362 Annals of the Carnegie Museum. 



No. 27640-/;, 2.4 to 3.8 cm., Puerto Suarez, Bolivia, May 6, 1909. 



Dark brown with blue spots on the head; a broken lateral band with 

 faint cross-bands; depth 2.33 in the largest specimen; head about 3; 

 last dorsal spine two-fifths to one-half the length of the head; three 

 or four series of scales on the cheeks. 



After a careful study of these specimens I do not hesitate to regard 

 H. pleurotcenia Regan as a synonym of H. horellii Regan. 



65. Heterogramma ritense, sp. nov. (Plate LXX.) 



No. 2765a-rf, Santa Rita, Rio Santa Rita of the Paraguay basin, 



June 12, 1909. 



The type, No. 2765a, is 2.5 cm. long; the cotypes, Nos. 2'j6^b-d, are 

 2 to 2.4 cm. long. 



D. XV, 6; A. III. 6; depth 2.2; head 2.5; eye 3 in head, greater than 

 the length of the snout and the interorbital space; preorbital about 

 one-third the diameter of the eye; three rows of scales on the cheeks; 

 three gill-rakers on the lobe and two on the lower branch of the first 

 gill-arch; upper lateral line with seven to nine pores, the lower branch 

 wanting; preoperculum scaleless; maxillaries extending to the front 

 margins of the eyes; scales 2.5-21-7 (21 in a median lateral series); 

 caudal peduncle half as long as deep; pectorals about as long as the 

 head; seven more or less distinct cross-bands, but no lateral band; 

 small caudal spot; faint band from the eyes to the mouth; bars beneath 

 the eyes continued above the eyes on the top of the head; fins, ex- 

 cepting the base of the dorsal, which is black, colorless; dorsal spines 

 about subequal from the fourth, which is one-half the length of the 

 head. 



The coloration, shorter and deeper body, fewer scales, gill-rakers, 

 and shorter caudal peduncle separate this species from its nearest 

 ally, H. horellii. 



Genus Geophagus Heckel. 



66. Geophagus surinamensis Bloch. 



No. 2815, 6.3 cm., Santarem, Rio Tapajos, Dec. 6, 1909. 



Nineteen dorsal spines, the fifth of which is more than one-half the 

 length of the head. 



No. 2817, 7 cm., Belem, Para, Dec, 1909. 

 No. 28l8a-5, II cm., Sao Antonio, Rio Guapore, Aug. 10, 1909. 



21 

 D. XVII, II ; A. II, 7; scales 8-34-11 ; pores - ; depth 2.5; head 3.25; 



13 

 fifteen gill-rakers on lower anterior arch; caudal peduncle one and 



