126 Annals of the Carnegie Museum. 



57. Cheirodon i?iterruptus (Jenyns). 

 PuertcTMax (part of 388). 



Seven specimens (473), Colonia Gonzales. 



58. Aphiocharax dentatus Eigenmann & Kennedy (Plate XXXIX., 



Fig. 3)- 



Nine specimens from Corumba (272, 282, 274, 367) one from 

 Puerto Max (386), and ten from a small tributary of the Rio Negro, 

 a tributary of the Rio Pilcomayo (443). 



Back deep^yellow, opercle golden. 



In the! original account of this species three typographical errors 

 •occur. For type No. "10030" read 10032, and under cotypes for 

 " 10030 and 10031 " read 10034 and 10,035. 



59. Hemigrammus luetkeni Boulenger. 

 (Part of 388), Puerto Max. 



Three specimens from a pond at Colonia Gonzales, at Villa Rica 

 (47o). 



60. Hemigrammus kennedyi Eigenmann. 



Two specimens from Corumba (327), and several from Puerto Max 



(389)- 



61. Hemigrammus ulreyi (Boulenger). 

 Specimens 34-40 mm. long, Corumba (328). 



62. Tetragonopterus argenteus Cuvier. Lambari. (Plate XL., Fig. 

 1.) Tetragonopterus chalceus Eigenmann & Kennedy, 1. c, 523. 



Eight specimens from Porto Murtmho (287). 

 Five specimens from Bahia Negra (383). 



63. Tetragonopterus alieni* Eigenmann & McAtee sp. nov. (Plate 



XL., Fig. 2). 



Mojarra Lambari. Type No. 10158, a specimen no mm., Cor- 

 umba (363). 



Cotype, No. 10159, a specimen 85 mm. Corumba (363); Cotype, 

 No. 10160, a specimen 95 mm., Rio Otuquis (372); Cotypes, No. 

 10161, two specimens, 60 and 95 mm., Ascuncion (280). 



This species agrees very closely with specimens of Astyanax multi- 

 radiatus from Ascuncion, Rio Paraguay, but differs notably in the 

 greater depth, and the sharp up-turn of the nape making the profile 

 distinctly a Tetragonopterus profile. It is very probable that Stein- 

 dachner's Tetragoiiopterus multiradiatus is a true Tetragonopterus, in- 

 asmuch as his largest specimens were but two inches long and yet had 



8 For J. A. Allen, of the American Museum of Natural History. 



