Meek A Collection of Fishes From Tehuantepec. 245 



While this character in some species varies with age, in this species, judg 

 ing from the material examined by me, it is constant, the lower lip being 

 nearly as free as in C. salvini. 



I will mention here that a re-examination of the material at my com 

 mand has convinced me of the identity of Cichlasoma melanurum (Giinther) 

 and Cichlasoma gadowi Regan.* My opinion here is based on my study 

 of a considerable amount of material both in the field and in the laboratory. 

 In all large groups of animals some species are quite variable and others 

 are not. In order to properly define the more variable forms field work is 

 quite necessary. 



Cichlasoma trimaculatum (Giinther). 



Seven individuals were taken at Achotal. The three lateral spots and 

 the very irregular dentition are well shown in these specimens. 



Cichlasoma fenestratum (Giinther). 

 Achotal. 

 I follow Mr. Reagan in the use of this name instead of C. parma. 



Cichlasoma zonatum sp. nov. 



Type from Nil tepee, Oaxaca. Field Columbian Museum. No. 3776. 



Total length, 175 mm. Head, 3 ; depth, 2.11 ; scales, 7-33-12; D. XVIII, 

 6 ; A. VI-8. Body deep, back elevated, profile very convex ; mouth small ; 

 jaws equal ; snout blunt; teeth rather small, pointed, those in front in each 

 jaw slightly the larger; lips thin, lower with well developed frenum ; max 

 illary short, reaching vertical from midway between nostril and eye, its 

 length 4 in head; preorbital 4, postorbital 2.67; distance from inferior 

 margin of the orbit to the horizontal passing through mouth 4.8 in head ; 

 diameter of eye 4.36 in head ; gill rakers short, 3-7; pectoral fin 4 in length 

 of body; ventrals pointed, short, their tips not reaching first anal spine; 

 spinuous dorsal low, the sixth spine 2.81 in head, the last 2.51 ; soft dorsal 

 and anal rays reaching slightly past base of caudal fin ; least depth of caudal 

 peduncle 2.28 in head. Color dark olivaceous, without evident black bars ; 

 a broad black band from opercle to caudal, a few small dark spots above 

 and below this band. 



This species belongs in the same group with C. nebulifer (Giinther) and 

 C. eigenmanni Meek. It is a much deeper fish than either of these, has a 

 lower spinous dorsal, fewer dorsal rays, and different coloration. 



Thorichthys aureus (Giinther). 



Mr. Regan has, no doubt, correctly established the identity of T. aureus 

 (Giinther) and T. helleri (Stein.). 



*1. C. 231. 



