444 On the Ameiican CichUd Geniis Ciclilosoma^ c&c. 



spots on the cheeks hlue, often surrounded by a dark ring ; 

 in the latter the corresponding spots are blackish, many of 

 them with a blue centre. In all other respects these two 

 supposed species are absolutely identical. 



Cichlosoma istlanum (p. 326'' . 



S'everal yonng specimens differ in coloration from examples 

 of C. Steindachneri of the same size. They have 7 or 8 dark 

 cross-bars, a dark spot below the origin of the lateral line, 

 another on the middle of the side, and a third at the base of 

 the caudal. 



After the description of C. istlanum should be inserted : — 



Cicldosoma Steindachneri. 



Cichlasoma Stehidachneri, Jord. & Snyder, Bull. U.S. Fish. Coram, xix. 



1899, p. 14.3, fijr. 20; Jord. & EveVni. Bull. U.S. Nat. Mus. xlvii. 



1900, p. 3173; Pellegr. Mem. Soc. Zool. France, xvi. 1903, p. 20t3 

 (1904) ; Meek, Zool. Pub. Columbian Mus. v. 1904, p. 211, tig. 67. 



Cichlosoma istlanum (part.), Regan, supra, p. 326. 



Depth of body 2iin the length, length of head 2*. Snout 

 as long as postorbital part of head. Diameter of eye 4 in 

 the length of head and equal to the interorbital width. 

 Depth of prseorbital equal to diameter of eye. Maxillary 

 slightly exposed, extending to between nostril and eye ; 

 prgemaxillary processes extending to above anterior margin 

 of eye or slightly beyond; jaws equal anteriorly; fold of 

 the lower lip subcontinuons ; upper jaw with the two ante- 

 rior teeth of the outer series the largest, forming canines ; 

 lower jaw with 3 pairs of canines, the anterior pair the 

 smallest ; cheek Avith 6 series of scales ; 8 gill-rakers on the 

 lower part of the anterior arch. Scales 31 ||, 2^ between 

 lateral line and base of anterior rays of soft dorsal. Dorsal 

 XVI 10, the spines subequal from the sixth to the fourteenth, 

 thence increasing to the last, which is a little more than I 

 the length of head ; soft fin, when laid back, extending to 

 antei'ior I of caudal. Anal V 8. Pectoral | the length of 

 head, extending to above the vent ; ventral extending to the 

 vent. Caudal subtruncate. Caudal peduncle nearly as 

 long as deep. Olivaceous; sides witli about 10 narrow 

 vertical dark bars ; a series of dark blotches forming an inter- 

 rupted longitudinal band from operculum to base of caudal ; 

 sides of head and lower part of body with small dark spots ; 



