ANIMAL BEHAVIOR, WITH EXAMPLES 181 



bers of them in a group, but solitary ones were also found. 

 After a time the ant-lion finally retires from his housekeeping 

 and spins a cocoon of silk in the sand (see figure). This 

 usually occurs in the fall of the year, and the winter is spent 

 in this snug abode. 



In the next season the winged insect, shown here on a twig 

 of milkweed, emerges into the outer world. It has four dainty, 

 lace-like wings and the head bears a pair of short, club-shaped 

 antennae, which distinguish it at once from small dragon-flies 

 with which it might be confused. At a suitable time the female 

 deposits her eggs in the sand, one at a time, and from these eggs 

 hatch the remarkable ant-lion larvse which form the theme of 

 this sketch. 



In another chapter on the Habitat of the Orthoptera, the 

 landscape photograph there presented also shows to the left 

 the place where I made the observations of the ant-lions. It 

 may be seen here as a fight, sandy area. This species frequented 

 this spot year after year, though not, of course, the same 

 individuals. 



