PERGANDE NORTH AMERICAN PHYLLOXERIN^. 253 



on the ground, and a considerable number could be found on the 

 stumps of old Hicoria and other trees and in the cracks of the soil. 



On June 12th the first winter eggs were discovered, most of 

 them upon twigs that had been infested with galls. They were 

 most numerous in old galls, in the cracks around and about them 

 and in the old bark, often as mafiy a fifty packed closely together 

 intermixed with the dead and empty skins of the females. They 

 were also found in the depressions caused by the shed leaves of 

 the previous year, as also at the base of the new growth, especi- 

 ally where surrounded by a fringe of hairs, under and between 

 which the eggs were thrust ; also in the angles formed by the 

 petioles and upon the twigs, in the old, dead and rather hairy or 

 fuzzy buds, and, in fact, in any crack or perforation upon the tree. 

 ' Some were even found between old leaves on the surface of the 

 ground and under the loose bark of a piece 9f old grape-vine lying 

 beneath the tree ; in the sheltered places afforded by an old oak 

 stump near by, as well as under the loose bark of a Dogwood 

 ( Cornus florida) . 



On June 19th a more careful examination of the trees showed 

 that the eggs became more numerous as one ascended the tree. 

 At a . distance of about thirty feet from the ground they were 

 extremely abundant, being closely packed under the loose bark 

 of dead twigs, in crevices and under and between lichens growing 

 upon the trunk. 



None of the eggs had hatched on July i8th though large num- 

 bers had been destroyed by various natural enemies, especially by 

 different mites belonging to the genera Tyroglyphus, Rhizoglyphus , 

 Hypopus, Scirus, Nothtus, and Oribata. An examination July 30th 

 showed that none of the eggs had yet hatched. 



November 20th they were still unhatchedbut sound. 



February 6th, 1884, they were again examined and found to be 

 in good condition. 



On March 15th none had yet hatched. 



On April ist, notwithstanding the devastations of the mites 

 before mentioned, and other destructive agents, a number of sound 

 eggs remained. At this time they were somewhat more yellowish 

 than in the previous autumn, rather mqre swollen and smoother, 



[PbOc. D. a. S., Vol. IX.] 31 I Dec. a, 1903.] 



