132 • MISCELLANEOUS FOREST INSECTS. 



Division II. 



SUBDIVISION D. 



L. linearis (Goeze). — Extensive observations have been made on 

 the habits of this species. It is common in commercial prochicts of 

 seasoned hickory, oak, walnut, and ash, and occasionally in poplar, 

 wild cherry, and locust. It is not recorded from natural growth in 

 this country, but is said to infest such t^rowth, as w^ell as commercial 

 products, in Euro])e. 



THE GENUS LYCTOXYLON. 



L. japonum Keitter. — Found in walking stick from Japan and in 

 commercial articles made from bamboo in China. 



THE GENUS MINTHEA. 



M. rugicoUis (Walker). — Habits not recorded in specimens in the 

 national collection. 



M. stichoihrix (Reitter). — Habits not recorded. 



DISTRIBUTION. 



The distribution of the species of the family Lyctidse presents some 

 interesting features, especially in regard to the natural habitat and 

 the temporary and permanent introductions. 



The habits of some of the species which infest commercial products 

 make it possible for them to be widely distributed outside of their 

 natural range, but it does not necessarily follow that a species intro- 

 duced to another country in commercial products will become estab- 

 lished in its new environment. Therefore we find many records in 

 literature of localities in wliich specimens of a species have been col- 

 lected, some of which evidently represent accidental or temporary 

 introductions. Some other records may be held in doubt as to per- 

 manent introduction until they are verified by observations which 

 would indicate that the localities are either within the natural range 

 of the species or that the species has become established. 



It would appear that the most reliable guide to the natural distri- 

 bution of the species is their habit of Rving in natural growth and 

 under natural conditions of exposure to climatic influences at all 

 seasons of the year. 



In a study of the records represented by specimens in the national 

 collection and of the evidentlv authentic records in literature, it 

 would appear that tlie distribution of the species of the family Lyc- 

 tidse in the western continent is between about the forty-eighth paral- 

 lel north and tJie thirtieth parallel south, and in the eastern continent 



