376 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 



This destructive borer was, iu 1884, still at work in Maine, where we 

 have made such observations on its egg-laying habits and the mode of 



Fig. 138. — Mine of Olycohius speciosus, one-third natural .size. 



life of the freshly-liatched larva, that it now seems possible to prevent its 

 entry into the heart-wood by cutting it out of the bark in the autumn. 



