LIFE HISTORY OF CARPENTER ANT. 



207 



as a summer host. In fact Wheeler found, July I, 1905, six 

 larvae of X. cava in a nest of Formica incerta, and since the 

 European relatives of the beetle are found mainly with this genus 



Fig. 7. Galleries in solid ash wood which were inhabited by C. ferrugineus. 



of ants, it seems quite probable that the summer host of X. cava 

 may be some one or more of the Formicas. During the month of 

 June, 1907, it was my hope to discover the summer host and I 

 accordingly opened a good many nests of Formica in the vicinity 

 of the woods in which I found the beetle most abundant, but was 

 unable to find a trace of either adult beetle or of larvae. I did, 

 however, find adult beetles in the nests oi C . ferrugineus at differ- 



