172 EIGENMANN AND WARD 



b. Ventral profile much more strongly convex than dorsal; head 



strongly compressed, triangular in profile ; upper profile of 

 head nearly straight, a slight depression over eyes ; eye nearly 

 2 in snout; snout 3 to 3.25 in head; interorbital 3.25 to 3.7; 



width of head 2 to 2.25 Jmmboldtii^ 22. 



bb. Dorsal and ventral profiles equally convex; head less com- 

 pressed ; upper profile of head straight ; eye nearly 2 in snout ; 

 snout 3 in head; interorbital about 3 ; width of head 1.75 to 



2 in its length virescens^ 23. 



aa. Maxillary about twice width of orbit. 



c. Eye 2 in snout ; jaws equal ; anal beginning below posterior third 



of pectoral ; a large blackish spot at origin of lateral line ; 



A. 212 axillaris^. 24. 



cc. Eye 2.5 in snout; lower jaw longer than upper; anal beginning 

 below^ origin of pectoral ; color uniform ; A. 230. 



troschelii^ 25. 



21. EIGENMANNIA MACROPS (Boulenger). 



Sternopygus 7jiacrops Boulenger, Ann. Mag. Nat. Hist. (6), 

 XX, 305, Polaro River, British Guiana. 



22. EIGENMANNIA HUMBOLDTII (Steindachner). 



Sternopygus humboldtii Steindachner, Fisch-f. Magd. Str. 

 55, pi. XIV, 1878, Magdalena ; id. Flussf. Siidam., i, 21, 

 1879 (Mamoni R. at Chepo) ; id. Fisch-fauna Cauca and 

 Guayaquil, 36, 1880 (Cauca) ; Eigenmann & Eigenmann, 

 Proc. U. S. Nat. Mus., XIV, 1891, 62 ; Steindachner, Denk. 

 Akad. Wiss.Wien, LXXII, 147, 1902 (Baranquilla on Rio 

 Magdalena). 



Cry^tofs htimbohitu\ Eigenmann, Ann. N. Y. Ac. Sci., VII, 

 1894, 625 (Marajo.). 



Eigenmannia Jmmboldti\ Jordan & Evermann, Fishes North 

 and Mid. Amer., 341, 1896. 

 Habitat: ]Marajo, Magdalena and Mamoni. 



23. EIGENMANNIA VIRESCENS (Valenciennes). 



Sternarchus vircsccns Valenciennes, in d'Orb., Vov. Am. 

 Merid., Poiss., 11, pi. 13, fig. 2, 1847. 



' Steindachner considers this identical with trosc/tclii. 



