116 THE GYPSY MOTH. 



come a certainty is shown by the developments of the season 

 of 1895. As has before been stated, there are in this region 

 three centres of infestation of at least a thousand acres each. 

 (See page 87. ) These centres are included in a belt of wood- 

 land a mile in width, which is all more or less infested, 

 reaching with some interruptions from East Lexington to 

 Salem, a distance of about eighteen miles. 



As compared with 1889 the moths in open and cultivated 

 lands are now much reduced in numbers in the worst in- 

 fested sections and are elsewhere extinct or comparatively 

 rare. On the other hand, in the belt of woodland north of 

 the centre of the infested region they occupy more ground 

 than in 1889, and the number of badly infested places is 

 greater. 



