1903.] NATURAL SCIENCES OF PHILADELPHIA. 535 



produced, filamentous. Dorsal spines of nearly miiform height, equal 

 to f the length of the head. Outermost ray of the ventrals produced, 

 reaching to the end of the base of the anal. Pectorals reaching beyond 

 origin of anal. 



A series of faint cross-bars on the sides, a black band from the upper 

 part of the eye to near the end of the spinous dorsal, much narrower 

 on the head than on the body. A large black spot in the lateral band 

 near the middle of the body. A dark band down and slightly back from 

 the eye; a dark band across forehead. A black spot on upper haK of 

 base of caudal. 



Other specimens differ from the type in some respects. Among all 

 the specimens examined but one had XIII ; one had XV instead of XIV 

 dorsal spines; a few had 10 rays in the dorsal. The anal rays varied 

 from 6-8. The tubes of the lateral line varied from 14-17 on the ante- 

 rior limb and from 6-10 on the posterior. 



The color varies much in intensity and the median lateral spot and 

 bar down from eye are more conspicuous in the young than in the 

 adult, while the lateral band is much less conspicuous in the young. 



103. Mesonauta festivus (Heckel). 



Two specimens (182), from a Laguna near Arroyo Trementina. 



104. Crenicichla lepidota Heckel. 



Seven specimens, Rio Branco, Matto Grosso (105); Campo Grande 

 (156 and 157) ; Laguna near Arroyo Trementina (188) ; Arroyo Chaga- 

 lahna (224); Arroyo Trementina (249). 

 106. CrenicicMa saxatilis (Linn.). 



One specimen (10), Laguna of Rio Paraguay. 



106. Geophagus duodecimspinosum Boulenger. Pira mbocaya. 



Eight specimens (3, 67, 76, 141), from the Laguna at Asuncion. 

 There can be no doubt aljout the identification of the specimens before 

 us with Boulenger's species, although none of them agree with the type 

 in the number of spines. Boulenger givos D. XII, 14; A. Ill, 9; lat. 

 line 18 + 9. Our specimens have the rays and scales as follows : 



D. 13-14 A. Ill, 8 Lat. 1. r. 20+12 



D. 14-13 A. Ill, 9 Lat. 1. r. 20+12 



D. 13-13 A. Ill, 8 Lat. l.r. 21 + 11 



D. 13-13 A. Ill, 9 Lat. 1. r. 18+ 9 



D. 13-15 A. Ill, 9 Lat. l.r. 21 + 11 



D. 14-13 A. IV, 8 Lat. 1. r. 20+11 



D. 13-13 A. Ill, 7 Lat. l.r. 19+9 



D. 14-12 A. Ill, 8 Lat. l.r. 21+ 8 



The lateral line is interrupted at the caudal, being continued along 



