170 Wisconsin Academy of Sciences, Arts, and Letters, 
EXPLANATION OF PLATE XVII. 
3 e, Arrenurus manubriator nov. spec., 1st leg. 
f, Arrenurus manubriator nov. spec., 4th leg. 
5 d, Arrenurus cardiacus nov. spec., palpi. 
e, Arrenurus cardiacus nov. spec., mandibles. 
f, Arrenurus cardiacus nov. spec., 1st leg. 
g, Arrenurus cardiacus nov. spec., 4th leg. 
h, Arrenurus cardiacus nov. spec., fem., dorsal view. 
i, Arrenurus cardiacus nov. spec., fem., ventral view. 
6 d, Arrenurus parallellatus nov. spec., palpi. 
8 a, Arrenurus cylindratus Piers., dorsal view. 
b, Arrenurus cylindratus Piers., ventral view. 
c, Arrenurus cylindratus Piers., lateral view. 
d, Arrenurus cylindratus Piers., 4th leg. 
10 e, Arrenurus Birgei nov. spec., 1st leg. 
