FIG. 167. Periodical cicada 



a, adult ; , young nymph (enlarged) ; c, cast skin of full-grown nymph ; d, side view of 



female to show beak, e, and ovipositor, f. .(Natural size except b.} (After Marlatt and Riley, 



United States Department of Agriculture) 



FIG. 1 68. Buffalo tree-hopper and twig of apple tree showing eggs and adult 



Adult (enlarged) at left ; a, adult (natural size) ; <5, recent egg punctures ; f, bark reversed 



with eggs in position; d, single row of eggs (enlarged); e, wounds of two or three years' 



standing on older limbs. (After Marlatt, United States Department of Agriculture) 



I2 3 



