Plate XXXYI. 



Fig. 1, In. Cerina hnreiilis, Stage I. 



Fig. 2, 2a. Ceriira borealis, .'^tage II; 2/i, natural size ami attitiule. 



Fig. 3, 3«. Centra borealis. 



Fig. 4, 4«. Centra cincrea; 46, face. 



Fig. 5, 5a. Centra miiltiscrijila; 56, face. Bridghaui del. 



Fig. 6. Centra borealis, larva on jioplar, Georgia. Lecontc del. 



Fi(i 7. Centra borealis, larva on willow, Maine. 'Wilder del. 



Fi(i. S. Centra occidental is. Lintner del. (Dr. Dyar thinks this is eiHcrea.) 



364 



