Fic. 97a.—Tibicen septendecim Linn.: A, male of 
typical f»rm—natural size; c, d, genital hooks—en- 
larged; ¢g,singing apparatus—natural size; B, male, 
of the small form (Cassinii)—natural size; e,f, gen- 
ital hooks. After Riley, and Hagen, Div. of Ento- 
mology, Dep. of Agriculture. 
LE Fic. 97c.—a, twig showing recent 
a AOE sa punctures, from front and side, and 
Fic. 97f.—a, tip of abdomen of female from beneath illustrating manner of breaking; b, 
b, the sheath inclosing the top of the ovipositor; c, twig showing older punctures, with 
voipositor from below; d, ovipositor from above; e, retraction of bark—natural size. 
ovipositor from side—enlarged; c, d, e, not quite After Riley, Div. of Entomology 
four times actual size. After Smith. Dep. of Agriculture. 
Fic. 97b.—Cicada septendecim Linn.: a, recent puncture, front view; b, same, surface re- 
moved to show arrangement of eggs, from above; c, same, side view; d, egg cavity ex- 
posed after eggs are removed and showing the sculpture Je't by the ovipositor—all en- 
larged. After Riley, Div. of Entomology, Dept. of Agriculture. 
