130 FIELD COLUMBIAN MUSEUM ZOOLOGY, VOL. VII. 



Color light olivaceous, a dark band from eye to base of caudal 

 ending in a black caudal spot. The few dark blotches at base of 

 dorsal indicate the possible presence of vertical bars in the young; 

 vertical fins unspotted. 



Three specimens, all males, from Lake Nicaragua near Granada. 

 Length 154, 155 and 160 mm. respectively. One 97 mm. from Lake 

 Managua at Momotomba. So far as I can determine, all specimens 

 listed under the preceding species are females. It is very probable 

 that these two species should be united, C. nicaraguense being based 

 on females, C. balteatum on the males of the same species. The 

 material examined by me is only sufficient to suggest this change, but 

 hardly sufficient to warrant my making it. 



Managua (6), 90 to 115 mm.; Granada (3), 155 to 165 mm. 



Genus Neetroplus Giinther. 

 Anterior teeth in each jaw truncate, incisor-like. 



Neetroplus nematopsis (Giinther). 



Neetroplus nicaraguensis Gill & Bransford, Proc. Acad. Nat. Sci., 

 Phila., 1877, Nicaragua. 



Head 3.0 to 3.3; depth 2.3 to 2.4; D. xvin or xix, 9 or 10; 

 A. vi or vii, 7 or 8; scales 7-3311. Body elongate, compressed; 

 profile steep; mouth small, nearly horizontal, the snout prominent, 

 overhanging the lower jaw; lower lip with a frenum; snout 2.1 in 

 head; maxillary 2.7 to 3.7; mandible 2.6 to 3.0; preorbital 3.3 to 

 3.7; postorbital 2.5 to 3.0; interorbital 2.1 to 2.4; diameter of eye 

 2.7 to 3.2; eye to subopercle 2.0 to 2.3; last dorsal spine 1.9 to 2.1; 

 last anal spine 1.7 to 1.9; origin of dorsal to tip of snout 2.4 to 2.9 

 in body; base of anal 3.8 to 4.1 ; pectoral fin short, i.i to 1.3 in head; 

 ventrals 8 or 9; gill rakers 2 +8; caudal peduncle long, its length 2.4 

 to 2.5 in head, its depth 2.1 to 2.3; caudal fin subtruncate. 



Color dark olivaceous ; a dark bar downward and backward from 

 base of gth and loth dorsal spines; fins all plain. 



Momotomba (i), 97 mm.; Managua (33), 45 to 135 mm. 



Genus Herotilpia Pellegrin. 



Anterior teeth in each jaw incisor-like, tricuspid; occasionally 

 a few of the anterior teeth of outer series truncate or slightly trilobed. 



