144 MEMOIRS OF THE CARNEGIE MUSEUM. 
15. Sternarchorhamphus macrostomus (Giinther). 
Sternarchus macrostomus GUNTHER, Cat., VIII, 4, 1870 (Xeberos). 
Rhamphosternarchus macrostomus Cork, Proc. Am. Philos. Soe., 1878, 682 (Peruvian 
Amazon). 
Sternarchorhynchus macrostomus EIGENMANN AND EIGENMANN, Proc. U. 8. Nat. 
Mus., XIV, 1891, 62. 
Sternarchorhamphus macrostomus EIGENMANN AND Warp, Proc. Wash. Acad. Sci., 
VII, 1905, 166 (Peruvian Amazon); EIGENMANN, Repts. Princeton Univ. 
Exp. Patagonia, III, 1910, 449 (Peruvian Amazon). 
“Snout produced into a long, nearly straight tube, the small eye being mid- 
way between the roots of the pectoral and the extremity of the snout. Cleft of 
the mouth wide; more than half the length of the snout. Mandible with a series 
of fine teeth on each side. Vent somewhat behind the vertical behind the eye; 
anal fin commencing in front of the gill-opening; the greatest depth of the body 
is two-thirds the length of the head; scales on the back and ventral parts very small, 
those in the middle of the side of moderate size; uniform blackish-brown; pos- 
rior part of the anal and caudal black with whitish markings. A. 202.” (From 
Giinther.) 
This species is found only in the upper Amazon. 
XI. ORTHOSTERNARCHUS genus nov. 
Type, Sternarchus tamandua Boulenger. 
Distinguished from the other Sternarchine by the long dorsal thong which 
has its origin above or slightly behind the pectorals, by the long, straight, tubular 
snout and by the minute eyes and very short gape. Other characteristics much 
as in Sternarchorhamphus. 
Fia. 11. Orthosternarchus tamandua (Boulenger). 
16. Orthosternarchus tamandua (Boulenger). 
Sternarchus tamandua BouLENGER, Trans. Zoél. Soc., XIV, 427, Plate XLII, 1898 
(Rio Jurua, tributary of the Amazon). 
Sternarchorhamphus tamandua EIGENMANN AND Warp, Proc. Wash. Acad. Sci., 
VIT, 166, 1905 (Rio Jurua); von Inerine, Os Peixes do Brazil, Part 1 A, 
