Ajne7-ican Cichlid Oenus Cichlosoma. 331 



the base of the last 2 spines and the first soft ray, the third 

 on the posterior soft rays ; vertical fins with light spots. 

 N.W. Ecuador. 



1-3. (118-300 mm.) types of the Eio Durango. Mr. Rosenberg, 

 species. 

 4. (119 mm.) St. Javier. Mr. Rosenberg. 



In the adult examples the teeth are obtuse, many ending 

 in a flat circular surface. On dissection the stomach was 

 found to be full of broken shells. 



These specimens had been referred by Boulenger to 

 C. Festa, but they differ considerably from that species in 

 coloration and in the more slender caudal peduncle- More- 

 over, in C. Festce, when the mouth is closed, the anterior 

 canines of the upper jaw fit in between the anterior teeth of 

 the lower jaw ; in C. ornatuni, on the contrary, the anterior 

 teeth of the upper jaw are external to those of the lower 

 when the mouth is closed, this being especially marked in 

 the adult fish. In C Festce the occipital region is more 

 elevated and convex, and this difference is due neither to 

 age, sex, nor method of preservation, for the largest specimen 

 of C. ornatum is a male, and in both cases the occipital crest 

 can be felt just beneath the skin. Young examples of 

 C. ornaium (118 to 119 mm. in total length) resemble the 

 adult of C. Fest(£ in so far as they have a deeper body 

 and longer dorsal spines than have the adult specimens of 

 their own species, but the differences between adult examples 

 of the two species will be evident from the following 

 measurements : — 



C. Festce (d)- C- ornatum {(S). 



mm. mm. 



Leugth to base of caudal 205 245 



Depth of body 86 86 



Length of head 76 87 



Length of caudal peduncle 22 30 



Deptli of caudal peduncle 30 30 



Last dorsal spine 28 25 



56. Cichlosoma oclofasciatum. 



Heros octofusciatus, Regan, Revue Suisse Zool. xi. 1903, p. 417, 

 pi. xiii. tig. 1 ; Ann. & Mag. Xat. Hist. (7) xiii. 1904, p. 2-58. 



Cichlasoma octofasciatum, Pellegr. Mem. Soc. Zool. France, xvi. 1903, 

 p. 223 (1904) ; Meek, Zool. Pub. Columbian Miis. v. 1904, p. 218. 



Cichlasoma Hedricki, Meek. t. c. p. 208, fig. 66. 



Depth of body 2-2f in the length, length of head 2|-3. 

 Snout shorter than postorbital part of head. Diameter of 

 eye 3-4^ in the length of head, interorbital width about 3. 



22* 



