EXPERIMENT STATION EEPOET. 



557 



the infested region, in August and September, 1905, I found that the 

 insect then covered almost the entire State of Massachusetts, had 

 extended into and through New Hampshire, covered a large part of 

 Maine and had even crossed the border into New Brunswick. There 

 has been comparatively little spread to the east and to the south because 

 the prevailing winds in New England during the summer are from the 

 south to southwest, and these determine the direction of distribution 

 for the insect." 



Fig. 17. 



The Brown-tail Moth, Euproctis chrysorrhoea Linn. : male moth above, female below, 



eggs at left, cocoon at right, larvfo below at right. From 



Howard, Div. Ent , U. S. Dept. Agric. 



In the brown-tail moth both sexes are capable of flight, but they 

 are not very active or strong fliers, and rather drift with the wind 

 than attempt to fly against it. Nevertheless, each year sees a spread 

 even against the prevailing direction of the wind, and there seems to 

 be no reason why this insect should not, in the not too distant future, 

 spread over into the Middle States. It is approximately correct to 

 say that it already infests almost or quite the entire New England 

 district. 



