AMMOPHILA AND HER CATERPILLARS 



The egg, which is laid upon the side of the sixth or 

 seventh segment, hatches in from two to three days; the 

 larva spends from six days to two weeks in eating, and 

 then spins its pale yellowish cocoon. 



The nesting habits of urnaria closely resemble those 

 of the other members of the genus, as reported by vari- 

 ous observers. The spot chosen is in firm soil, sometimes 

 in open ground, but much more frequently under the 

 leaves of some plant. The plan is a very simple one. 



iM*^J#Sts4fc^^ 



NEST OF AMMOPHILA 



A tunnel of about an inch in length leads to the pocket 

 in which the caterpillars are stored. There is no harden- 

 ing of the walls in any part. We took pains to draw 

 every nest that we opened, and there was a very con- 

 siderable variation in the minor details, such as the ob- 

 liquity of the entrance tunnel, the shape of the pocket, 



31 



