108 



U.S. NATIONAL MUSEUM BULLETIN 2 82 



SCALE OF MILES 



40° 



- 35" 



80" 



75» 



Map 7. — Distribution of Noturus gilberti Jordan and Evermann. So far as known this 

 species is confined to the areas of Virginia indicated by the symbols. 



waters of the Roanoke River, but in recent years specimens have 

 been collected from the Mayo River and headwaters of the James 

 River system adjacent to the Roanoke River. Specimens of Noturus 

 leptacanthus and N. insignis have been reported as gilberti. 



Etymology. — Noturus gilberti was named for Charles Henry 

 Gilbert, an outstanding American ichthyologist. 



Relationships. — The species is very distinct and does not appear 

 to be closely related to any other kind of Noturus. It is assigned to 

 the subgenus Schilbeodes because of its common characters, but in 

 some respects, chiefly color pattern, number of paired fin rays, and 

 vertebral elements, it resembles Noturus jiavus. 



Ecology. — Hubbs and Raney (1944, p. 24) indicate that N. gilberti 

 was taken from a rubble riffle. Specimens seem to prefer to hide in 

 relatively fast water riffle habitats, beneath large stones and debris 

 that is not swept away by the current. Noturus insignis is a common 

 associate of gilberti. 



Subgenus Noturus Rafinesque 



The subgenus Noturus contains only one species, Noturus jiavus 

 Rafinesque, the type-species of Noturus. N. Jiavus has been placed in 

 Noturus since recognition, except for irregular inclusion in the genus 



