1915.] NATURAL SCIENCES OF PHILADELPHIA. 233 



Corydorus paleatus (Jenyns). 



Many from the Rio Jacuhy, Brazil. 



LORICARIID^. 

 PLECOSTOMIN.E. 



Plecostomus plecostomus (Linnaeus). 



One from Surinam (Hering). A large example (418 mm. long 

 without caudal), no data, is evidently identical* 



Plecostomus commersonnii (Valenciennes). 



Rio Jacuhy. 

 Plecostomus aspilogaster Cope. 



Proc. Amer. Philos. Soc. Pliila., XXXIII, 1894, p. 100, PL 8, fig. 14. Rio 

 Jacuhy, Brazil. 



Nos. 21,781 to 84, A. N. S. P., cotypes. Rio Jacuhy, Brazil. 



H. H. Smith. This is evidently a distinct species, and not at all 



to be confused with P. commersonnii, as questioned by Regan.^^ 



It would clearly fall with the species P. verres, P. carinatus and 



P. vaillanti, according to Regan's key, where the character shared 



in common is "supraoccipital bordered posteriorly by a median 



scute, and by one or more on each side." It differs from all three 



of these species in having the 1. 1. 30, and the lateral keels weak. 



Plecostomus emarginatus (Valenciennes). 



Plecostomus scopularius Cope, Proc. Acad. Nat. Sci. Phila., 1871, p. 55. 



Amazon above mouth of Rio Negro. 

 Plecostomus biseriatus Cope, I.e., p. 285, PI. 16. Amazon. 

 Plecostomus virescens Cope, l.c, 1874, p. 137. Upper Amazon. 



No. 8,081, A. N. S. p., type of P. scopularius Cope. Amazon 

 above mouth of Rio Negro. R. Perkins. 



No. 8,279, A. N. S. P., type of P. biseriatus Cope. Amazon. 

 R. Perkins. 



Nos. 21,280 to 83, A. N. S. P., cotypes of P. virescens Cope. Peru- 

 vian Amazon. J. Orton. 



Also small example from Peru obtained by Orton. 



Pterygopliclithys multiradiatus (Hancock). 



Liposarcus varius Cope, Proc. Acad. Nat. Sci. Phila., 1871, p. 284. Ambyiacu 



River. 

 Liposarcus jeanesianus Cope, I.e., 1874, p. 135. Nauta. 



No. 21,931, A. N. S. P., type of L. varius Cope. Ambyiacu River, 

 Ecuador. J. Hauxwell. 



Nos. 21,925 and 26, A. N. S. P., paratypes. Amazon from mouth 

 of Rio Negro to Peru. R. Perkins. 



»5 Trans. Zool. Soc. London, XVII, pt. 3, 1904, p. 206. 



