578 INDEX. 



Order parasitse continued. PAGE 



Ricinus ...... . . . 181 



Order Aphaniptera 182 



Fleas 182 



Chigoe . . . 183 



Apterous insects . . . . . . .183 



Winged insects . . ...... . .183 



CHAPTEE XII. 



Arachnida, long confounded with the insects . . .184 

 Distinguished by very conspicuous characters . .184 

 Three principal divisions of araclmidans . . . 186 



Mites 186 



Scorpions recognisable by the peculiarity of their ex- 

 ternal configuration . . . . . .187 



Spiders, how distinguished ...... 187 



The implacable foes of insects ..... 188 



The eifects of their poison instantaneous . . . 188 

 Various purposes to which the threads of spiders are 

 converted . . . . . . . . 189 



Mouse-spiders . . . . . . . .190 



Bird-spiders . . . ... . . . 190 



Mason-spiders . . . . . .191 



Their subterranean caverns 192 



Sedentary arachriidans 192 



Lurk near their snares . . . . . . 192 



Rectigrades 193 



Tube-weavers ........ 193 



Web of garden spider . . . . . . .193 



Spiders in Eio Janeiro 193 



Spiders with nets in community . . . . .194 



Tent-making spider . . . . . . .194 



Spider living in a shell . . . . . .195 



Spiders (properly so-called) . . . . . .195 



Water-spider, her diving-bell 196 



Thread-spinners, care of their eggs . . . .196 

 Net-spreading araclmidans ...... 196 



Saltigrades 197 



Vagabond arachnidans . . . . .197 



Wolf-spiders 197 



The tarantula 197 



Leaping-spiders . . . . . .197 



Gossamer-spiders . . . . . . 198 



CHAPTER XIII. 

 Crustacea ... 199 



Articulated animals breathing water 



Land crustaceans, their wet gills . 



Wood-lice fitted for a damp atmosphere 



Senses of Crustacea . 



Their periodical moult 



Diversity of external forms of Crustacea 



199 

 201 

 201 

 201 

 203 

 204 



