eigenmann: the cheirodontin^. 39 



second suborbital in contact with both the posterior and the lower limb of the pre- 

 opercle; mouth very oblique, maxillary-premaxillary border a little more than 

 orbital length; sixteen to twenty teeth on the maxillary, those on the posterior 

 half larger, pointing backward and outward; seven premaxillary teeth; mandible 

 with six or seven tricuspid teeth, the first and last distinctly larger than those 

 between ; in addition to these six or seven larger teeth several minute teeth appear 

 posteriorly. 



Origin of dorsal a little nearer to base of middle caudal rays than to the eye; 

 origin of anal in front of or under the dorsal; first developed anal ray heavy and 

 much prolonged, the second less so; outer ventral raj^ filiform; extending beyond 

 the origin of the anal, pectorals to near middle of the ventrals; pectorals placed 

 low, their base oblique, their shortest ray about one-half of the outer ray, which is 

 similar to the outer ventral and first developed anal ray. 



Scales everywhere regularly imbricate, with few radial striae; a series of very 

 small scales along the base of anal, caudal with a few scales at the base of the 

 lobes; axillary scales small. 



No definite markings, margin of anal in the male dusky. 



16. Prionobrama filigera (Cope). (Plate IV, fig. 4.) 



Aphyocharax filigerus Cope, Proc. Am. Philos. Soc, 1870, p. 564 (Pebas); Eigen- 

 mann & Eigenmann, Proc. U. S. Nat. Mus., Vol. XIV, 1891, p. 55; Fowler, 

 Proc. Acad. Nat. Sci. Phila., 1906, p. 334, fig. 23 (Pebas); Eigenmann, Reports 

 Princeton Univ. Exped. Patagonia, Vol. Ill, 1910, p. 429. 



Paragoniates ynulleri Steindachner, Ichthyol. Beitr., Vol. V, 1876, p. 72 (Obidos). 



Prionohrama viadeirm Fowler, Proc. Acad. Nat. Sci. Phila., 1913, p. 534, fig. 9. 

 (Tributary of Rio Madeira near Porto Velho, Brazil.) 



Bleptonema amazoni Eigenmann, Indiana University Studies, No. 20, 1914, p. 44 

 (Santarem) . 



Aphyocharax analis Nichols, Bull. Am. Mus. Nat. Hist., Vol. XXXIV, 1915, p. 127 

 (Manaos). 



Range : Amazons from Pebas to Villa Bella, Madeira basin. 

 5499a, C. M. Type of amazoni, 54 mm. 5599a-c, C. M., paratypes, 50-55 mm. 



Santarem. Dec. 9, 1909. Haseman. 

 21188, M. C. Z.,"' about 58 mm. Villa Bella, Jan. 1866. L. Agassiz. 

 21182, M. C. Z., twelve, largest 53 mm. Villa Bella, Jan. 1866. L. Agassiz. 

 21248, M. C. Z., seven, largest 51 mm. I^a. Jan. 1866. William James. 

 ^^ Anal filament reaching to base of last anal ray. A. 30; l.I. 39. 



