244 Meek A Collection of Fishes From Tehuantepec . 



JBelonesox belizanus Kner. 

 San Geronimo. 



Anableps dovii Gill. 

 San Geronimo. 



Heterandria pleurosilus (Giinther). 

 San Geronimo. 



Heterandria lutzi Meek. 

 Achotal. 



Poecilia sphenops Cuvier & Valenciennes. 

 Achotal and San Geronimo. 



Xiphophorus helleri Heckel. 



Achotal. 



Cichlasoma salvini (Giinther). 



Achotal. 



Cichlasoma mojarra Meek. 



Niltepec. 



This species was based on a small specimen from San Geronimo, Oaxaca. 

 In the collection are eight specimens which vary in length from 140 mm. 

 to 300 mm. This species differs from C. salvini (Giinther), which it most 

 resembles, in having a steeper profile, subequal jaws, a less pointed snout, 

 and a less compressed and more robust body. The color markings of the 

 two species are very different. In C. salvini there is a broad, lateral band 

 which is sometimes broken into blotches. In C. mojarra there is no trace 

 of a lateral band, and the vertical bars are very indistinct. There is a 

 dark blotch above the origin of the lateral line, one on the middle of the 

 side just below the lateral line, and one on the upper half of the base of the 

 caudal fin. These blotches are very prominent and constant. The center 

 of each scale on the adults is lighter, these forming more or less prominent 

 stripes along the rows of scales. 



After carefully comparing a number of specimens of C. salvini with C. 

 mojarra I am unable to agree with Mr. Regan* that the two species are 

 the same. 



Cichlasoma evermanni Meek. 



Niltepec. 



In the collection are five specimens of this species ranging in length 

 from 147 mm. to 200 mm. In all of these the teeth are small, conical and 

 pointed. There is no frenum, but the free portion of the lip is not quite so 

 free at the symphysis as laterally. Apparently from the descriptions only 

 Mr. Reagan f identifies this species with Cichlasoma heterodontum (Vail and 

 Pell). This last named species is described as having a very irregular den 

 tition, sufficiently so to suggest its specific name. While it is true that the 

 teeth of older individuals of some species become more or less worn, it is 

 not necessarily true of all in the genus. In this particular instance the 

 specimen described by Vaillant and Pellegrin does not appear to be an old 

 individual, being smaller than the average size of the ten specimens of C. 

 evermanni before me. C. heterodontum is described as having a frenum. 



*Ann. and Mag. Nat. Hist. p. 334, 1905. fl. c. p. 241. 



