644 



NEW YORK STATE MUSEUM 



United States Department of Agriculture. The following is a brief abstract 

 of his detailed account : Winter eggs are deposited in rough places on 

 the stems of witch-hazel, from the middle of June to early in July and 

 remain unhatched till the following May or June, thus being dormant 

 almost I 2 months. The egg is quite flat, about ',25 inch long and is covered 

 with a glistening, hairlike secretion harmonizing well with the twigs [fig. 

 177J. The recently hatched young are yellowish green and densely pubes- 



Fig. 179 H a tn am el i stes s p i n o s u s, 3d 

 generation: rt^hibernatinK larva ; i^=antenna; 

 c=rostrum or beak ; rf=tarsus ; f=Ialeral 

 tubercles and waxy rods, much enlarged 

 (After Pergande, U. S. Dep't Agric. Div. 

 Ent, Tech. Ser. 9, 1901) 



Fig. 180 H a m a m e 1 i s t e s s p i n o b ir s, 

 3d generation: rt=dorsal view of adult 

 female; iJ^Iateral view; c=ventral 

 view ; rf=antenna ; r, /, and g=legs, 

 much enlarged (Aft^r Pergande, U. 

 S. Dep't Agric. Div. Ent. Tech. Ser. 

 q, igoil 



cent or hairy and almost invariably locate on the side of buds next the twig. 

 The irritation caused by the insect checks the growth of the petiole and 

 hastens that of the bud, specially on the side opposite the insect, which 

 lengthens, broadens, curves over the gall maker and soon assumes a 

 beautiful rosy color. The plant louse is completely inclosed in a few days, 

 only a transverse scar and small opening where the insect settled, remain- 

 ing. The gall is now globular and hardly larger than the original bud. It 

 develops rapidly and by the middle of June is about half grown, chang- 



