84 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. ixxi. 



head, the height of anterior rays about 1.5 in head; external rays of 

 ventral and anterior rays of anal scabrous; head short, eye compara- 

 tively largo; snout short and somewhat blunt; lower jaw much shorter 

 than upper; 3 teeth on inner surface of upper end of maxillary; 2 

 rows of teeth on premaxillarics and 1 on mandible; all teeth 3-pointed, 

 the middle point largest. 



Color, after preservation in formalin, then in alcohol, light greenish 

 gray; an indistinct, broad silvery lateral stripe; an indistinct, vertical, 

 duskv shoulder spot; no spot on caudal peduncle; tips of dorsal, anal 

 and caudal rays fainth^ dusky. 



Type. — No. 55570, U.S.N.M., a specimen about 3 inches long (76 

 mm.) from Rio Primero, Province of Cordoba. 



Cotype. — No. 11071, Ind. Univ. Mus., about 2,87 inches (73 mm.) in 

 total length; head tt. 06; depth 3.21; eye 3.33; snout 4.28; interorbital 

 3; D. 9; A. 18; scales 6-37-5. Ventral reaching vent. Color similar 

 to tj^pe, the lateral silvery stripe more distinct; shoulder spot fainter; 

 anterior half of anal membrane dusky between the rays. 



Named for Dr. Carl H. Eigenmann, in recognition of his valual)le 

 work on the Characins. 



22. XIPHORHAMPHUS JENYNSII Giinther. 



Ilydrocyon hepsetus, Jenyns, Zool. Voy. Beagle, Pt. 4, Fish, 1842, p. 128 



(Maldonado) ; not of Cuvier. 

 Xiphorhamphns jenynsll Gunther, Cat., V, 1864, j). 356 (after Ilydrocyon hepsetus, 



Jenyns). 



Our collection contains 2 specimens of Xiphorhamphus which agree 

 ver}^ well with Jenyns^ description of Ilydrocyon hepsetus., which 

 species Gunther has considered distinct from II. hepsetus of Cuvier 

 and has described under the name Xiphorhamphus jeiiynsll. 

 Eigenmann and Eigenmann " include X. jenynsii in the sj^nonj^my of 

 X. hi;pxetus Cuvier, the reason for which we are not able to understand. 

 X. jenynsli has fewer anal rays and fewer scales in longitudinal series. 

 The following data are given by Jenyns: Length ■k.'io inches; head in 

 length without caudal 3.5; depth 3.5; eye in head not quite 4; D. 11; 

 A. 25; scales 57 or 58-16. 



The corresponding measurements in our 2 specimens are: Total 

 length 8.75 and 8.87 inches; head 3.71 and 3.73 in length without 

 caudal; depth 3.30 and 3.36; eye 5.15 and 5 in head; snout 3.76 and 

 3.75; D. 11; A. 25; scales 10-55-6 and 10-56-6; in the first the upper 

 profile of the head slopes straight from the nape, in the second this 

 outline is somewhat concave; teeth on the maxillary of uniform size; 

 large on premaxillary and in front of lower jaw; longest dorsal ray 

 1.32 and 1.10 in head; longest anal ra}" 1.88 and 1.15 in head; pectoral 

 1.32 and 1.15; ventral 1.75 and 1.80. 



«Proc. U. S. Nat. Mus., XIV, p. 58. 



