DESCRIPTION OF PLATES. Xlll 



FIG. PAGE. 



181. Hair of English bat 61 



182. Tran verse section of hair of peccary 61 



183. Pith-like hair of musk-deer 61 



184. Hair from tiger caterpillar 61 



185. Branched hairs from spider 61 



186. Hair from flabellum of crab 61 



187. Portion of four of the barbs of a goose-quill 62 



188. Swan's-down 62 



189. Head and mouth of flea 62 



190. Head and mouth of bug 63 



191. Head and mouth of louse 63 



192. Head and mouth of gnat 63 



193. Extremities of barbs of the sting of common bee. . 64 



194. Head and mouth of bee 64 



195. Head and mouth of butterfly 66 



196. Head and mouth of blow-fly 65 



197. Head and mouth of one side of spider, showing 



poison-fang 65 



198. Foot of common fly 66 



199. Foot of bee 67 



200. Foot of spider 67 



201. Head of common spider, showing nine simple eyes 



a. Cornea of one of these more magnified 65 



202. Skin of garden spider 65 



203. Portion of compound eye of fly . 63 



204. The two wings of bee in flight 67 



205. Spiracle of fly 66 



206. Spiracle of Dytiscm 66 



207. Thread of garden spider 65 



