Plate XXXVI. 



Fig. 1, Irt. Cenini hurvaVis, Stage I. 



Fig. 2, 2a. Ceriira borealis, Stage II; '2I>, uatural size ami attitude. 



Fig. 3, 3«. Centra borealis. 



Fig. 4, ia. Cenira eincrea: 46, face. 



Fig. 5, 5a. Centra mtiltiscripta; 56, face. Bridgham del. 



Fig. 6. Centra horvnlis, larva on jioplar, Georgia. Lcconte <lel. 



Fig 7. Centra horeiilis, larva on willow, Maine. Wilder del. 



Fig. 8. Centra occidentalis. Lintuer del. (Dr. Dyar thinks this is einerea.} 



364 



