EXPLANATION OF PLATE VI. 



Tomocerus arcticus Schott. 



Fig. 



1. Dentes, showing spines 



2. Mandible 



3. Tips of the two mandibles 



4. Maxilla 



5. Palp 



6. Labrum 



7. Mucrones 



8. Mutilated antenna 



9. Tip of normal antenna 



Tomocerus niger Bourl. 



10. Dentes, showing spines 



11. Left eye patch 



12. Mucrones 



