SOUTH AMERICAN NEMATOGNATHI. I7l 



20. Plecostomus auroguttatus (Kner.) 



H. asperatus Castelnau. 



21. Plecostomus liitkenii Steindachner. 



Localities: Sau Autouio Kiver; Campos. 



22. Plecostomus vermicularis sp. uov. 



Types, Nos. 7814; 7848; 7841jl; 7850; 7851; 7857. Thirty-seven speci- 

 mens. .08 — .30m. Rio Parahyba; Rio Janeiro; Mendez; Macacos; 

 Goyaz. 



This species is closely related to PL lutkeni Steind. 



The ventral surface in the adult is almost entirely cov- 

 ered with granules, except a large naked area at base of 

 ventrals; the anus is surrounded with granules. In the 

 young, the belly is almost wholly naked, there being only a 

 few granules in front of the anus, on the sides of the 

 belly and on the throat. 



The spots on the head frequently coalesce into vermicu- 

 lations; all the fins are profusely spotted with dark, the 

 spots on the dorsal, pectoral and ventral fins sometimes 

 coalescing into cross bars, those on the caudal forming reg- 

 ular transverse series. Upper surface of the body with 

 obscure markings, ventral surface plain. 



Eye 3-4 in the snout, 5.|-8 in the head, 2-2| in the inter- 

 orbital. Lat. 1. 26-27. Head 3-3f. 



23. Plecostomus brevicauda Giintber 



24. Plecostomus robinii Cuv. & Vai. 



PI. una; Steiudacliner. 

 Locality: Rio Una. 



25. Plecostomus wuchereri Guutber. 



Locality: Rio Pedra. 



26. Plecostomus johnii Steindachner. 



Localities: Rio Preto; Rio Puty. 



NeOPLECOSTOMUS SUBGEN. NOV. 

 Type Plecostomus microps Steindachner. 



27. Plecostomus microps Steindachner. 



Localities: Juiz de Fora, Rio Parahyba; Goyaz. 



28. Plecostomus granosus (Cuv. & Val.) 

 ? Plecostomus watwata Hancock. 



