ANNOTATED LIST OF THE SPECIES 229 
266. CTENOBRYCON HAUXWELLIANUS (Cope) 
Telragonopterus hauxwellianus Cope, 1870, Proc. Amer. Phil. Soc., XI, 560, Pebas, collected by 
Hauxwell; 
Cope, 1878, Proc. Amer. Phil. Soc., X VII, 691, Peruvian Amazon, Orton collection. 
Astyanax hauxwellianus Fowler, 1906 (1907), Proc. Acad. Nat. Sci. Phila., LVITT, 340, fig. 28. 
Ctenobrycon hauxwellianus Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, IIT, 435; 
Eigenmann, 1927, Mem. Mus. Comp. Zool., XLIII, iv, 331, pl. xxxu, fig. 2; pl. xevili, fig. 7; 
Fowler, 1939 (1940), Proc. Acad. Nat. Sei. Phila., XCI, 264, one, 80 mm. long, lower Ucayali, 
at Boca Chica. 
The Amazons to Paraguay and Bolivia 
15874, 5, 47-63 mm., Rio Ucayali, Contamana, Allen, August, 1920. 
15875, 34, 33-63 mm., same data. 
15876, 1, 56 mm., Yarinacocha, Allen, August, 1920. 
15882, 1, 65 mm., mouth Rio Pacaya, Allen, September, 1920. 
15883, 4, 37-60 mm., Gosulimacocha, Allen, October, 1920. 
15884, 10, 36-59 mm., creek, Yurimaguas, Allen, November, 1920. 
Occurring in great abundance in certain localities; more than fifty taken by 
Bourget at Tabatinga, fifty-nine by Orton, numerous specimens by Pearson in the 
Beni. 
Compressed extremely; dorsal profile with ‘‘a distinct hump’’; ventral profile 
arched extremely and regularly, deepest point at the origin of the anal; the anal 
basis straight. Silvery lateral band interrupted by a faint vertical humeral spot 
about the 4th or 5th lateral line scale. Preventral scales serrate. Rakers on lower 
part of first arch appear to be ten in number and of less length than the corre- 
sponding gill-filaments. 
Genus 1083: HEMIGRAMMUS Gill 
Hemigrammus Gill, 1858, Ann. Lyc. Nat. Hist. N. Y., VI, 416; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 435; 
Eigenmann, 1912, Mem. Carnegie Mus., V, 331; 
Eigenmann, 1918, Mem. Mus. Cemp. Zool., XLII, 1, 135. 
Type: Poecilurichthys unilineatus Gill 
Orinoco, Trinidad, Guiana southward to Paraguay 
Fishes small to minute in size; premanillary teeth in two rows; maxillary teeth 
wanting, or at least reduced in number and restricted to the upper part of its free 
margin; lateral line incomplete; caudal scaled; a genus of uncertain boundaries and 
rapid evolution at the present time. 
267. HEMIGRAMMUS SCHMARDAE (Steindachner) 
Tetragonopterus schmardae Steindachner, 1882 (1883), Denksch. Kix. Akad. Wiss. Wien, XLVI, 
37, pl. vil, fig. 6, Tabatinga; 
Jigenmann and Eigenmann, 1891, Proc. U.S. Nat. Mus., XTV, 54. 
Hemigrammus schmardae Fowler, 1906 (1907), Proc. Acad. Nat. Sei. Phila., LVIII, 335, Peruvian 
Amazon; 
