402 THE CANADIAN ENTOMOLOGIST 



black, conical tops being visible. Mcst of the eggs were found in 

 the basal half of the leaf, and none at the tips where the veins were 

 finer. The basal ends were inserted only slightly in the tissue, 

 and each egg could be easily removed. 



By the third week in June, a few second stage nymphs, many 

 third and fourth, and a few fifth, were found. By the end of the 

 first week in July, quite a few adults of the first brood were present 

 together with many fifth stage nymphs. Eggs were deposited 

 soon afterward in uninfested leaves, and during the last week in 

 July first stage nymphs of a second brood were observed. Dur- 

 ing the last part of August and first part of September adults of a 

 second brood appeared and later went into hibernation. Thus it 

 is seen that there are two generations, each requiring about six 

 weeks. On account of the extended oviposition period, it is possible 

 at times to find all nymphal stages and adults and more or less 

 overlapping of the broods takes place. 



After hatching, the nymphs feed in colonies on the under leaf 

 surface, causing a discoloration of the upper surface. In severe 

 infestations, the leaves become yellow and dry, and many fall to 

 the ground. The dorsal surfaces of all nymphs are covered with 

 minute spines in addition to the larger tubercles and spines. As 

 the nymphal stages advance, the insects tend to become broader 

 and flatter; the lateral margins become flatter and more con- 

 spicuous, and the spines and hairs more pronounced. 



Egg. — Length 0.51 mm. Greatest width 0.14 mm. Elongate 

 oval, slightly curved when viewed laterally. Basal end rounded, 

 gradually narrowing to distal end, which is covered with a conical 

 cap, below which is a constriction. Widest at basal third. Basal 

 one-half to one-third translucent, remainder dark brown to black. 



First Nymphal Stage. — Length 0.5 mm. Greatest width ex- 

 clusive of spines 0.2 mm. Broadly elliptical. General colour 

 brown, lightest at posterior end of thorax and anterior end of 

 abdomen. Fine median dorsal line beginning on head and ex- 

 tending through the second abdominal segment. A single broad, 

 dorsal light band extending from head to posterior end of abdomen. 

 Entire dorsal surface covered with minute spines. Eyes not 



