366 Annals of the Carnegie Museum. 



No. 2798, 6.5 cm., Uruguayana, Rio Uruguay, 1909. 



No. 27990-6, 2.8-5.4 cm., Corumba, Rio Paraguay, April 27, 1909. 



The smallest specimen has a caudal peduncle as long as deep* 

 depth 2-2.4 in length of body. 



No. 2800, 7.5 cm., Corumba, Rio Paraguay, April 28, 1909. 

 No. 28oia-e, 7.8-12.2 cm., Sao Luiz de Caceres, Upper Rio Paraguay, 



May 27, 1909. 



22 

 D. XIII or XIV, 13; A. Ill, 9; pores ; depth 1.8; head 2.8; 



eye 4 in head; snout 1.67 in head; some have the fold of the lip inter- 

 rupted, and some have soft dorsal not scaly, and some are fairly well 

 scaled at their base. 

 No. 2802a-e, 3-5 cm., Puerto Suarez, Bolivia (Steinbach Collection). 



Depth 2.33; head 2.8; snout 3 in the head; eye 2.5; interorbital 

 space 3.5; preorbital 4; caudal peduncle about as long as deep, soft 

 dorsal ranging from scaleless to fairly well scaled. 



The young of this species appear to be difTerent from the adults, 

 which also have the soft dorsal ranging from scaleless to scaled (in 

 one case some of the membranes between the last dorsal spines are 

 scaly) ; some have spotted vertical fins and others do not, and some 

 have the fold of the lower lip interrupted, while others are continuous. 

 In view of all this the genus Satanoperca does not appear to be tenable. 

 71. Geophagus brachyurus Cope. 

 No. 28710-6, 5-6 cm., Uruguayana, Rio Uruguay, Feb. 7, 1909. 



D. XII to XIV, 9 to 10; depth about 2.33; head 3; eye 3.5 to 4 

 in head, a little more than the preorbital and a little less than the inter- 

 orbital width; scales 4-24 to 27-8 or 9 (counted in a median lateral 

 series); eight gill-rakers on lower anterior arch; three or four rows of 

 scales on the cheek; caudal peduncle about as long as deep; nares half- 

 way between tip of the snout and the eyes; sides with about six double 

 bands, the third having a dark spot; band below eyes meeting on 

 top of head; vertical fins more or less white-spotted, some specimens 

 with white bands on the spinous dorsal. One has a pectoral fin 

 which reaches almost to the base of the caudal; at least the outer 

 halves of the ventrals dark blue; some with brown pigment at the 

 bases of the scales along the sides; two series of scales between the 

 lateral line and first dorsal rays. 

 No. 28i2a-e, 1-4 cm., Cacequy, Rio Grande do Sul, Feb. i, 1909. 



The very pointed snout is four-fifths the length of head; vertical fins 



