126 FIELD COLUMBIAN MUSEUM ZOOLOGY, VOL. VII. 



drawn from 1 meeting of jaws to base of last anal ray passes across 

 upper third of base of pectoral; to middle of base of caudal passing 

 nearly midway between eye and base of pectoral. 



Color light olivaceous, sides with 7 dark bars; a black blotch on 

 fourth bar under lateral line; a black spot on upper half of base of 

 caudal; soft dorsal, anal and caudal fins, usually with small, dark 

 spots; ventral dusky; middle of each scale lighter than the rest, 

 giving more or less distinct lines along the rows of scales. The lateral 

 and caudal spots as distinct on large as on small individuals. 



Managua (19), 130 to 240 mm.; Granada (4), 125 to 135 mm. 



Archocentrus. 



Cichlasoma centrarchus (Gill & Bransford). 



Heros centrarchus Gill & Bransford, Proc. Acad. Nat. Sci., Phila., 

 1877, 185, Lake Nicaragua. 



Head 2.6 to 2.8; depth 1.9 to 2.1; D. xv or xvi, 8 or 9; A. ix 

 or x, 7 to 9; scales 6-2811. Body deep, compressed; profile nearly 

 evenly convex; mouth small, little oblique; fold of the lower lip 

 continuous; snout 3.0 to 3.5 in head; maxillary 3.2 to 3.6; mandible 

 2.4 to 2.6; preorbital 6.0 to 7.0; postorbital 2.1 to 2.3; interorbital 

 2.4 to 2.5; diameter of eye 3.4 to 3/6; eye to subopercle 2.8 to 3.2; 

 gill rakers 8+17; dorsal spines rather light, last dorsal spine 2.0 

 to 2.3 in head; last anal spine 2.0 to 2.2; origin of dorsal fin to snout 

 2.1 to 2.4 in body; base of anal 2.3 to 2.6; caudal peduncle short, 

 its length 3.6 to 4.4 in head, its depth 2.1 to 2.3 ; soft dorsal and anal 

 scaly at base on interradial membranes; caudal fin rounded, its 

 middle rays slightly emarginate. 



Color olivaceous; sides with 7 dark vertical bars; a dark caudal 

 spot; opercle with one or two black blotches; pectorals light; other 

 fins dark or dusky, without spots. 



Very abundant in sluggish water. Largest specimen taken 1 50 mm. 



Momotomba (3), 90 to 100 mm.; San Francisco (i), 95 mm.; 

 Jenicero (66), 27 to 150 mm.; Cisplaya (18), 45 to 120 mm. 



Thorichthys. 



Cichlasoma rostratum (Gill & Bransford). 



Heros rostratus Gill & Bransford, Proc.' Acad. Nat. Sci., Phila., 

 1877, 181, Lake Nicaragua. 



