EXPERIMENT STATION BULLETINS. 683 



PLATE II. 



1. Lecanium conii.— Showing ordinary derm markings; pores ar- 



ranged radially. 



2. Lecanium corni. — Old specimen heavily chitinized. 



3. Lecanium corni. — Showing tessellate arrangement of cells frequent- 



ly to be seen in certain preparations. 



4. Lecanium nigrofasciatum. — Showing row of gland-pores arranged 



in row extending cephalad from anal plates. 



5. Lecanium prunastri. — Showing derm markings; specimen from 



Austria. 



6. Lecanium prunastri. — Showing derm markings cephalad of anal 



plates. 



