﻿128 Neiv York ^fatc CoJJege of Fon'siri/ 



placed in definite egg-niches in the sides of a gallery. The usual 

 type of burrow consists of an irregular cavity in the inner bark 

 and outer sapwood. The eggs are laid in an irregular mass at 

 any place in this cavity and are covered with the sawdust-like 

 frass which often fills nearly the entire chamber. After laying 

 their eggs the adults will often leave their burrow, usually by bur- 

 rowing a second opening up through the bark. Several such 

 deserted burrows were found where the eggs were still unhatched. 

 The burrows are most commonly, but by no means invariably, 

 started at the base of a smaller twig. 



Other species of bark beetles associated with C. mai)iensis in the 

 same limbs and twigs include Polygraphus rujipennh Kirby, 

 fitijophthorus puherulus Lee, P. dentifrons n. sp., P. shepardi 

 n. sp., P. opaculus Lee. and Xylechimis americanus n. sp. 



