MEMOIRS OF THE NATIONAL ACADEMY OF SCIENX'ES. 



97 



(PI. LX, figs. 2, 2«, 3J, etc.). Penis complicated; consisting of the slender style-like penis proiwr 

 forked at the end, and a wider broad triangular accessory or guard-plate (PI. XL, fig. S,\ p^) 

 situated above it. In the four North American species there seems but little difference in the 

 different parts of the genital armature, and these can be best l>rought out by reference to mv 

 camera drawings in Plates LIX. XLl. 



E(/(f. — Elliptical, flattenod, each end alike, a little longer than broad; shell ver}- tliin, parcli- 

 ment-like, the surface with obscui'ely marked microscopic irregular hexagonal areas. The eo'o-s 

 are laid in large patches on leaves. 



Larva. — Body cylindrical, slightly tlattened at the end; armature consisting of two recurved 

 slender smooth mesothoracic horns; prothoracic spines reduced to low tubercles; all the other 



Fig. 12. Disiribution of tlie Reniis Anisotii. 



dorsal and lateral spines of the body sujall, conical, acute: the two dorsal spines of the eighth 

 al)dominal segment separate, remote, not fused into a median or caudal iiorn, l)ut the two tubercles 

 / I on the ninth segment fused into a caudal horn. Suranal plate rugose or gramdated, with 

 from three to four lateral and two terminal stout conical spines. Body with conspicuous lon<>-i- 

 tudinal bands or stripes. 



Young larva, ntage I. — Body not spiny with the exception of a i)air of smooth horns a little 

 longer than the body is thick, slightly divided at the end, each division bearing a long seta. The 

 other spines represented by minute setiferous tubercles; tubercles I i being present. Suranal 



