144 MEMOIRS OF THE CARNEGIE MUSEUM. 



15. Sternarchorhamphus macrostomus (Giinther). 



Sternarchus macrostomus Gunther, Cat., VIII, 4, 1870 (Xeberos). 

 Rhamphosternarchus macrostomus Cope, Proc. Am. Philos. Soc, 1878, 682 (Peruvian 



Amazon). 

 Sternarchorlnjnclms macrostomus Eigenmann and Eigenmann, Proc. U. S. Nat. 



Mus., XIV, 1891, 62. 

 Sternarchorhamphus macrostomus 'EiGEi<iMA^'S ANH Ward, 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 

 Gunther.) 



This species is found only in the upper Amazon. 



XL OrthosternArchus genus no v. 



Type, Sternarchus tamandua Boulenger. 



Distinguished from the other Sternarchinse 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. 



Fig. 11. Orlhosternarchus lamandua (Boulenger). 



16. Orthosternarchus tamandua (Boulenger). 



Sternarchus tamandua Boulenger, Trans. Zool. Soc, XIV, 427, Plate XLII, 1898 



(Rio Jurua, tributary of the Amazon). 

 Sternarchorhamphus tatnandua Eigenmann and Ward, Proc. Wash. Acad. Sci., 



VII, 166, 1905 (Rio Jurua); von Ihering, Os Peixes do Brazil, Part 1 A, 



