42 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY III. 



Compared with P. niveus, P. leucopus has a different form, the dorsal 

 region is less elevated, and the nuchal region less depressed. The mouth 

 is larger, the maxillary extending to nearly opposite the eye, instead of 

 falling short. The eye is larger and the mouth is less inferior in P. leu- 

 copus. The coloration is somewhat different. 



Photogenis leucopus also resembles Codoma eurystoma, but that species 

 has a heavier head, larger eye, stouter body, and different dentition and 

 coloration. 



Genus CODOMA Girard. 

 9. CODOMA EURYSTOMA Jordan. 



Photogenia euryslomus JORDAN (1877), Ann. Lye. Nat. Hist. 356. 



This is the most abundant Cypriuoid in the tributaries of the Chat- 

 tahoochee Itiver. It frequents especially the cold streams, but does not 

 seem to be adverse to mud. In Suwannee Creek, a deep, cold, muddy 

 stream flowing through the woods, this was almost the only species 

 obtaiued. 



Its life-colors are as follows : General color of Luxilus cornutus on body, 

 but the sides with considerable coppery lustre. Dorsal fin with a sharp, 

 black, horizontal bar nbout halt- way up. In young fishes, this bar is 

 red. The fiu above is somewhat milky ; below, it is pale. There is a 

 small, but distinct, round, black, caudal spot. The caudal fin is chiefly 

 of a rather dull ferruginous red. The base of the fin is pale, the tips 

 rather milky. The anal fiu is unmarked. There are gilt liues along the 

 back and sides. A dark humeral bar is usually present, and the upper 

 edge of the pectoral fin is largely black. 



The teeth of this species are usually 1, 4-4, 1, as at first described, 

 but we have found several individuals 1, 4-4, 2. This species resembles 

 somewhat Photogenis leucopus, but it is stouter every way, with deeper 

 body, larger head, and much larger eye. 



10. CODOMA FORMOSA (Putnam) Jordan. 



(Alburnm formosus Putnam, Leudscus hypselopterus Giinther, Photogenis grandipinnis 



Jordan.) 



The typical specimens of P. grandipinnis are supposed to have beer, 

 collected in Flint Kiver. Leudscus hypseloptcrus of Giiuther is doubtless 

 the same species. We follow Giiuther in identifying Alburnus formosus 

 Putnam as the same, although there is little in the very imperfect orig- 

 inal description to warrant it. 



