396 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



EXPLANATION OF PLATE XXI IL 



Cerococcus quercus Comst. 



Fig. 16. Antenna of intermediate stage of female. 



Fig. 17. Sac of intermediate stage of female; a, larval skin; b, opening in 



tubercle. 



Fig. 18. Sac of adult female; a, larval skin; b, opening in tubercle. 



Fig. 19. Adult male. 



Fig. 20. Cocoon of male. 



Fig. 21. Leg of adult male. 



Fig. 22. Last abdominal segment of adult male. 



Cerococcus corticis Tovitn. 



Fig. 23. First larval stage of female. 



Fig. 24. Tip of abdomen of first larval stage of female. 



Fig. 25. Leg of first larval stage of female. 



Fig. 26. Antenna of first larval stage of female. 



Fig. 27. Adult female; a, antenna. 



Fig. 28. Antenna of adult female. 



