SILURIDiE. 103 



same in both, yeilowish-brown, wifclia lateral dark streak and two more 

 dorsal ones. The lower barbels are usually dark in sialis, pale in 

 gyrinus. The outline drawings of the two which accompany this paper 

 shows the differences better than they can be expressed in words. 



Noturus gyrinus is apparently a starved representative of Noturus 

 sialis as N. exilis is of JV. insignis, but in the latter case the " starved " 

 form is the western one. 



