242 On the American Cichlid Genus Cichlosoma. 



Depth of body about 2 iu the length, length of head 

 2^-2;^,. Snout shorter than postorbital part of head. 

 Diameter of eye 3^-4 in the length of head. Maxillary not 

 extending to belovr the eye; jaws equal anteriorly; fold of 

 the lower lip continuous or not; cheek with 5 series of 

 scales ; 11 gill-rakers on the lower part of anterior arch. 

 Scales about 30 % Dorsal XIV-XV 12-15, the spines sub- 

 equal from the fifth, the last ^ the length of head ; soft fin, 

 when laid back^ extending beyond the middle of caudal, in 

 the adult. Anal V 8-9. Pectoral |-i the length of head, 

 extending nearly to above origin of anal ; ventral extending 

 to origin of anal or beyond. Caudal subtruncate. Caudal 

 peduncle f-f as long as deep. Olivaceous, with 6 darker 

 cross-bars ; a blackish spot on the upper part of the base of 

 caudal ; fins dusky, the vertical ones sometimes with small 

 dark spots. 



Tehuantepec, Southern Mexico. 



The specimens described by ]\Ieek measure up to 200 mm. 

 iu total length. 



A.S in the closely allied C macr acanthus, and in some 

 other species of the genus, in adult examples many of the 

 teeth of the outer series may be worn and end in a flat 

 circular surface, but this feature is not even of specific, 

 much less of subgeneric, value. 



36. Cichlosoma altifrons. 



Keros altifrons, Kner & Steind. Sitzb. Ak. Bavern, 1863, p. 223, and 

 Abhaudl. Ak. Bajern, x. 1866, p. 11, pi. ii'. tig. 1; Giiutli. Trans. 

 Zool. Soc. vi. 1869, p. 459 ; Jord. & Everni. Bull. U.S. Xat. Mus, 

 xlvii. 1898, p. 1538 ; Pellegr. Mem. Soc. Zool. France, xvi. 1903, 

 p. 228 (1904). 



Depth of body about 2|^ in the length, length of head 

 nearly 3. Snout longer than postorbital part of head. 

 Diameter of eye 4—5 in the length of head and 1| in the 

 interorbital width. Depth of prseorbital greater than 

 diameter of eye. Maxillary not extending to below the eye ; 

 jaws equal anteriorly; cheek with 4 or 5 series of scales; 

 12 gill-rakers on the lower part of anterior arch. Scales 

 about 30 ^g, 2.\ between lateral line and base of anterior rays 

 of soft dorsal. Dorsal XVI 11, the spines increasing in 

 length to the last, which is nearly i the length of head ; 

 soft fin, when laid back, extending to anterior third of 

 caudal. Anal V 8-9. Pectoral | the length of head, ex- 

 tending nearly to above origin of anal ; ventral extending a 

 little beyond origin of anal. Caudal slightly rounded. Caudal 



