American Cichlid Genus Ciclilosoma. 231 



Scales 33 ~^, 3}, between lateral line and base of anterior 

 part of soft dorsal. Dorsal XVIII 11^ commencing above 

 the extremity of operculum, the spines slightly increasing in 

 length to the last, which is a little more than | the length of 

 head ; soft fin, when laid back, extending to anterior ^ of 

 caudal. Anal VI 9. Pectoral | the length of head, not 

 extending to above the vent ; ventrals extending to the 

 vent. Caudal subtruncate. Caudal peduncle | as long as 

 deep. Olivaceous, w^ith small dark spots ; 6 dark cross-bars 

 on the side, and a dark longitudinal band from operculum to 

 base of caudal. 



Guapote, Mexico. 

 1. (223 mm.) type of the species. Guapote. Mexico Mus. 



21. Cichlosoma melanurum. 



Heros melamirus, Giintli, Cat. Fish. iv. p. 288 (18G2), and Trans. Zool. 



Soc. vi. 1869, p. 4oO, pi. Ixxii. %. 3. 

 Heros melanopoyon, Steind. Denkschr. Ak. Wien, xxiii. 1804, p. 72, 



pi. i. fig. 3. 

 Cichlasoma melanopogon, Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 



1898, p. 1523. 

 Cichlasoma 7nelanuruni, Jord. & Everm. I. c. ; Pellegr. Mem. Soc. Zool. 



France, xvi. 1903, p. 212 (1904). 



Depth of body 21-2? in the length, length of head 3-3~j-. 

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

 3-5 in the length of head, interorbital width 2|-3. Depth 

 of prseorbital f-l-^ the diameter of eye. Maxillary not 

 extending to below the eye; jaws equal anteriorly; fold of 

 the lower lip subcontinuous or not continuous ; cheek with 

 5 or 6 series of scales ; 7 or 8 gill-rakers on the lower part 

 of anterior arch. Scales 31-34 j|— , 3 between lateral line 

 and base of anterior rays of soft dorsal. Dorsal (XVI) 

 XVII-XVIII 11 (12), commencing above the opercular 

 cleft, the spines subequal from about the sixth to the tenth, 

 thence sometimes slightly decieasing to the fourteenth or 

 fifteenth and increasing again to the last, which is i-\ the 

 length of head; soft fin, when laid back, extending a little 

 beyond base of caudal. Anal V-VI 8-9. Pectoral about I 

 the length of head, extending about to above the vent ; 

 ventral extending to origin of anal. Caudal subtruncate. 

 Caudal peduncle |— | as long as deep. Olivaceous, with 

 2 series of blackish spots which may unite to form con- 

 tinuous longitudinal bands, the first below the spinous dorsal 

 ami above the lateral line, the second from the middle of 

 the side to the base of caudal ; vertical fins dusky. 



Guatemala; Southern Mexico. 

 1-5. (85-260 mm.) types of the species. Lake Peten. O. Salvin, Esq. 



