144 Annals of the Carnegie Museum. 



sci^enid/e. 



91. Pachyurus bonariensis Steindachner. 

 Corumba (250). 



Cichlid^e. 



92. Chcetobranchopsis australe Eigenmann & Ward, sp. nov. (Plate 



XLIV, Fig. 1). 



Type No. 10157, one specimen no mm. to base of caudal. 



Bahia Negra. 



Profile from tip of snout to occipital region straight, thence evenly 

 curved to base of caudal. Depth ifi, head 1^ ; eye 3^ in head, 

 1 in snout, i-J/§ in interorbital. Cleft of mouth oblique, not reach- 

 ing to the vertical from the orbit ; cheek scaled ; upper part of oper- 

 culum scaled ; 14 scales in front of dorsal ; 10 scales in front of ven- 

 trals. Dorsal spines of medium strength, increasing in height pos- 

 teriorly, the highest being 1^ times orbital diameter; pectoral long, 

 some of the rays in the upper half much produced, longer than head, 

 reaching to origin of second half of anal ; ventrals produced in a 

 filament which reaches to 3d anal ray. Anal and caudal fins densely 

 scaled ; soft dorsal with a very few, indistinct scales at base. Color 

 light brown • a dark blotch on cheek and a dark spot on sides below 

 lateral line ; ventral and anal fins margined with black. 



D. XIV, 13; A. V, 16; lat. 1. 19+10; depth, 1^. 



C. orbicularis from the Amazon has fifteen dorsal and six anal spines. 



93. JEquidens tetramerus (Heckel) . Cara. 



Ascuncion ; tributary of Paraguay in Chaco Paraguayo ; Corumba ; 

 Bahia Negra; Puerto Max and Villa Rica (288, 343, 381, 391, 415, 

 468). An examination of 9 specimens gives D. XV, 10 in all speci- 

 mens; A. Ill, 9 in seven; III, 10 in two; lat.l.i6-f 10 in one ; 

 17 -f 8 in three, and 17 + 9 in five specimens. 



94. ALqiiidens paraguayensis Eigenmann & Kennedy (Plate XLIV, 

 Fig. 2). 



Ascuncion; Corumba; Rio Otuquis ; Puerto Max (414, 417, 418, 

 282, 284, 326, 369, 379, 391). 



An examination of 29 specimens gave the formulas ; D. XIII, 10 

 in one specimen; XIV, 9 in 21 ; XIV, 10 in 3 and XV, 9 in 4 

 specimens. A. Ill, 7 in one, III, 8 in 18 and III, 9 in 10; lat. 1. 

 constant, 16 ■+ 10. Of the specimens with A. Ill, 9, six came from a 

 mountain brook at Sapucay (454). 



