Haseman : Expedition to Central South America. 367 



almost colorless; one scale between lateral line and first dorsal rays. 

 No. 28130-6, 2.5-4 ^"'"•. Cachoeira. Rio Grande do Siil, Jan. 26, 



1909. 

 No. 2814, 7 cm., Porto Alcprc, Rio Grande do Sul, Jan. 21, 1909. 



D. XIV, 9; A. Ill, 8; depth 2; eye almost 4; prcorbital about ecjiial 

 to interorbital and 4 in head; fold of lower lip not continuous; maxil- 

 laries not extending to the eye; eight to ten gill-rakers on the lower 

 anterior arch; scales 5-24-10 (counted in a median lateral series); 

 caudal peduncle .75 as long as deep; seven rows of scales on cheek; 

 one scale between lateral line and first dorsal ra>'s; caudal emarginate; 

 pectorals extending beyond the origin of anal; bar through the eye and 

 rather obscure cross-bars with a lateral spot; blue lines between the 

 cheeks and preoperculum and some blue spots on the cheeks, and the 

 operculum; fins blue-black, especially the dorsal and ventrals, without 

 spots; some faint bars on the dorsal; each scale with dark brown, which 

 appears as broken lateral bands. Most of my specimens do not have 

 pearly spots on the sides. 



Geophagus brachyiirus is very similar to G. hrasiliensis, changing 

 into the longer form, G. gymnogenys, on the one hand, and into G. 

 halzanii, the rounder one. on the other. The extremes are quite dis- 

 tinct, but when one has all of the intermediate stages he could con- 

 sider the three species identical. I have left them separate for con- 

 venience in speaking of the local variations. 



Geophagus aiistrale Eigenmann (1907) is identical with the smaller 

 specimens of G. brachyiirus except for the lateral spot, which is often 

 lost with age. 



72. Geophagus cupido Meckel. 

 No. 2822a~d, 6.4-1 1 cm., Sao Antonio de Guapore, Rio Guapore, 



Aug. 10, 1910. 



Snout 2.25; D. XVI, 10 and 11 ; three specimens have the fold of 

 the lower lip interrupted, and one has it continuous; eye equal to the 

 prcorbital and the interorbital space. 

 No. 2823 a-b, 4.3 cm., Sao Antonio de Guapore, Rio Guapore, July 26, 



1909. 



The dorsal spine membranes are black-edged; the interorbital space 

 is less than the diameter of the eye. 

 No. 2824, 6.5 cm., Sao Antonio de Guapore, Rio Guapore, July 31, 



1909. 

 No. 2825, 5 cm., Santarem, Dec. 6, 1909. 



