340 Annals of the Carnegie Museum. 



No. 2584, 4.5 cm., Penedo, Rio Sao Francisco, March 22, 1908. 

 No. 25850-^, 4 and 4.5 cm., Santarem, Dec. 9, 1909. 



These specimens have a larger eye, rounder body, ocellated caudal 

 spot, black lines along the rows of scales of sides, no distinct cross-bar, 

 eye greater than the snout and equal to the interorbital space; the 

 vertical fins are well scaled on their basal halves, in contrast to the 

 Penedo specimen, which has a much more slender body, smaller eye, 

 and eight distinct cross-bars on the sides. One of the Santarem speci- 

 mens has five anal spines. I have not described the Penedo specimen 

 as new, because all of the intermediate stages are found in the Rio 

 Sao Francisco. 



No. 2586a-/?, 4 cm., Cidade da Barra, Lagoa Pereira, Dec. 23, 1907. 

 No. 2587, 5 cm., Alagoinhas, Rio Catu, Bahia, March 4, 1908. 

 No. 2588«-rf, 5.5 to 6 cm., Joazeiro, Rio Sao Francisco, Nov. 28, 1907. 

 No. 25890-^, 3.5 to 5 cm.. Propria, Rio Sao Francisco, below the falls, 



March 30, 1908. 



One has only three anal spines and twenty-three scales in the first 

 series below the lateral line. 

 No. 259oa-M7, 2.5 to 6.5 cm., Lagoa Salgado, Rio Salitre, Bahia, Nov. 



10, 1907. 



I cannot distinguish this species from A. portalcgrensis, except 

 for its having as a rule four anal spines. One spine more or less does 

 not always have either generic or specific significance. 



26. C. festivum f Meckel). 



No. 25910-//, 2.5 to 6 cm., Campos Alegre, Rio Jauru, June 2, 1909. 

 No. 2592a-g, 2 to 7 cm., Bastos, Rio Alegre of Guapore, June 26, 1909. 

 No. 25930-5, 4 and 4.5 cm., Santarem, Dec. 9, 1909. 

 No. 25940-^/, 3 to 4.5 cm., Sao Luiz de Caceres, Rio Paraguay, May 



24, 1909. 

 No. 2595fl-c, 2.8 to 5 cm., Sao Antonio de Guapore, July 30-Aug. 10, 



1909. 

 No. 2596, 5 cm., Santarem, Dec. 15, 1909. 

 No. 2597, 7 cm., Manaos, Nov. 29. 1909. 



No. 2598, 4.5 cm., San Joaquin, Bolivia, Sept. 4, 1909, in a lake. 

 No. 25990-^, 2.8 to 4 cm., Sao Luiz de Caceres, Rio Paraguay, May 



23-27, 1909. 



27. C. facetum (Jenyns). (Plate LVIL) 



C. autochthon Giinther, C. oblongum Castelnau. 



The following specimens ha\'e the fold of the lower lip continuous. 



