74 Annals of the Carnegie Museum. 



3. Apareiodon aflinis (Steindachner). (Plate XI, fig. i.) 



Parodon afflnis Steindachner, Neue & Seltene Fisch-Arten, 1879, p. 20, pi. Ill, 

 fig. 3 (La Plata); Eigenmann & Eigenmann, Proc. U. S. Nat. Mus., Vol. 

 XIV, 1891, p. 49; Berg, An. Mus. Nac. Buenos Aires, Vol. V, 1897, P- 279 

 (Rio de La Plata; Paraguay); Boulenger, Trans. Zool. Soc. London, Vol. 

 XIV, 1896, p. 34 (North Paraguay); Bull. Mus. Torino, Vol. XII, 1897 (Caiza; 

 Mission de San Francisco). Eigenmann, Reports Princeton Univ. Exp. Pata- 

 gonia, Vol. Ill, 1910, p. 423; Eigenmann & Kennedy, Proc. Acad. Nat. Sci. 

 Phila., 1903, p. 512. 



Parodon paraguayensis Eigenmann, Proc. U. S. Nat. Mus., Vol. XXXIII, 1907, 

 p. 6 (Asuncion); Ann. Carnegie Mus., Vol. IV, 1907, p. 124, pi. XXXIX, fig. i, 

 1907 (Asuncion); Reports Princeton Univ. Exp. Patagonia, Vol. Ill, 1910, p. 423. 



Habitat. — La Plata Basin. 



6589 a~d, C. M. 128-138 mm. Sao Joao del Rei, Rio das Mortes, 

 emptying into Rio Grande, this into Parana. May 17, 1908. 

 Haseman. 



?57o6 a-c, C. M. 21-31 mm. Rio Paranahyba bridge, Aug. 15, 

 1908. Haseman. 



6591 a-f, C. M. 92-101 mm. Cacequy, Rio Ibicuhy, emptying into 

 Rio Uruguay. Feb. i and 2, 1909. Haseman. 



6590 a-t, C. M. 28-120 mm. Uruguayana, February 5, 1909. 

 Haseman n. 



6592 a-&, C. M. 91-106 mm. Asuncion, March 29, 1909. Haseman. 

 10237 a-n, I. U. M. 45-80 mm. Asuncion. Anisits. 



6594 a, C. M. Corumba. April 27, 1909. Haseman. 



6593 a-k, C. M. 87-112 mm. Villa Hayes. April 13, 1909. Hase- 

 man. 



9953 ^~o, I. U. M. 52-80 mm. Asuncion, Paraguay. Anisits. 

 9952 a-j, I. U. M. 76-96 mm. Asuncion, Paraguay. Anisits. 

 9975 (^~(^> !• U. M. Between 40 and 50 mm. Asuncion, Paraguay. 



Anisits. 



Head 3.5-4.5; depth 4.33-5.5; D. 11 or 12; A. 7 or 8; P. 12-14; 



40 41 42 43 44 , , , -1 



scales 4 , — , — , — , — ; 12 to 14 predorsal scales; eye 3.5-4 in the 



2 2 3 2 12 



head, snout 3, about equal to interorbital; width of mandible 5-5.5 



in the head. 



Origin of dorsal equidistant from tip of snout and tip of adipose or 



a little farther back; height of dorsal equal to the portion of the 



head in front of upper angle of gill-opening; margin of dorsal obliquely 



truncate, the highest ray extending beyond tip of last; adipose fin 



over the anal. 



