ANNOTATED LIST OF THE SPECIES 327 
the anterior half of the anal, together with its entire posterior part, dark; a dark 
spot above the gill-opening. 
457. ADONTOSTERNARCHUS BALAENOPS (Cope) 
Sternarchus balaenops Cope, 1878, Proc. Amer. Phil. Soc., XVII, 682, Peruvian Amazon; 
Eigenmann and EKigenmann, 1891, Proc. U.S. Nat. Mus., XIV, 62. 
Sternarchella balaenops EKigenmann and Ward, 1905, Proc. Wash. Acad. Sci., VIT, 164; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 448; 
Ellis, 1913, Mem. Carnegie Mus., VI, 152. 
Peruvian Amazon 
Described by Cope, and not collected since his time. Differing from S. sachsi 
in the color, having ‘‘a pale dorsal band which reaches the dorsal thong, and a pale 
narrow band on each side near the dorsal band.” 
Subfamily: RHAMPHICHTHYINAE 
Genus 184: RHAMPHICHTHYS Miiller and Troschel 
Gymnotus (in part) Linnaeus, 1766, Syst. Nat., ed. xu, 427. 
Rhamphichthys Miller and Troschel, 1849, Horae Ichth., III, 15; 
Rigenmann and Eigenmann, 1891, Proc. U. S. Nat. Mus., XIV, 62; 
EKigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 449; 
Eigenmann, 1912, Mem. Carnegie Mus., V, 435; 
Ellis, 1913, Mem. Carnegie Mus., VI, 137. 
Type: Gymnotus rostratus Linnaeus 
The Guianas to Peru and La Plata 
Snout long and tubular; without teeth; body greatly elongate and compressed ; 
no caudal fin; anus in front of the vertical from the eye; origin of anal fin forward 
of the vertical from the gill-opening; body entirely scaled, scales minute and cy- 
cloid; caudal appendage large and scaled; eyes small and overgrown by the skin; 
mouth small. 
KEY TO THE SPECIES OF THE GENUS RHAMPHICHTHYS 
a. Snout longer, the postorbital part of the head 3 in the total length of the head; the eye much 
farther from the base of the pectoral than from the snout............. _....rostratus 
aa. Postorbital part of head 2.4 in head length; eye equidistant from snout and pectoral basis 
Re SR Fe Re Meo Se! arepand nee Stee SM aera c In eel emer te ay Pel ok eens marmoratus 
458. RHAMPHICHTHYS ROSTRATUS (Linnaeus) 
Gymnotus Gronow, 1754, Mus. Ichth., no. 73. 
Gymnotus rostratus Linnaeus, 1766, Syst. Nat., ed. xii, I, 428. 
Carapus rostratus Cuvier, 1817, Regne Anim., IT, 237. 
Rhamphichthys rostratus Miller and Troschel, 1849, Horae Ichth., IIT, 15; 
Ginther, 1870, Cat. Fish. Brit. Mus., VIII, 5; 
Jigenmann and Ward, 1905, Proc. Wash. Acad. Sci., VII, 168; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, IIT, 449; 
Ellis, 1913, Mem. Carnegie Mus., VI, 137. 
