 in the head, 2-2-J- in the 

 interorbital. 



Posthumeral keel not continued posterior to the origin 

 of the ventrals. 



Lateral plates without a trace of a keel . 



Tip of the snout with a broad naked area; a large tri- 

 angular patch of granules between rictus and gill-open- 

 ing; usually a narrow strip between the pectoral spines 

 granular, a few granules on sides of belly, the ventral 

 surface otherwise naked. 



Last dorsal ray little more than half as long as the first. 



Upper portion of the head closely covered with brown 

 spots, a few spots on the body; dorsal fin dusky or more 

 often with large dark spots; caudal uniformly plain 

 dusky; ventrals and pectorals spotted with dark; ventral 

 surface plain; upper surface of the body sometimes with 

 obscure light spots. 



Head 3-3f ; Lat. 1. 26-28. 



Twenty-five specimens .12-.30 m. San Antonio River; 

 Campos. 



364. Plecostomus vermicular is, 



Plecostomus vermicularis Eigenm. & Eigenm. Proc. Cal. Acad. 2d 

 Ser. i, 170, 171, 1888 (Rio Parahyba; Rio Janeiro; Mendez; 

 Macacos; Goyaz). 



Habitat: Eastern Brazil. 



This species is closely related to PL liitkeni Steind. 



