FISHES OF THE SANTEE BASIN. 21 



Cope's original locality, has convinced us'that the spilopterus, the type of 

 the genus Photogenis, does not belong to the group of colored species for 

 which Professor Jordan lately adopted the latter name. The genus Pho- 

 togenis (Jordan) being thus left without a name, that of Erogala has been, 

 suggested (/?, spring-time; yala., inilk, in allusion to the milk-white pig- 

 ment with which the male fishes are ornamented in the nuptial season)- 

 Codoma Grd. differs from Erogala in the form of the head, which is 

 short, blunt, and rounded, as in Pimephales. We do not now think that 

 the two are distinct as genera, and prefer to consider Erogala as a sub- 

 genus of Codoma. 



The type of Erogala is Photogenis stigmaturus Jordan. This submenus 

 is remarkable for its geographical distribution. All of the species thus 

 far known belong to the Southern States, and each of the Southern 

 river-basins probably has from two to four species of the genus; not a 

 single species, so far as known, being common to two different river- 

 basins. 



The distribution of the species of Erogala is as follows : 

 Santee Basin : pyrrhomelas Cope. 

 chloristia J. & B. 

 Savannah Basin : none known. 

 Altamaha Basin : xcenura Jor. 



callisema Jor. 



Chattahoochee Basin : eurystoma Jor. 

 Flint Eiver : formosa Putn. 

 Alabama Basin : callistia Jor. 



trichroistia J. & Gr. 

 ccerulea Jor. 

 stigmatura Jor. 



Farther west their place is taken by the species of Cyprinella having 

 serrated teeth, and farther north by the species of Luxilus, section Pho- 

 togenis, having teeth with developed grinding surfaces. 



The species of Codoma are remarkable for their exquisite coloration, 

 most of them being adorned with bright red in addition to the milky 

 pigment. The black dorsal spot is present in all the species. 



18. COD03IA CHLORISTIA, Sp. UOV. 



Body short and deep, strongly compressed, the form elliptical, 

 resembling that of C. pyrrhomelas, but rather deeper, the depth of adults 

 being. 3 J to 4 in length. Head rather small and pointed, 4J in length. 



