American Ciclilid Genus Ciclilosoma. 327 



cheek with G series of scales ; 8 gill-rakers on the lower part 

 of the anterior arch. Scales 30-31 ~^, 2-^ between lateral 

 line and base of anterior rays of soft dorsal. Dorsal XVI 10, 

 the spines subequal from about the sixth to the thirteenth, 

 thence increasing to the last, which is f the length of head ; 

 soft fin, when laid back, extending to middle of caudal. 

 Anal V 8. Pectoral § the length of head or more, not 

 extending to above the anal ; ventral extending to origin of 

 anal or a little beyond. Caudal rounded. Caudal peduncle 

 as long as deep. Olivaceous, each scale with a small dark 

 spot at the base ; obscure traces of dark cross-bars ; a dark 

 spot below the origin of the lateral line and another on the 

 middle of the side ; vertical fins with small dark spots. 

 Rio Ixtla, Mexico. 



1-2. (137 and 143 mm.) co-types Rio Ixtla. Dr. D. S. Jordan, 



of the species. 



"With these 1 have compared several small examples (30- 

 40 ram.), co-types of C. Steindadineri from the Rio Verde, 

 Avhicli appear to me to present all the characters which might 

 be expected in young specimens of C. istlanum. The general 

 form of the body and the number of scales and fin-rays seem 

 to be the same. The larger eye, shorter snout, smaller 

 mouth, less produced soft dorsal and anal fins, &e. are 

 differences due to size. There are several dark cross-bars on 

 the body and an interrupted longitudinal band bearing a dark 

 blotch on the middle of the side. The lower lip has the same 

 structure as in the larger specimens named C. istlanum. I 

 have retained the name C. istlanum until actual comparison 

 of adult fish from the two rivers has been made. 



51. Cichlosoma Bartoni. 



Acnra Bartoni, Bean, Proc. U.S. Nat. Mus. 1892, p. 280, pi. xliv. fig-. 3. 



Cichlasoma Bartoni, Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1898, 

 p. 151o, fig. 587 ; Pellegr. Mem. Soc. Zool. France, xvi. 1903, p. 206 

 (1904) ; Meek, Zool. Pub. Columbian Mus. v. 1904, p. 211, fig. 68. 



^Heros {Cichlasoma) labridens, Pellegr. Bull. Mus. Paris, 1903, p. 122. 



Cichlasoma labridens, Pellegr. Mem. Soc. Zool. France, xvi. 190.3, p. 207, 

 pi. vi. fig. ] (1904). 



Depth of body 2J-25 in the length, length of bead 2f-3. 

 Snout nearly as long as postorbital part of head. Diameter 

 of eye 4^-5^ in the length of head. Depth of praeorbital 

 greater than diameter of eye. INIaxillarv not extending to 

 below the eye; lower jaw projecting; fold of the lower lip 



* In placing Ileros labridens in the sj-uonymy of C. Bartoni, 1 follow 

 Dr. Meek, who has examined a number of specimens. 



