eigenmann: the cheirodontin^. 31 



with tubes; eleven scales between dorsal and ventrals; nineteen predorsal scales; 

 depth of caudal peduncle 2.4 in the length of the head; height of dorsal 1.25; 

 height of anal 1.66; length of pectoral 1.33; ventral 1.6. 



Elongate, slender, fusiform; maxillary reaching to below anterior margin of 

 pupil; teeth conic, each usually with a very small or obsolete pointed basal cusp; 

 maxillary with about four conic teeth. 



Origin of dorsal midway between posterior nostril and base of caudal; origin 



Fig. 8. Aphyocharax avary Fowler. (After Fowler, Proc. Acad. Nat. Sc, Phila., 1913, p. 532.) 



of anal behind the vertical from the base of the last dorsal rays; origin of ventrals 

 well before the dorsal. 



A silvery lateral band; humeral spot crossing third, fourth, and fifth scales of 

 the lateral line; dorsal with a transverse median streak. Anal broadly whitish in 

 front; rest of fin sprinkled with dusky dots, the edge of the fin dark, the dark con- 

 tinued across the anal lobe. 



10. Aphyocharax rathbuni Eigenmann. (Plate III, fig. 5.) 

 Aphyocharax alburnus Eigenmann & Kennedy {non Giinther), Proc. Acad. Nat. 



Sci., Phila., 1903, p. 517. 

 Aphyocharax anisitsi (part) Eigenmann and Kennedy, Proc. Acad. Nat. Sci., 



Phila., 1903, p. 517. 

 Aphyocharax rathbuni Eigenmann, Proc. U. S. Nat. Mus., Vol. XXXIII, 1907, p. 



10. (Arroyo Chagalalina, Paraguay) ; Reports Princeton Univ. Exped. Pata- 

 gonia, Vol. Ill, 1910, p. 429. 

 Aphyocharax stramineus Eigenmann, Proc. U. S. Nat. Mus., Vol. XXXIII, 1907, 



p. 11 (Arroyo Trementina); Eigenmann, Reports Princeton Univ. Exped. 



Patagonia, Vol. Ill, 1910, p. 429. 



Range : Paraguay basin. 



