American Cichlid Genus Oiclilosoma. 77 



Very similar to Herotilapia multispinosa, but especially 

 distinguished by the absolutely conical teeth. 



11. Cichlosoma immaculatum. 



Cichlasoma spinosissimum, var. immaculatum, PellegT. Mem. Soc. Zool. 

 France, xvi. 1903, p. 225 (1904). 



Very similar to the preceding species. Dorsal XVIIl- 

 XIX 9-10. Anal IX 9. Scales 29 ^^. Cheek with 5 or 6 

 series of scales. 8 gill-rakers on the lower part of anterior 

 arch. Uniformly greyish. 



Rio Polochic. 



Since two specimens agree in these characters, it seems to 

 me best to regard them as belonging to a distinct species. 



12. Cichlosoma centrarchus. 



itrarclms, Gill & Bransford, Proc. Ac. Philad. 1877, p. 185. 

 la centrarchus, Jord. Si, Everm. Bull. U.S. Nat. Mus. xlvii. 



Heros cent 

 Cichlasoma 



1898, p. 1526 ; Pellegr. Mem. Soc. Zool. France, xvi. 1903, p 224 



(1904). 



Depth of body nearly 2 in the length, length of head 3. 

 Snout I as long as postorbital part of head. Diameter of 

 eye 3| in the length of head, interorbital width 2i. Depth 

 of prseorbital g the diameter of eye. Maxillary not ex- 

 tending to below the eye ; praemaxillary processes extending 

 to above the anterior margin of eye; jaws equal anteriorly; 

 fold of the lower lip continuous (? or not) ; cheek with 4 or 

 5 series of scales; 15 gill-rakers on the lower part of the 

 anterior arch. Scales 29 ^, 2 between lateral line and base 

 of anterior rays of soft dorsal. Dorsal XVI (8) 9, com- 

 mencing above the opercular cleft^ the spines subequal from 

 the fifth to the fourteenth, the last more than ^ the length 

 of head. Anal XI 8 (X 9). Pectoral as long as the he^d, 

 extending to above the fifth anal spine; ventral extending 

 to middle of anal. Caudal subtruncate. Caudal peduncle i 

 as long as deep. Olivaceous, Avith 7 or 8 dark brown cross- 

 bars ; a dark spot at the base of caudal ; fins dusky. 



Lake of Nicaragua. 



1. (140 mm.) one of the types L. Nicaragua. Smithsouiau lust, 



of the species. 



[To be continued.] 



