2'o6 Mv. C. T. Regan on the F'ishes of the 



Diameter of eye 4| in the length of head, interorbital width 

 2^. Depth of pra;orbital 1;^ tlie diameter of eye. Maxillary 

 not extending to the vertical from anterior margin of eye ; 

 jaws equal anteriorly or the lower shorter than the upper ; 

 fold of the lower lip continuous or not ; cheek with 6 or 7 

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

 anterior arch. Scales 32-33 JQ* 3 or 3^ between lateral 

 line and base of anterior part of soft dorsal. Dorsal XVI- 

 XYII 12-13, cominencing above axil of pectoral, the spines 

 slightly increasing in length to the last, which is ^ the length 

 of head, the soft fin, when laid back, extending to anterior 

 I of caudal. Anal V 10. Pectoral |-i the length of head, 

 not extending so far as the ventral, which does not reach the 

 origin of anal. Caudal subtruncate. Caudal peduncle a 

 little deeper than long. Olivaceous, with a dark longitu- 

 dinal band along the middle of the side, ending in a blackish 

 spot on the base of the caudal ; a blackish spot above the 

 origin of the band and below the lateral line ; vertical fins 

 with series of dark spots. 

 Guatemala. 



1-2. (175 and 176 mm.) types of Rio Cahabon. O. Salvin, Esq. 



the species. 



28. Cichlosoma irreyiilare. 



Theraps irregularis, Giiuth. Cat. Fish. iv. p. 284 (1862); Jord. & 



Everm. Bull. U.S. Nat. Mas. xlvii. 1898, p. 1540. 

 Keros irregularis, Giintli. Tiaos. Zool. See. vi. 1869, p. 467, pi. Ixxviii. 



fig. 2. 

 Cichlasoma irregulare, Pellegr. M(5m. Soc. Zool. France, xvi. 1908, 



p. 204 (1904). 



Depth of body 3-3^ in the length, length of head 3A-3f . 

 Snout longer than postorbital part of head (in the adult). 

 Diameter of eye 4-5 in the length of head, interorbital 

 width 3-4. Depth of preeorbital 1-1 i the diameter of eye. 

 Maxillary not extending to below the eye ; lower jaw shorter 

 than the upper ; fold of the lower lip not continuous ; cheek 

 with 6 or 7 series of scales; 9-11 gill-rakers on the lower 

 part of anterior arch. Scales 33-36 J^, 3 between lateral 

 line and base of anterior rays of soft dorsal. Dorsal XV- 

 XVII 12-14, commencing behind the axil of pectoral, the 

 spines subequal from about the fifth to the thirteenth, thence 

 usually increasing to the last, which is ^| the length of 

 head ; soft fin, when laid back, not extending to base of 

 caudal. Anal * IV-V 9-10. Pectoral about g the length 

 * 4 anal spines in the type specimen only. 



