EXPERIMENT STATION BULLETINS. 681 



EXPLANATION OF PLATES. 



PLATE I. 



1. Lecankim corrngatum. — Gland-pores in vicinity of anal plates. 



2. Lecaniiim numisaticum,. — Anal plates and cliitiuized area surround- 



ing them, also gland-pores. 



3. Lecanium cornuparimm. — Derm markings. 



4. Lecanium liriodcndri. — Showing gland-pores cephalad of anal plates. 



5. Lecanium caryae. — vShowing tessellate cell walls especially well. 

 (S. Lecanium caryae. — Showing ordinary derm markings. 



