TJu Striictitic ,uid Habits of Spiders. 23 



The spinning-glands, //, lie above the spinner- 

 ets, and along the under side of the abdomen. 

 They will be more fully described in the chapter 

 on spinning. 



POISOX-GLAXDS. 



The poison-glands, ;;, are partly in the basal 

 joints of the mandibles, and partly in the head, 

 and discharge by a tube which opens at the 

 point of the claw of the mandible. Fig. 1 5 , a. 



CLASSIFICATION. 



There is not room in this book to explain the 

 classification of spiders into genera and species ; 

 but a description of the following well-marked 

 groups, which contain nine-tenths of all spiders, 

 vcill give a general idea of the differences among 

 them, and help to understand what follows. 



MVGAHD.E. 



This family includes the largest known spi- 

 ders. The body is usuall}^ ver\- hairy and dark- 

 colored. Most species have only four spinner- 

 ets ; and one pair of these are iong, and are 

 turned up behind the abdomen. They have 



