30 CONTRIBUTIONS TO NORTH AMERICAN ICnTHYOLOGY III. 



The second pociiliju ity of tlie Tngaloo fauna is tliat its cliaracteiistic 

 fislii's are all of types abundant in tbe Tennessee River, but not known 

 IroMi any other of the Athmtic streams. Of these may be mentioned 

 Photogcnis gtilacfurus, Luxilus coccogenis^ lIijdroplthKt rubricroceiis, and 

 Cntostomutt nigricans. The close proximity of the sources of the Tujjaloo 

 and tin- Little Tennessee, War Woman CneU and Little Tennessee lliver 

 risinj^ on opposite sides of Rabun Gap, and of the Tallulah and the 

 Uiawassee, may perhaps help to explain tliis anomaly of distribution. 



ETIIKOSTOMATIDJi]. 

 Genus IIADROPTERUS A(/assiz. 



I. HaDROPTERUS NIGROFASCIATUS yl.</. 



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

 Falls. 



CEXTRAECHIDJE. 

 Genus MICROPTERUS LacepMe. 



1*. MlCROPTERUS SALMOIDES {Lac.) GUI. 



(Var. aahnoidcs.) 



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

 (/. 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 Lahrns sabuoi- 

 (Its of Lacepeile was collected by Bosc near Charleston, S. C. It w;is 

 therefore presumably the JSouthern variety, which should be designated 

 as var. salmoidcs. 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 M icmptcrus salmoides var. achigan, whenever it is 

 deemed desirable to call attention to these variations. 



Tlie body is appreci.d)ly longer and slenderer in var. sabnoidcs than 

 in var. achigan, the head being about .'i^ i" length instead of about L';^. 

 'I'lie anal rays in salmnidcK are usually 10 instead of II; the dorsal 

 lortnula X, 1, iL', instead of X, 1. I.'I. The scales are larger in salmoides, 

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

 sahnuidoi is uniformly unlike that of achigan. Tlie lower part of the sides 



