103 



notion that the principal injury to the trees was done by these last 

 year's females, and that if they were removed the damage would be 

 arrested. The real injery, I need not say, is done later in the sea- 

 son by the young hatching from the egg masses which make these 

 females so conspicuous in spring, and early summer. It is possible, 

 however, that the method is a valuable one, as the washing away 

 of the eggs before hatching, may not improbably result in the des- 

 truction of many of them. The young which hatch upon the 

 ground would doubtless, most of them, make their way back to the 

 tree, but if the rubbish beneath the tree were raked and burned 

 after the egg masses had been dislodged by the water, the multi- 

 plication of the pest might probably be kept below the limit of in- 

 jury. 



[Since the above was written, I have received from Mr. S. M. 

 Dunning, of Chicago, who thoroughly tried the hydrant method last 

 June, twigs of a maple tree from which the egg masses had been 

 carefully and completely washed off. The under sides of these twigs 

 were well covered, in March, 1885, with half grown females, ^ — scarcely, 

 if at all, less abundantly so than was to have been expected if no 

 treatment had been applied. The nearest other maples were across 

 a dusty city street, and it is scarcely likely that the young were 

 conveyed so far. A bt)x elder in the same lot, which was also at- 

 tacked by the bark lice, but not treated, may have divided its par- 

 asites with the maple ; but, curiously, this tree had this spring 

 fewer lice than the maple above mentioned. It is, therefore, im- 

 probable that the mere dislodgement of the egg masses with the 

 water jet had any real effect on the numbers of the young lice. In- 

 deed, it may have easily done more harm than good by destroying 

 within the egg masses the larvse of the Coccinellidse to whose mul- 

 tiplication we have to look for the principal check on the increase 

 of the next brood. This is, perhaps, the explanation of the inferior 

 abundance of bark lice upon the box elder, as just mentioned. De- 

 struction of the egg masses by burning, after dislodging them with 

 water, seems to be necessary to any promise of success by this 

 method. Further experiment is needed, however, and will be under- 

 taken the coming season.] 



2. The Oblique-Banded Leaf Eollee. 



(C acacia rosaceana, Harris.) 



This nearly omnivorous species, (not hitherto reported, however, 

 from the maple), was by us found rolling the leaves of Acer dasy- 

 carpitm in May, pupte and larvas collected on the 20th of that month 

 emerging, from July 9 to 13. 



3. Fandcmis lamprosana, Eobs. 

 Order Lepidoptera. Family Tortricid^. 



(Plate XI. Fig. 3.) 



Among the leaf rollers upon the maple, collected May 10, was one 

 of which we kept no description, which resulted in an imago of 

 Pandcmis lamjyrosana. 



