ANNOTATED LIST OF THE SPECIES 251 
15673, 1, 238 mm., Rio Pachitea, Allen, July, 1920. 
15675, 12, 108-195 mm., Iquitos, Allen, September, 1920. 
15676, 1, 134 mm., Manaos, Allen, December, 1920. 
15677, 6, 70-186 mm., Contamana, Allen, August, 1920. 
15678, 3, 102-160 mm., R. Ucayali, Orellana, Allen, August, 1920. 
15680, 15681, 21, 63-90 mm., Lago Cashiboya, Allen, August, 1920. 
15682, 15, 65-104 mm., Lago Cashiboya, Allen, August, 1920. 
15913, , Pebas, Steere. 
17726, 4, 76-91 mm., Iquitos, Morris, 1922. 
15674, 2, about 225 mm., locality unknown. 
The specimens under 15611, eight in number, have the caudal naked, two of 
the largest, about 185 mm., are female. The two specimens under 15674, about 
225 mm., have naked caudal and orange anal fin. Numbers 15673, 15675, 15676 
have the caudal scaled. Numbers 15677, 15678, 15680, 15681 have caudal both 
sealed and naked; 15674 has the anal orange. 
The younger specimens of this form are darker dorsally, with a faint indication 
of four or five dark, vertical bands down to or beyond the lateral line. The lighter 
colored members of the species have originated more frequently in the more turbid 
waters. The palometas in general are among the migratory species, found among 
those traveling upstream during rising waters, and spreading over the inundated 
bottom lands. 
Genus 118: MYLOPLUS Gill 
Myletes (non Cuvier) Miller and Troschel, 1845, Horae Ichth., I, 22; 
Ginther, 1864, Cat. Fish. Brit. Mus., V, 372 (part). 
Myloplus Gill, 1895, Proc. U. S. Nat. Mus., XVIII, 214; 
Eigenmann, 1912, Mem. Carnegie Mus., V, 390; 
Higenmann, 1915, Ann. Carnegie Mus., IX, 262. 
Myleus (in part) Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, IIT, 448. 
Type: Myletes asterias Miller and Troschel 
Orinoco and Guianas to Amazons and Paraguay 
Belly trenchant and serrate; teeth variable; premaxillaries with two series of 
teeth, not meeting; mandible with a pair of conical teeth; a procumbent predorsal 
spine present; gill-rakers short, lanceolate; adipose short, finrays not prolonged 
individually; dorsal rays 21-81; cheeks mostly naked; anal fin bilobed in male, 
faleate in female. 
308. MyLOPLUS RHOMBOIDALIS (Cuvier) 
Myletes rhomboidalis Cuvier, 1818, Mém. Mus. Hist. Nat., IV, 449, pl. xxu, fig. 3. 
Myletes parma Ginther, 1864, Cat. Fish. Brit. Mus., V, 374. 
Myleus parma Figenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 443. 
Myloplus rhomboidalis (in part) Norman, 1928, Proc. Zool. Soc. London, 827. 
