FAMILY CERAMBYCIDAE 



311 



of the larva will vary b}' a week or so, depending upon the climatic con- 

 ditions ; but the end of the month of May and during June may be taken as 

 the period during which the greater bulk of the grubs in the trees change 

 into the pupa state. Larvae hatching from eggs laid by beetles issuing 

 as late in the year as July and August will pupate in these months of 

 the succeeding year. Fully formed pupae have been cut out of the pupal 



Flc. 212. — Section of willow-stem showing entrance-tunnels to pupating- 



chambers and pupating-chambers of .-Eolesthcs sarta. 



Ouetta, October 1905. 



chamber in the trees in September and October. The fact that the fully 

 formed beetles have been taken from the pupal chambers in February 

 indicates that the time passed in the pupal stage is probably about four to 

 five months. 



