DESCRIPTION OF PLATES. 



XIX 



FIG. *AGB 



208, Head of common spider, showing eight simple eyes, 



a. Cornea of one of the; e more magnified 85 



209. Skin of garden spider $5 



21C. Portion of compound eye of fly 8 



211. Portions of the two wings of bee in flight 88 



a. Nervule of wing. 



212. Spiracleoffly 86 



213. Spiracle of Dytiscus S6 



214. Threads of garden spider (Epeira diademaj ...... 86 



Simple thread of the same. 



Thread of a concentric circle with viscous Jots. 



PLATE VIII. to face page 88. 



215. Fore leg of Gyrinus natator, whirligig beetle .... 87 



216. Middle leg of the same 87 



217. Hind leg of same 87 



218. Fore leg of male Dytiscus 87 



219. Middle leg of the same. 



220. a. Gizzard of cockroach 89 



6. PHto, cut open. 



221. a. Gizzard of cricket 89 



b. Ditto, cut open. 



^J2. Trachea from caterpillar 86 



-i8. Proleg of caterpillar of common garden white 

 butterfly, with the membranes in which the 



nooks are seated, expanded as in action ...... 8-b 



224. Part of leg of cockroach 



225. Battledore scale from blue argus butterfly gft 



226. Scale of ordinary shape from same 3$ 



2^7. Scale from meadow-oro^vn butterfly $$ 



^28. Scale of gnat , ., 33 



