American Cichlid Oenus Oichlosoma. 333 



of the lower lip continuous ; upper jaw w^tli tlie anterior 

 pair of teeth distinctly diflerentiated as canines ; lower jaw 

 with the 2 or 3 anterior teeth on each side forming similar 

 canines ; cheek with 6 series of scales ; 8-10 gill-rakers on 

 the lower part of anterior arch. Scales 28-31 ^t£i, 2^ or 3 

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

 Dorsal XV-XVII 10-12, the spines subequal from the sixth, 

 or else slightly decreasing from the sixth to the fourteenth 

 and increasing again to the last, which is nearly ^ the length 

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



1 of caudal or beyond. Anal VI 8-9. Pectoral i-| the 

 length of head, extending to above origin of anal or anterior 

 anal spines; ventral extending to origin of anal. Caudal 

 rounded. Caudal peduncle about f as long as deep. OHva- 

 ceous, with 6 or 7 blackish cross-bars ; a blackish ocellated 

 spot on the upper half of the base of caudal ; vertical fins 

 dusky. 



Guatemala; British Honduras ; Yucatan. 



1-4. (121-171 mm.) types Lake Peten. O. Salvin, Esq. 



of the species. 

 5. (92 mm.) Britisli Honduras. Rev. J. Robertson. 



58. Cichlosoma trimaculatum. 



Meros triinaculatus, Giinth. Trans. Zool. Soc. vi. 1869, p. 461, pi. Ixxvi. ; 

 Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1898, p. 1529 ; Pellegr. 

 Mem. Soc. Zool. Frauce, xvi. 1903, p. 239 (1904). 



Depth of body If (adult) -2^ (young) in the length, 

 length of head 2^-3. Snout shorter than postorbital part 

 of head. Diameter of eye 3j-4| in the length of head, 

 interorbital width 2^-3^^. Depth of prseorbital equal to 

 (adult) or ^ (young) the diameter of eye. Maxillary exposed 

 distally, extending to below anterior margin of eye ; prse- 

 maxillary processes extending to above middle of eye or 

 beyond ; lower jaw slightly projecting; upper jaw with the 



2 anterior teeth of the outer series differentiated as a pair of 

 canines; lower jaw with the anterior 2 or 3 teeth on each 

 side the strongest, forming canines ; cheek with 5 or 6 series 

 of scales ; 8 or 9 gill-rakers on the lower part of anterior arch. 

 Scales 30-31 ^, 2| or 3 between lateral line and base of 

 anterior rays of soft dorsal. Dorsal XVI-XVII 11-12, the 

 spines subequal from about the sixth to the fourteenth, 

 thence increasing to the last, which is ^ or nearly i the 

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

 middle (young) or posterior end (adult) of caudal. Anal 

 VI- V 111 8-9. Pectoral |-| the length of head, extending 



