254 



ELEMENTARY ZOOLOGY. 



FIG. 99. Spiders (Epeir 



irmorea). After McCook. 

 right. Natural size. 



Male on left; female on 



Questions on the Figure. What differences do you note with 

 respect to the sexes? What habits of the spiders are correlated 

 with this difference in size in the sexes? 



FIG. ioo. Web of Epeira strix, an orb-weaving spider. After McCook. 

 Questions on the Figure. By reference to other texts or by obser- 

 vation determine if there is any regular order in which the parts 

 of the web are produced. To what is this kind of web an adapta- 

 tion? Evidences? What other forms of web are made for similar 

 purposes? 



