526 Wisconsin Academy of Sciences, Artsand Letters. 
EXPLANATION OF PLATE. 
la, Arrenurus caudatus (de Geer), dorsal view. 
b, Arrenurus caudatus (de Geer), ventral view. 
c, Arrenurus caudatus , (de Geer), lateral view. 
2a, Arrenurus Morrisoni nov. spec., ventral view. 
b, Arrenurus Morrisoni nov. spec., lateral view. 
c, Arrenurus Morrisoni nov. spec., dorsal view of the appendage. 
d, Arrenurus Morrisoni nov. spec., palpus. 
