COLLECTION OF FISHES FROM BUENOS AIRES 455 



of the scales of the back frequently very dark brown ; side with 

 about 6 cross-bands, each of those on middle of side composed 

 of double dark lines with a band of light of equal width between 

 them ; no dark spot on side ; pectoral light ; ventrals blue- 

 black ; dorsal dusky, with ascending light stripes which are 

 largely replaced by light spots on the soft dorsal ; caudal dusky, 

 with round hyaline spots on the rays similar to those on soft 

 dorsal ; anal with similar but smaller and less distinct spots ; no 

 spot or ocellus on the caudal. 



Type in Mus. Princeton Univ., a specimen 155 mm. long, 

 from Buenos Aires ; coll. Prof. W. B. Scott. Cotypes in 

 Princeton and Indiana Universities (no. 11352, Mus. Ind. 

 Univ.), 6 specimens 100 to 150 mm. long, from same locality. 



Batrachops scottii Eigenmann, new species. (Plate XXIII, 

 Fig. 8). 



? Crenicichla semifasciata Pellegrin (not Heckel) Cichlides, 

 339, 1904 (Buenos Aires; Montevideo). 



This species is closely related to semifasciata of Heckel, from 



which it differs conspicuously in color. B. semifasciatus was 



described from specimens collected in the Paraguay River 



at Caigara in Matto Grosso. No other specimens have been 



found unless those recorded by Pellegrin belong to semifasciatus. 



The two species may be distinguished as follows : 



a. D. xxii, 10; A. in, 7 ; lateral line 25+ 12; scales 56 or 57; 



greatest thickness 1.25 in greatest height which is 5 in the 



total length ; depth of caudal peduncle equals five eights of 



the greatest depth ; eye 1.5 diameters behind tip of lower jaw, 



5.5 in head ; suborbital one third the diameter of eye ; peroper- 



cular margin turned forward ; a dark band from eye to opercle, 



7 or S dark lines from base of dorsal to middle of side, darkest 



below lateral line and fading out below; a dark ocellus on 



base of caudal ; each scale of the side yellow, with a dark 



brown margin ; fins without spots, semifasciatus. 



aa. D. xxi or xxn, 13; A. in, S or 9; lateral line 25 + 14; scales 

 57; head 3.4 to 3.5 ; depth 4 to 4.5; greatest thickness 1.5 

 in greatest depth ; depth of caudal peduncle 2 in greatest 

 depth; eye 2.5 diameters behind tip of lower jaw, 5.5 to 7 

 in the head ; preorbital 1 (in adult) to 2 (in youngest) in 

 the eye ; peropercular margin slanting obliquely backward ; 

 Proc. Wash. Acad. Sci., March, 1907. 



