CATFISH GENUS NOTURUS RAFESTESQUE 



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9 Noturus gyrinus 

 O Noturus lochneri 



Map 1. — Distribution of Noturus gyrinus (Mitchill) and Noturus lachneri, new species. 

 The symbols represent localities from which specimens have been examined. The dashed 

 lines outline the known and hypothetical range of Noturus gyrinus. One line, extending 

 from Texas to Saskatchewan eastward to Quebec and New York, bounds its general 

 range. A second line surrounds the upland region of the eastern United States, an area 

 from which the gyrinus is not known. All unverified literature records that seem to be 

 based on gyrinus are from localities within the range as outlined. N. gyrinus has been 

 introduced into at least two places in New England (shown here), into the Snake River 

 basin of Idaho and Oregon, and into Europe. 



from the Hudson River, New York, to the tip of peninsular Florida. 

 On the Gulf coast, it is found mostly below a similar line and ranges 

 westward to the Balcones Escarpment and the Nueces River, Texas. 

 A^. gyrinus is found throughout much of the lower Red River system, 

 upstream at least to Lake Altus, southwestern Oklahoma (personal 

 communication from Dr. George A. Moore). The single specimen 

 from a lake near Poteau, Oklahoma, in the Arkansas basin, may be 

 the result of an introduction. From the lower Mississippi Valley, 



