30 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY III. 



The second peculiarity of the Tugaloo fauna is that its characteristic 

 fishes are all of types abundant in the Tennessee River, but not known 

 from any other of the Atlantic streams. Of these may be mentioned 

 Photogenic gttlacturus, Luxilus coccogenis, Hydroplilox rubricrocevs, and 

 Catostomus nigricans. The close proximity of the sources of the Tugaloo 

 and the Little Tennessee, War Woman Creek and Little Tennessee River 

 rising on opposite sides of Rabun Gap, and of the Tallulah and the 

 Hiawassee, may perhaps help to explain this anomaly of distribution. 



ETHEOSTOMATIDJE. 



Genus HADROPTERUS Agassis. 

 1. DADROPTERUS NiaROFAsciAxus Ag. 



A single large specimen was taken in Toccoa Creek, near Toccoa 

 Falls. 



CENTKARCHID^]. 



Genus MICROPTERUS Lacepede. 

 2. MICROPTERUS SALMOIDES (Lac.) Gill. 



(Var. salmoides.) 



The small-mouthed Black Bass or "Trout 7 ' of the Southern streams 

 (i. c., Savannah, Altamaha, Chattahoochee, Alabama) differs so con- 

 stantly from Northern representatives of the same species that the two 

 forms may be taken as geographical varieties of one species, and it is 

 probably worth while to distinguish each by name. The Labrus salmoi- 

 des of Lacepede was collected by Bosc near Charleston, S. C. It was 

 therefore presumably the Southern variety, which should be designated 

 as var. salmoides. The oldest name known to apply to the Northern 

 form is that of Bodianus achigan Raf. The Northern form may there- 

 fore be designated as Microptcrus salmoides var. achigan, whenever it is 

 deemed desirable to call attention to these variations. 



The body is appreciably longer and slenderer in var. salmoides than 

 in var. achigan, the head being about 3J in length instead of about 2J. 

 The anal rays in salmoides are usually 10 instead of 11 ; the dorsal 

 formula X, I, 12, instead of X, 1, 13. The scales are larger in salmoides, 

 there being about 70 in the lateral line instead of 77. The coloration of 

 salmoides is uniformly unlike that of achigan. Tiie lower part of the sides 



