ANNOTATED LIST OF THE SPECIES 321 
Boulenger, 1887, Proce. Zool. Soe. London, 282, Canelos; 
Eigenmann and Kigenmann, 1891, Proc. U. 8. Nat. Mus., XIV, 61; 
Higenmann and Ward, 1905, Proc. Wash. Acad. Sei., VII, 162; 
EKigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, IIT, 448; 
Figenmann, 1912, Mem. Carnegie Mus., V, 439; 
Ellis, 1913, Mem. Carnegie Mus., VI, 148. 
Sternarchus maximilliant Castelnau, 1855, Anim. Amér. Sud, Poiss., 93, pl. xlv, fig. 4, Urubamba 
river. 
Orinoco, Guianas, Amazons, Rios Paraguay and Paranda 
15432, 1, 300 mm., Iquitos, Morris, 1922. 
446. AprTRRONOTUS LEPTORHYNCHUS Ellis 
Sternarchus leptorhynchus Ellis, 1912, in Eigenmann, Mem. Carnegie Mus., V, 439; 
Ellis, 1913, Mem. Carnegie Mus., VI, 147, pl. xxu, fig. 4; 
Eigenmann, 1922, Mem. Carnegie Mus., IX, 175, pl. xxxv, fig. 1. 
Colombia to Peru and British Guiana 
15434, 1, over 340 mm. (probably 100 mm. lost), Iquitos, Morris, 1922. 
Snout much elongated; gape also very long; anus beneath vertical limb of 
preopercle. 
Depth 1.16 in the head length; eye equidistant between snout and third fifth 
of the pectoral; distance between the eye and the upper angle of the gill-opening 
about 1.22 in the snout. 
It is a question whether this specimen may not be identical specifically with 
A. anas rather than with the more remote Guiana types. In the type of A. lepto- 
rhynchus 260 mm. in length the eye is nearer the tip of the snout than to the gill- 
opening, but in other characters such as depth it resembles the present species. 
There is a reasonable expectation of finding it here. 
447. AprpRoNoTUS ANAS Eigenmann and Allen, sp. nov. 
Plate XV, fig. 1 
15433, 1, 365 mm., type, Iquitos, Morris, 1922. 
Head 3.7; depth 2 in the head; eye nearer tip of pectoral than to tip of snout 
by one-seventh the length of the snout; distance between the eye and the upper 
angle of the gill-opening less than one-half the length of the snout; about 11 scales 
above the lateral line; origin of anal under the middle of the gill-opening; caudal 
peduncle short (normal?), blackish; a light, median dorsal line; caudal light in the 
middle, dark above and below. 
Near A. leptorhynchus Ellis, and differing most strikingly in the shape and 
proportions of the head, the eye being conspicuously farther back than in the type of 
leptorhynchus. 
448. APTERONOTUS BONAPARTII Castelnau 
Sternarchus bonapartii Castelnau, 1855, Anim. Amér. Sud, Poiss., 92, pl. xlv, fig. 2, Ucayali; 
Giinther, 1870, Cat. Fish. Brit. Mus., VIII, 3; 
Cope, 1878, Proc. Amer. Phil. Soe., XVII, 682, Peruvian Amazon; 
