1 6 The Structure and Habits of Spiders. 



actions of the Entomological Society of Lon- 

 don, a large spider which has teeth on the 

 inside of the palpi, which, when the spider is 

 angry, are rubbed against teeth on the mandi- 

 bles, producing a noise. 



MANDIBLES. 



The front pair of limbs, the mandibles, Fig. i, 

 D, are two-jointed. The basal joint is usually 

 short and stout, and furnished on the inner side 

 with teeth and hairs. The terminal joint is a 

 small and sharp claw, which can be closed 

 against the basal joint when not in use. 



ABDOMEN. 



On the under side of the abdomen, just 

 behind the last pair of legs, are two hard, 

 smooth patches, which cover the front pair of 

 breathing-organs, the openings to which are 

 two little slits at Fig. I, H. Between these is 

 the opening of the reproductive organs, and, in 

 female spiders, the epigynum, Fig. J, J, — an 

 apparatus for holding the reproductive cells of 

 the male. 



At the end of the body are the spinnerets, 



