SILURIDZ. 103 
same in both, yellowish-brown, with a 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. evilis is of N. insignis, but in the latter case the “ starved” 
form is the western one. 
