294 PROCEEDINGS OF THE ACADEMY OF [June, 



Erythrinus unitaeniatus Agassi z. 



Erythrinus saJmoneus Cope, Proc. Amer. Philos. Soc. Phila., XVII, 1877-78 

 (May 17, 1878), p. 694. Peruvian Amazon. Prof. J. Orton. 



Head 3 to 3^; depth 3f to 4f ; D. ii, 8 i; A. ir, 7 i to ii, 9 i, usually 

 8 T and rarely 7 i or 9 i ; scales 30 to 32 in lateral line to base of caudal^ 

 and 3 to 6 more on latter ; 4 scales between origin of dorsal and lateral 

 line, rarely 5; 4 scales between lateral line and ventral; 13 or 14 scales 

 before dorsal, usually 14; snout 3f to 4 in head, measured from, tip of 

 upper jaw; eye 5 to 7f ; maxillary 2 to 2|-; interorbital space 2^ to 3; 

 total length 4 to 12 inches. In all 7 examples from the upper Amazons, 

 Surinam and Paramaribo. 



Subgenus ERYTHRINUS Scopoli. 



Dorsal fin angular or pointed, and some of posterior rays elevated. 



Erythrinus erythrinus (Schneider). 



Erythrinus hrevicanda Cope, Proc. Amer. Philos. Soc. Phila., XI, 1869-70 



(August 19, 1870), p. 566. Pebas. John Hauxwell. 

 Erythrinus brevicauda Cope, I.e., XVII, 1877-78 (May 17, 1878), p. 694. 

 Peruvian Amazon. Prof. J. Orton. 



Head 3 to 3^; depth 3| to 5; D. ii, 7 i to 9 i, rarely 7 or 8; A. iii, 

 8 i; scales 29 to 32 in lateral line to base of caudal, and 3 or 4 more on 

 latter ; 4 scales between origin of dorsal and lateral line obliquely back ; 

 3 or 4 scales between lateral line and ventral; 14 to 16 scales before 

 dorsal; snout 3 J to 4 in head, measured from tip of upper jaw; eye 4^ 

 to 6f ; interorbital space 2^ to 2f ; total length of body 3 to 9^ inches. 

 In all 10 examples from the Orton and Hauxwell collections. One 

 example shows the depressed ventral reaching a trifle beyond origin of 

 anal. 



Pyrrhulina laeta (Cope). Fig. 1. 



Holotaxis Icetus Cope, Proc. Acad. Nat. Sci. Phila., 1871 (January 16, 1872), 

 p. 257. Type No. 8,029, A. N. S. P. Ambyiacu River. John Hauxwell. 



As it is in such poor preservation I am forced to omit a number of 

 notes of value. It may be said however beyond dispute that there are 

 two distinct or well developed bands of teeth in the upper jaw. The 

 accompanying figure will portray such information as is possible to 

 make out from the specimen with the assistance of the original account. 



COPEINA gen. nov. 

 Tj^e Pyrrhulina argyrops Cope. 



Teeth in upper jaw uniserial, otherwise close to Pyrrhulina. 

 (Named for the late Prof. Edward Drinker Cope, who studied most 

 of the fishes included in this paper.) 



