EXPLANATION OF PLATE XXXIV. 



Fig. I. — Mask of T. tillarga, Hagen. The dotted outline re- 

 presents the head, the heavy outHne, the mask. 

 Seen from the side. 



2. — Mask of Epophthalmia frontalis, Selys. 



3. — Mask of T. limbata, Kirby. Seen from the front. 



4. — Mask of M . annulatus, Selys. 



4a. — Lateral lobe of same. 



5. — Mask of C. heterostylus , Selys. 



5«. — Lateral lobe of same, 



6. — Mask of C, minusculus, Selys. 



6a. — Lateral lobe of same. 



