eigenmann: the FRESHWATER FISHES OF BRITISH GUIANA 461 



Hyaline; a black line from the upper edge of the base of the pectoral to the 

 middle of the caudal; a broader black line along base of the ventral ridge, a few 

 specks below the lateral black line, the scales of the sides above it with a marginal 

 row of chromatophores; scales of back frequently with one or more additional 

 chromatophores, of which a median one is most prominent; upper part of head 

 and area in front of pectorals dotted, the ventral ridge hyaline. 



Order SYNENTOGNATHI. 

 Family XVIII. BELONID.E. 75 



Potamorrhaphis Gunther. 

 Potamorrhaphis Gunther, Catalogue, VI, 1866, 256. 



Type, Belone tamiata Gunther. 



Long, needle-shaped fishes with produced snout. Dorsal rays subequal in 

 length, the anterior ones not forming a lobe. 



308. Potamorrhaphis guianensis (Schomburgk). 



Belone guianensis Schomburgk, Fishes Brit. Guiana, II, 1843, 131, pi. 1 (Guiana; 



Paduiri). 

 Potamorrhaphis guianensis Eigenmann, Repts. Princeton Univ. Exp. Patagonia, 



III, 1910, 463. 



Belone scolopacina Cuvier and Valenciennes, Hist. Nat. Poiss., XVIII, 1846, 428 

 (Rio de la Mana, Cayenne). — Gunther, Catalogue, VI, 1866, 256 (copied). 



Belone tceniata Gunther, Catalogue, VI, 1866, 256 (Rio Capin, Brazil). 



Potamorrhaphis tmniata Steindachner, " Ichthyologische Beitrage," iii, 1875, 68 

 (Amazon River at Teffe; Villa Bella; Porto do Moz; Santarem; Gurupa; 

 Hyavary River; Lake Manacapuru, etc.). — Eigenmann, Ann. Carnegie Mus., 



IV, 1907, 143 (Tuyuyu, Paraguay). 



76 Tylosurus almeida Quoy and Gaimard. 

 Tylosurus guianensis Muller and Troschel (not Belone guianensis Schomburgk), in Schomburgk, Reisen, 



III, 1848, 620 (coast of Guiana). 

 Belone truncala guianensis Gunther, Catalogue, VI, 1866, 245. 



Belone almeida Quoy and Gaimard, Voy. Uranie et Physicienne, Zool., 1824, 226 (Brazil). 

 Tylosurus almeida Eigenmann, Repts. Princeton Univ. Exp. Patagonia, III, 1910, 462. 

 Belone timucu Cuvier and Valenciennes, Hist. Nat. Poiss, XVIII, 1840, 420 (Rio de Janeiro); not Esox 



timucu Walbaum. 

 Belone truncala var. guianensis, Gunther, Catalogue, VI, 1800, 245. 



The specimens collected by Schomburgk and referred to by Muller and Troschel are actually this species, 

 not the Belone guianensis of Schomburgk. 



Eye 3 in the postorbital portion of the head; D. 1,12 or 13; A. 1,14 or 15; depth at the pectoral 5.5 in 

 the head. 



