were found on these trees for a distance of nearly a mile and a half. 

 Streets crossing Columbia Road were then followed until no cocoons 

 could be found for several blocks, and the approximate outline of the 

 infested territory was thus determined. This is very irregular in 

 form but as a whole extends farther south-west from the probable 

 center of infestation than in any other direction, and the longest 

 distances in the territory are almost two miles in a north-east, south- 

 west direction by a mile and a half at right angles to this. 



This territory is rolling ground, with several hill-tops perhaps a 

 hundred feet higher than streets an eighth of a mile away, and it was 

 very noticeable that on the hill-tops in most cases no cocoons could 

 be found. This and the fact that where the infestation is slight 

 most of the cocoons are not high up in the trees would suggest that 

 perhaps the moth does not fly high under usual conditions. 



FOOD PLANTS. 



The cocoons were almost invariably present on Norway maples 

 which may be considered their preferred food. Other kinds of 

 maples were occasionally infested to a slight extent. Near the outer 

 limits of the infested area the Norway maples were almost always the 

 only trees infested, but toward the center others were added. So far 

 as could be judged by relative abundance of the cocoons the Norway 

 maple, pear, apple and cherry (cultivated and wild) were the most 

 favored food plants though cocoons were also found on the crab- 

 apple, willows, black birch, cut-leaved white birch, oak, American 

 elm, Wahoo elm, blackberry, beech, poplar, mountain ash and buck- 

 thorn. One cocoon found on a rose bush was probably accidental 

 as this bush was directly under a cherry, and was the only infested 

 plant of its kind though large numbers were examined. Cocoons 

 were not found on the peach, hickory, sumach, horse chestnut, gingko 

 or spruce though these were frequently met with in the infested area. 



ABUNDANCE. 



Near the apparent center of infestation the cocoons were very abun- 

 dant, as many as a hundred being found on a tree in some cases. 

 Judging from the distribution of the cocoons the eggs are not laid in 

 clusters but perhaps half a dozen or less on a tree by a single moth 

 and the larger numbers would represent the deposition of eggs by 

 quite a number of insects. 



