NO.US2. ARGENTINA FISHE^-EVERMANN AND KENDALL. 95 



Named for Alberto Perugia, of the Natural History Museum of 

 Genoa, in recognition of his work on South American fishes. 



Perugia describes a specimen from Montevideo as doubtfully At/ier- 

 iniddhys 'vomerina Cuvier and Valenciennes. 



Athertna vomerina Cuvier and Valenciennes was from Mexico, and 

 is now considered identical with ^1. kumboldtiana of the same authors, 

 and as ])elonging to the genus Chirostoma, with which the generic 

 name Athermichthys must be considered synonymous, since it was 

 based on A. vomerina. 



Berg also records Atherimchthys vomerina.^ regarding- whitli he says 

 that it affects salt water, and is rarely found in the mouths of rivers 

 and those lakes which have immediate communication with the Atlantic 

 Ocean; that it is distinguished from other species which reach a con- 

 siderable size in ha\'ing 2 or 3 groups of small teeth on the vomer, in 

 some examples, abnormalh', a single group. He states that he had 

 some examples in which the upper lobe of the caudal was the longer, 

 and others with a triangular spot on the pectoral, and that the number 

 of dorsal and anal spines and ra3^s are very variable, giving the fin and 

 scale formula? as follows: D. IV to VII-9 to 11; A. 17 to 20; scales 

 48 to 56-10 or 11. 



In the synonymy of this species he includes A. vomerina^ Perugia. 

 On page 27 of Berg's Enumeracion he describes a new closely related 

 species, from Mar del Plata, under the name Aflur! n ichfJnjs plafens/'s., 

 which differs from the present species principally in the number of 

 scales, which he gives as about 70-15 or 16. This species evidently 

 belongs in our genus Odontesthes and should stand as Odontesthes 

 platensis (Berg). 



35. BASILICHTHYS BONARIENSIS (Cuvier and Valenciennes). 



PEJERREY. 



Atherina bonariensis Cuvier and Valenciennes, Hist. Nat. Poiss., 1835, X, p. 469, 



Rio de la Plata, near Montevideo. 

 AtherinicJdhys bonariensis, Perugia, Ann. Mus. Civ. Stor. Nat! Geneva, 2d ser., 



X (XXX), 1890-91, p. 620 (Laguna Ihera, near Corrientes). — Ber(;, Anal. 



Mus. Nac. Buenos Aires, IV (2d ser., I), 1895, p. 30 (Montevideo; Mal- 



donado; Mar Chiquita) . 



According to Berg this species is rare in salt water, but abounds in 

 the lakes and rivers, attaining a large size. He says that the species 

 is distinguished from the others that he has mentioned (A. vomerina, 

 A. platensis, A. mierolepidotus, A. latielavia, and A. argentine^isis) 

 principally by its smaller eye, which is contained 6 or 7 times in head, 

 and the head about -t in length of the fish. 



In our collection there are specimens from -l to 21.5 inches long. 

 The proportional size of the eye alone is an unreliable character, since 

 it is somewhat in inverse ratio to the size of the fish. 

 Proc. N. M. vol. xxxi — 06 7 



