234 



THE AMERICAN CHARACIDAE. 



but falling short in the adult ; pectorals reaching beyond origin of ventrals but 

 not to tip of axillary scale. 



A narrow, silvery lateral band, an obscure vertical humeral spot and a 

 similar caudal spot. 



Vertebrae 11 +22. 



Second air-bladder oblique conical, tapering abruptly into a vermiform 

 appendage, its entire length not twice that of the anterior air-bladder, its diam- 

 eter rather greater than the diameter of the eye, one half of its length exclusive 

 of the appendage. Alimentary canal about equal to the entire length, filled 

 with bivalves in the one dissected . 



The humping of the nape in this species as well as in A. hauxwellianus, is 

 caused in part by the development of a large adipose body in the space between 

 the occipital crest and the musculature of the dorsal fin. The specimens were 

 first preserved in formalin and it may be that the feeble denticulation of the 

 scales is due to the action of the preservative and that this species is congeneric 

 with A. hauxioellianus. 



3. AsTYANAX (PoEciLumcHTHYs) PELLEGRINI (Eigenmanii and Kennedy). 



Plate 40, fig. 5. 



Poeciluriclilhys muUiradiaius Eigenmann & Kennedy, {lum Tclragonoplerus multirailiafun Stcind.), 



Proc. Acad. nat. sci. Phil., 1903, p. 521 (Asuncion). 

 AsU/anax 7nidiiradiahis Eigenm.vnn & Ogle, Proc. U. S. N. M., 1907, 33, p. 29 (Paraguay). 

 Astymiax pellegrini Eigenm.\nn & Kennedy, Ann. Carnegie niu.s., 1907, 4, p. 136, pi. 40, fig. 3 (Bahia 



Negra); Eigenmann, Kept. Princeton univ. expcd. Patagonia, 1910, 3, p. 432. 



Habitat. — Paraguay Basin. 



