1915.] NATURAL SCIENCES OF PHILADELPHIA. 221 



scutes, whereas in the smaller example and the dried skin the first 

 three spinescent lateral scutes are embraced. The Rupununi 

 specimens also show the humeral plate extending a little further 

 back. 



Doras brachiatus Cope. 



Proc. Acad. Nat. Sci. Phila., 1871 (1872), pp. 270, 292. Maranon River. 



No. 8,342, A. N. S. P., type. Between the mouth of the Rio 

 Negro and the Peruvian Amazon. R. Perkins. 



Doras cataphractus (Linn»us). 

 Surinam. 



Doras weddelli Castelnau. 



Doras gryphus Cope, I.e., p. 270, PI. 15, figs. 1-la. Ambyiacu River, 

 Ecuador. 



Nos. 8,345 and 16,460, A. N. S. P., cotypes of D. gryphus Cope. 

 Ambyiacu River, Ecuador. J. Hauxwell. 



Doras pectinifrons Cope. 



Proc. Amer. Philos. Soc. Phila., XI, 1870, p. 568. Pebas, Ecuador. 



No. 8,346, A. N. S. P., type. Pebas, Ecuador. J. Hauxwell. 



Doras monitor (Cope). 



ZathorcLv monitor Cope, Proc. Acad. Nat. Sci. Phila., 1871 (1872), p. 272, 

 PI. 4, fig. 1. Ambyiacu River, Ecuador. 



Nos. 8,276 and 77, A. N. S. P., cotypes of Z. monitor Cope. Am- 

 byiacu River, Ecuador. J. Hauxwell. 



Doras nauticus (Cope). 



Zathorax nauticus Cope, Proc. Acad. Nat. Sci. Phila., 1874, p. 133. Nauta, 

 Ecuador. 



Nos. 21,390 to 95, A. N. S. P., cotypes of Z. nauticus Cope. Nauta, 

 Ecuador. J. Orton. 



Oxydoras niger (Valenciennes). 



lihinodoras prionomus Cope, Proc. Acad. Nat. Sci. Phila., 1874, p. 134. 

 Nauta, Ecuador. 



No. 21,203, A. N. S. P., type of R. prionomus Cope. Nauta, 

 Ecuador. J. Orton. 



Also two examples from the Maranon between mouth of Rio Negro 

 and Peru. 



AUCHENIPTERIN.^. 

 Centromochlus heckelii (Filippi). 



One from Peruvian Amazon. Also six from Manaos harbor, 

 Brazil, in April, 1913 (E. A. Smith), where known as "Caratay." 



