FISHES OF WESTERN SOUTH AMERICA 
bo 
a 
TS 
Subfamily: X1PHOSTOMINAE 
Hydrocyninae Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, IIT, 446, (here restricted 
to African genera). 
Niphostomidae Regan, 1911, Ann. Mag. Nat. Hist., (8), VIII, 13; 
Jordan, Evermann and Clark, 1928 (1930), Rept. U.S. Comm. Fish., Part IT, 100. 
Sarcodacinae (in part) Gregory and Conrad, 1938, Zoologica, X XIII, 338. 
Genus 141: XIPHOSTOMA (Agassiz) 
Hydrocynus and Hydrocyon Cuvier (in part), 1817, Régne Anim., IT, 167. 
NXiphostoma Agassiz, 1829, Sel. Gen. et Spec. Pisce. Bras., 60, 78; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, IIT, 446; 
Eigenmann, 1912, Mem. Carnegie Mus., V, 411; 
Jordan, 1917, The Genera of Fishes, 132 (Restricting Hydrocynus to the African forskdli 
Cuvier). 
Type: Niphostoma cuvierit Agassiz 
Guiana to the Peruvian Amazon 
Body long and cylindrical; snout and mandible much prolonged, forming a 
beak; both jaws with a series of minute conical teeth; dorsal fin in a posterior posi- 
tion, but nearer the level of the ventrals than to that of the anal; anal short; scales 
with denticulate margins; lateral line complete. 
357. XIPHOSTOMA MACULATUM (Cuvier and Valenciennes) 
Hydrocynus maculatus Cuvier and Valenciennes, 1848, Hist. Nat. Poiss., XXII, 509; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 446. 
Niphostoma maculatum Steindachner, 1882 (1883), Denksch. KIx. Akad. Wiss. Wien, XLVI, 15, Rio 
Huallaga, three specimens; 
Fowler, 1906 (1907), Proc. Acad. Nat. Sci. Phila., LVIII, 463. 
NXiphostoma taedo Cope, 1871 (1872), Proc. Acad. Nat. Sei. Phila., XXIII, 267, pl. xin, fig. 2, two, 
R. Ambyiacu, Hauxwell; 
Cope, 1878, Proc. Amer. Phil. Soc., XVII, 688, Marafion, Orton. 
Upper Amazons 
The garza-challua (challhua) or anas-challua of Steindachner, the former name 
aptly meaning heron-fish in allusion to the beak. 
Subfamily: ACESTRORHYNCHINAE 
Acestrorhamphinae Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, IIT, 447; 
Eigenmann, 1922, Mem. Carnegie Mus., V, 165. 
Acestrorhynchinae Eigenmann, 1912, Mem. Carnegie Mus., V, 406. 
Genus 142: ACESTRORHYNCHUS Eigenmann 
NXiphorhynchus Agassiz, 1829, Sel. Gen. et Spec. Pisce. Bras., 76, preoccupied in birds, 1827. 
NXiphorhamphus Miller and Troschel, 1845, Horae. Ichth., I, 17, preoccupied in birds, 1843. 
Acestrorhynchus Eigenmann, 1903, Smithson. Misc. Coll., XLV, 146; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, HI, 447; 
Rigenmann, 1912, Mem. Carnegie Mus., V, 406. 
