390 FISHES OF WESTERN SOUTH AMERICA 
exposed; branchial spines short and few in number, 7-8; scales ctenoid, moderate 
in size, 44-51 on the lateral line; lateral line scales larger than others adjacent; 
dorsal fin with 15-16 spines, anal 8-10. 
498. UARU AMPHIACANTHOIDES Heckel 
Uaru amphiacanthoides Heckel, 1840, Ann. Wiener Mus., II, 331; 
Giinther, 1862, Cat. Fish. Brit. Mus., IV, 302; 
Eigenmann and Bray, 1894, Ann. N. Y. Acad. Sci., VII, 612; 
Pellegrin, 1903 (1904), Mém. Soc. Zool. France, XVI, 249; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 469. 
Acara (Heros) amphiacanthoides Steindachner, 1875, Sitzb. IIx. Akad. Wiss. Wien, LXXI, 94. 
Astronotus (Uaru) amphiacanthoides Eigenmann and Eigenmann, 1891, Proc. U. 8. Nat. Mus., 
XIV, 69. 
Peruvian and Brazilian Amazons 
15989, 3, 93-100 mm., Iquitos, Morris, 1922. 
17776, 3, 180-185 mm., Manaos, Allen, December, 1920. 
17788, 2, 111 and 144 mm., Contamana, Allen, August, 1920. 
17791, 1, 148 mm., Lago Cashiboya, Allen, August, 1920. 
499. UARU IMPERIALIS (Steindachner) 
Acara (Heros) imperialis Steindachner, 1879, Sitab. Kix. Akad. Wiss. Wien, LX XX, 161; 
Uaru imperialis Pellegrin, 1903 (1904), Mem. Soe. Zool. France, XVI, 249; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 469. 
Middle course of the Amazon 
17777, 6, 142-170 mm., Manaos, Allen, December, 1920. 
Not in our territory. 
Genus 203: ASTRONOTUS Swainson 
Astronotus Swainson, 1839, Fish. Amph. Rept., I, 229; 
Pellegrin, 1903 (1904), Mém. Soc. Zool. France, XVI, 146; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, IIT, 470. 
Astronotus (Astronotus) Eigenmann and Higenmann, 1891, Proce. U.S. Nat. Mus., XIV, 68. 
Acara (in part) Heckel, 1840, Ann. Wiener Mus., IT, 338. 
Type: Lobotes ocellatus Spix 
The Guianas to the Paraguay basin 
Body oval, broad; head obtuse, mouth large, opening obliquely, the lower jaw 
longer; teeth strong in front, small on the sides; dorsal, anal, and caudal fins scaled; 
pectoral and caudal rounded, ventral pointed; lateral line interrupted; preopercle 
crenated. 
500. ASTRONOTUS OCELLATUS (Spix) 
Lobotes ocellatus Spix, 1829, Sel. Gen. et Spec. Pisce. Bras., 129, pl. Ixviii. 
Astronotus ocellatus Swainson, 1839, Fish. Amph. Rept., IT, 229; 
Pellegrin, 1903 (1904), Mém. Soe. Zool. France, XVI, 182; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, ITI, 470; 
