134 MEMOIRS OF THE CARNEGIE MUSEUM. 



moderate, covered by a transparent membrane. Scales small, cycloid; lateral line 

 straight, complete, rather obscure in caudal region. Origin of anal about the 

 length of the pectoral behind the vertical from the gill-opening; caudal appendage 

 long and slender. 



Fig. 7. Hypapomus breviwslris (Steindachner). 



Species of Hypopomus. 



a. Caudal peduncle 4.5 to 5 in the total length; length of the head just equal to, or usually less than, the 

 greate.st dcjith of the body; head somewhat truncate, 8.25 to 9.25 in the length to the end of the anal; 



eye about 2.5 in the interoeular distance brevirostris. 



aa. Caudal peduncle 3 to 3.5 in the total length; length of the head just equal to, or usually greater than, the 

 greatest depth of the body; head somewhat pointed, 7.5 to 10 in the length to the end of the anal; eye 

 not more than 2 in the interoeular distance , artedi. 



9. Hypopomus brevirostris (Steindachner). 



Rhamphichthys brevirostris Steindachner, Die Gymnotida?, 6, pi. II, fig. 2, 1868 

 (Guapore); GiJNTHER, Cat., VIII, 6, 1870; Steindachner, Fisch-f. Cauca 

 and Guayaquil, 37, 1880 (Santarem, Cauca, Rio Guapore); Perugia, Ann. 

 Mus. Civico Storia Nat. Genova, Ser. 2, Vol. X, 56, 1891 (Central Chaco) ; 

 BouLENGER, Trans. Zool. Soc, XIV, 1896, 38 (Descalvados). 



BrachyrJumiphichthys brevirostris Eigenmann and Eigenmann, Proc. U. S. Nat. 

 Mus., XIV, 1891, 62; Eigenmann, Ann. N. Y. Acad. Sci., VII, 1894, 625 

 (Lower Amazon and Itaituba on the Tocantins). 



Hypopomus brevirostris Eigenmann and Kennedy, Proc. Acad. Nat. Sci. Phila., 

 1903, 530 (Campo Grande, Arroyo Chagalalina) ; Eigenmann and Ward, 

 Proc. Wash. Acad. Sci., VII, 170, 1905 (Cauca, Amazon and tributaries, 

 Paraguay); von Ihering, Os Peixes do Brazil, 1907 (Amazonas) ; Eigenmann, 

 Repts. Princeton Univ. Exp. Patagonia, III, 449, 1910 (Cauca, Guiana to 

 Paraguay). 



10055 I. U. M., two, 140 and 150 mm. Campo Grande. 

 10057 I. U. M., two, 50 and 65 mm. Arroyo Chagalalina. 

 10054 I. U. M., one, 140 mm. Matto Grosso. 

 5097 I. U. M., six, 70-105 mm. Itaituba, Brazil. 

 5095 I. U. M., two, 90 and 100 mm. Lower Amazon. 



