BXPIvANATlON OF PIRATE XXXVII. 



Fig. I. — Mask of M. hasilaris, Selys. 

 2. — Mask of Lestes sp. 

 2a. — lyateral lobe of same. 

 3. — Mask of P. hypermclas, Selys. 

 4. — Mask of C. quadrimaculata, Ramb, 

 5. — Mask of C. miniata, Selys. 

 6. — Mask of C. marginipes, Ramb. 

 7. — Mask of P. gravelyi, Laidlaw. 



