230 Mr. C. T. Regan on the Fishes of the 



1-9. (60-176 mm.) types Lake Amatitlan. O. Sulvin, Esq. 

 of the species. 



10. (150 mm.) Nr. Pacific Coast of O. Salvin, Esq. 



C. America. 



11-19, 20-25. (62-221 ram.) Lake Nacasil. O. Salvin, Esq. 



26. (211 mm.) Rio de Sarabia. Dr. A. 0. Buller. 



19. Cichfosoma microphthalmus. 



Heros viicrophthalmm, Giintli. Cat. Fish. iv. p. 295 flS62), and Tran^. 

 Zool. Soc. vi. 18(59, p. 464; Jord. & Everm. Bull. U.S. Nat. iSliis. 

 xlvii. 1898, p. 1536; Pellegr. M^m. Soc. Zool. France, xvi. 190-i, 

 p. 232 (1904). 



Depth of body 21-2.} in the length, length of head 3i-3?. 

 Snout nearly as long as postorbital part of head. Diameter 

 of eye 4^-5^ in the length o£ head, interorbital width 2?— 2f. 

 Depth of prceorbital l^-lf the diameter of eye. Maxillary 

 extending to the vertical from anterior margin of eye; jaws 

 equal anteriorly ; fold of the lower lip continuous ; cheek 

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

 part of the anterior arch. Scales 32-34 ^^^^, 3| or 4 between 

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

 XVIII 11-13, commencing above the axil of pectoral, the 

 spines subequal from the seventh to the fourteenth, which 

 are X the length of head, thence increasing to the last, which 

 is more than i the length of head ; the soft fin, when laid 

 back, extending to anterior part or middle of caudal. Anal 

 V-VI^ 9-11. Pectoral | the length of head, not extending 

 so far as the ventral, which does not reach the origin of anal. 

 Caudal subtruncate. Caudal peduncle |-^ as long as deep. 

 Brownish, usually with 4 or 5 irregular dark cross-bars ; a 

 dark spot on the base of caudal ; vertical fin with series of 

 dark spots or dark undulating lines. 



R. Motagua, Guatemala. 



1-3, 4-5. (165-195 mm.) types of the R. Motagua. O. Salvin, Esq. 

 species. 



20. Cichlosoma sexf as datum, sp. n. 



Depth of body 2^ in the length, length of head 3?. Snout 

 as long as postorbital part of head. Diameter of eye 5.\ in 

 the length of head, interorbital width 2/^. Depth of prae- 

 orbital 1^^ the diameter of eye. Maxillary extending to 

 between nostril and eye ; jaws equal anteriorly ; fold of the 

 lower lip not continuous ; cheek with 6 series of scales ; 

 7 or 8 gill-rakers on the lower part of the anterior arch. 



* One specimen only has 5 anal spines. 



