214 



FIELD COLUMBIAN MUSEUM ZOOLOGY, VOL. V. 



evidence of approximate spawning time. This species and the large 

 catfish found in the Balsas Basin are the most important food fishes 

 of that region. 



201. Cichlasoma evermanni sp. nov. 



Type, No. 4227, F. C. M., 5.25 inches in length; Tehuantepec, 

 Oaxaca. (Tehuantepec.) 



Rio Tehuantepec. (Tehuantepec.) 



FIG. 70. CICHLASOMA EVERMANNI Meek. 



Head 2^; depth 2%; D. xiv or xv, 13 to 15; A. v, 8 or 9; scales 

 7-32-12. Body deep, compressed; the profile rather steep, its an- 

 terior half slightly concave, the posterior half convex; mouth rather 

 large, the maxillary 3,^ in head, its tip not quite reaching vertical 

 from anterior margin of the eye; jaws equal; teeth in each jaw in a 

 band, the anterior row slightly enlarged; lips moderately thick, the 

 lower with no distinct frenum, though not quite so free at the sym- 

 phisis as laterally; preorbital broad, 3% in head; postorbital 2^; 

 interorbital 2 ^ ; diameter of eye 3 ^ to 4 in head, ; cheeks with 5 rows 

 of scales; origin of dorsal to tip of snout 2^3 in the body; dorsal 

 spines gradually increasing in size to about fifth, longest (eighth) 3 in 

 head; in the largest specimens (5 inches in length) the middle rays of 

 the dorsal are produced, their tips reaching past the middle of the 

 caudal fin; in smallest specimens (4 inches in length) tips of dorsal 

 and anal rays reach slightly past base of anal; pectoral fin i in 

 head ; ventral with the tips produced in the larger individuals ; tips in 

 the young scarcely reaching base of first anal spine, in adults to fourth 

 anal spine; caudal fin truncate; caudal peduncle deep, its least 

 depth 2 in head, its length i^ in its least depth. 



