eigenmann: the cheirodontin^e. 77 



Cheirodon micropterus Eigenmann, Proc. U. S. Nat. Mus., Vol. XXXIII, 1907, p. 9 



(Santarem); Reports Princeton Univ. Exped. Patagonia, Vol. Ill, p. 429. 



Range: Abundant in Rio Paranahyba, Rio San Francisco, upper Parana, 

 and Paraguay; rare south of these points, and in Amazons. 



The very large number of specimens recorded below, most of them in excellent 

 condition, together with the specimens recorded by me in the papers quoted above, 

 enables me to revise the synonymy and bibliography of this species. As stated 

 by Eigenmann & Ogle a comparison of one of the types of calliurus with specimens 

 recorded by me as interruptus showed that these specimens belong to the same 

 species. At the same time the opinion was expressed that these specimens were 

 probably distinct from interruplus. The material at hand shows that the Para- 

 guayan specimens are specifically identical with C. piaba, originally recorded from 

 the Rio das Velhas and found abundantly throughout the Rio San Francisco. 



The type of micropterus is poor, but is very probably also a C. piaba. 



Aside from the specimens previously recorded, some of which are again 

 enumerated, I have examined many specimens collected by Mr. J. D. Haseman. 



6821a-b, C. M., two males, largest 33 mm. Aregua, Paraguay. April 8, 1909. 

 Haseman. 



6822a-g, C. M., seven, two males, 33 and 39 mm., two females, 36 and 39 mm. 

 three females, the largest 30 mm.^^ Corumba, Paraguay. April 27, 1909. 

 Haseman. 



6824a-p, C. M., seven males, largest 38 mm.; nine females, largest 38 mm. 

 Puerto Suarez. May 6, 1909. Haseman. 



9984, I. U. M. 933a-b, C. M., ten, largest 42 mm. to base of caudal. Campo 

 Grande. Anisits. 



9997 and 10122, I. U. M.; 926a-b, C. M., sixteen, largest 31 mm. to base of 



caudal. Arroyo Pypucu. Anisits. 

 6825a-h, C. M., nine, largest 35 mm. Asuncion, Paraguay. March 28, 1909. 



Haseman. 

 10289, I. U. M., Colonia Gonzales. Anisits. 

 6826a-b, C. M., two, 2V' and 44 mm. Caceres. May 27, 1909. Haseman. 



9985, I. U. M. 953a-b, C. M., thirteen, largest 40 mm. to base of caudal. 

 Arroyo Trementina. Anisits. 



6908a-f, C. M., six, 15^^-20 mm. Caceres. May 24, 1909. Haseman. 



^^ In these smaller specimens and in the two males, the caudal spot extends further on the caudal than 

 in the two larger females. 



^* The smaller has only one tooth on the maxillary. 



'' In the smallest the color is most profuse and the caudal spot extends to near tip of the middle rays. 



