Tht StTHCture and Habits of Spidirs. 73 



fine tubes, much finer than those of the spin- 

 nerets, set dose together. 



They also hax'e on the last joint but one of 

 the hind-li^s a comb of stiff hairs, called the 

 calamistrum, Fig. 34. on the upper side. 



WTien they spin their peculiar web, they turn 

 one of the hind-legs across under the spin- 

 nerets, so that the calamistrum is just under 

 the cribellum, and the foot rests on the oppo- 

 site kir. Fig. v>- The hind-legs are then 



moved rapidly back and forth ; so that the cal- 

 amistrum combs out from the spinning-tubes. 



