298 * Annals of the Carnegie Museum. 



ddd. Diameter of eye twelve times in the head to end of temporal plate; 

 postorbital part of head three and one-half times in the snout. 



3. hargreavesi Eigenmann. 

 dddd. Diameter of eye thirteen and one-half times in the head ; postorbital 



part of head two times in snout 4. natlereri Steindachner. 



cc. Distance from supra-occipital to base of first dorsal ray five and a 

 quarter to five and a half times in the total length. Diameter of eye 

 sixteen times in the length of the head. 

 e. Sides of snout concave; width of head thiee and a half to three and 



three-quarters in its length 5. oxyrhyncha (Kner.) 



ee. Head tapering regularly forward; width of head four and two-thirds 



times in its length 6. boliviana Steindachner. 



ccc. Distance from supra-occipital to base of first dorsal ray seven times in 

 the total length; eye thirteen times in head; length of postorbital 

 part of head two and seven-tenths times in the length of the produced 



part of snout 7. azygia Eigenmann & Vance, sp. nov. 



cccc. Distance from supra-occipital to base of first dorsal ray six and eight- 

 tenths times in total length; eye twelve times in the head; length of 

 post-orbital part of head two and a quarter times in the length of 



produced part of snout 8. smithi Fowler. 



bh. Length of produced part of snout three and seven-tenths to three and 

 eight-tenths times in the distance from its tip to the anus; distance from 

 supra-occipital to first dorsal ray five and a quarter times in the total 



length 9. kneri (Steindachner). 



bbb. Length of produced part of snout four and one-fifth times in the distance 

 from its tip to the anus; distance from supra-occipital to first dorsal 

 ray five and one-half times in the total length. 



10. jauriiensis Eigenmann & Vance, sp. nov. 

 bbbb. Length of produced part of snout about three and one-third times in the 

 distance from its tip to the anus. Distance from supra-occipital to base 

 of first dorsal ray six and one-fifth times in the total length. 



II. hasemani Eigenmann & Vance, sp. nov. 

 aa. Abdomen without median series of plates, except one or two anteriorly. 



/. Length of produced part of snout four to four and one-half times in the 



distance from its tip to the anus 12. acus (Kner). 



//. Length of produced part of snout three times in the distance from its tip 



to the anus 13. amazona (Giinther). 



fff. Length of produced part of snout two and one-third to two and one-half 

 times in the distance from its tip to the anus; eye sixteen to eighteen 



times in the head : .... 14. gladiolus (Giinther). 



ffff. Length of produced part of snout about two and one-half times in the dis- 

 tance from its tip to the anus; a median plate in front of the ventrals; 

 eye thirty-two times in the head; interorbital eight times in the head. 



15. pseudo gladiolus Steindachner. 



