Figs. 



1-6. 



Plate XI. 



Scisenophilus tenuis P. J. van Beneden, $ . (p. 63.) 



1. Dorsal view (natural size). 



2. Dorsal view (enlarged). 



3. Dorsal view (cephalothorax only). 



4. Ventral view (cephalotnorax, right half only). 



5. Mandible. 



6. Caudal rami. 



(After P. J. van Beneden.) 



