- :-""'-■. 269 



Unlike this species, however, >!. vittatus has a large spot at the base of each lobe of 

 the caudal fin, as clearly evident in the figure accompanying Steindachner's 

 description (Steindachner 1908; pi. 9), and still observable in the holotype. 

 Although the coloration pattern of ^4. vittatus is extremely variable, especially the 

 degree of mottling and extent of stripes on the body, this species never exhibits the 

 uniformly striped coloration oiA. n. sp. Moreover, yl. vittatus can be distinguished 

 fromy4. n. sp. on the basis of several additional features (see diagnosis). 



Material Examined /; 



Brazil . - Amapi : MZUSP uncat. (MG 27141, 27143-27144, 27147-27149, 

 27151-27153, 27155; 13 males, 119.3-145.8; 1 female, 168.0), Rio Amapd, cachoeira 

 grande, February 1984, M. Goulding. Amazonas : ANSP 131433 (97.0), W of 

 Moura, near junction of Rio Negro and Rio Branco, approximately 1.5°S, 61.8°W, 

 April-June 1967, J. Faughn. MZUSP 6074 (10 males, 105.8-127.9), Rio Preto da 

 Eva, near Manaus, 13 April 1967, EPA. MZUSP 6337 (female), Lago Castro, 

 mouth of Rio Purus, 7-8 November 1967, EPA. MZUSP 9288 (female, 164.5), 

 market in Manaus, 17-19 September 1968, EPA. MZUSP 34360 (male, 127.1), Rio 

 Negro, cataracts at Sao Gabriel, 18 May 1979, M. Goulding. MZUSP 34361 

 (female, 165), Rio Marauid, cataracts at Bicho-a§u, 13 October 1979, M. Goulding. 

 MZUSP 34362 (male, 128.5), confluence of Rio Marauid and Rio Negro, 27 May 

 1979, M. Goulding. MZUSP 34363 (male, 134.1), confluence of Rio Negro and Rio 

 Cuiuni, 3 June 1979, M. Goulding. MZUSP 34364 (male, 125.6), confluence of Rio 

 Marauid and Rio Negro, 27 May 1979. MZUSP 34366 (2 males, 99.8-116.7), 

 counfluence of Rio Urubaxi and Rio Negro, 4 February 1980, M. Goulding. 

 MZUSP 34367 (9 males, 132.9-146.9), cataracts at Sao Gabriel, 1 May 1980, M. 

 Goulding. MZUSP uncat. (3 males, 118.6-131.7), Rio Purus, Santa Luzia, 11 



