FISHES OF THE ALABAMA BASIN. 51 



cially the anterior part, is of a bright pale vermillion-red. The caudal 

 fin is chiefly rosy, the tips milk-white. The anal is milky, with a decided 

 flush of rose-color. The ventrals are milky. 



Female specimens are duller, but the black fin-markings and the cau- 

 dal spot are similar in all. In the female of C. calUstia, the dorsal mark- 

 ings are obliterated. 



In the males, in spring, the head and anterior dorsal region are rather 

 sparsely tuberculate. The caudal peduncle and the space below the 

 lateral line as far forward as the ventrals are covered with similar 

 tubercles. 



Teeth 1, 4-4, 1, of the usual type, hooked and sharp-edged. Maxi- 

 mum length 23 inches. C. callistia reaches a length of 4 inches. 



Codoma trichroistia is very abundant in the clear tributaries of the 

 Etowah and Oostanaula. Specimens were taken by Messrs. Jordan and 

 Gilbert in 1876. but the species was at first confounded by us with C. 

 callistia, which it much resembles in coloration. The entirely different 

 mouth will distinguish the two species at once. 



36. Erogala c^rulba Jordan. 



Photogenis cceruleus Jordan (1877), Ann. Lye. Nat. Hist. N. Y. 338. 



This most delicate and graceful fish has thus far been only found in 

 the Oostanaula River and its tributary. Rocky Creek. It prefers clear 

 waters. 



37. Codoma Formosa {Putnam) Jordan. 



The typical specimens of Alburnus formosus Putnam and of Leucisciis 

 hypselopterus Giinther were obtained from near Mobile. The species 

 therefore belongs to the fauna of the Alabama Basin. Giinther's 

 description applies well to '■^Photogenis grandipinnis Jor.", and Alburnus 

 formosus is probably the same. 



The following is an analysis of the characters of the species of the 



subgenus Urogala at present known : — 



Section I. Anal fin elongate, its rays 1, 10, or 1, 11 : teeth 1, 4-4, 1. 



a. Dorsal fin entirely posterior to ventrals, its rays, in males, longer than head, reach- 

 ing nearly to the base of the caudal : body short, much compressed : back 

 elevated; depth 4 in length: head 4^: mouth large, very oblique, the 

 jaws equal : black dorsal blotch very distinct : a distinct black caudal 

 spot: coloration and tubercles unknown: size small; length 2^ in- 

 ches FORMOSA, 1. 



aa. Dorsal fin sligJitly posterior to ventrals, its longest rays, in males, shorter than 

 the head, and not reaching nearly to base of caudal: caudal pedunchj 

 tuberculate : fins with much red : size medium ; length 3i inches. 



