EXPI.ANATION OF PLATE XIII. 



Gennadas praecox, sp. nov. 



Fig. I. — Antennal scale, X 8. 



J J 2. — Right-half of the petasma, folded naturally, X i6. 



,, 3. — The same unfolded, X 16. 



,, 4. — Second maxilla, X 16. 



Gennadas alcocki, sp. nov. 



Fig. 5. — Left-half of the petasma, X 16. 



,j 6. — The apex seen from the other side, X 30. 



,, 7. — Antennal scale, X 8. 



,, 8. — Thelycum, X 16. 



Gennadas scutatus, Bouvier. 



Fig. 9. — Part of the second maxilla , X 70. 

 10. — Left-half of the petasma, X 30. 



