EXPERIMENT STATION EEPORT. 



601 



resting in the pupal skins, and, consequently, had become adults 

 within a few hours. However, the great majority had emerged several 

 days previous, as not a live pupa could be found. 



In East Orange conditions were similar, except that there were 

 more sets on the leaves, owing, undoubtedly, to the fact that the 

 CoccinelUds had not been as abundant. 

 Both on the trunks and in the cottony 

 masses a careful search was again made 

 for eggs of the beetle, but none was 

 seen. None of the CoccinelUds was 

 observed in copulation either on the 

 trees or in the jars at the laboratory. 



There was apparently an extended 

 period of hatching of the eggs of Pul- 

 vinaria, as larvae were yet observed 

 crawling on one of the twigs. It was 

 also noted that the young sets were 

 not fixed permanently, but would read- 

 ily move when urged to do so. When 

 an infested leaf dried up the insects 

 would move to a twig, or if the leaf 

 was lying on the table they would leave 

 as soon as it began to dry and crawl 

 some distance, always toward the light, 

 looking for fresh food. 



July 26th, the first adults emerged from the parasitized sets, and 

 on each succeeding day more parasites were obtained. They closely 

 resembled those of the hibernating scales, except that they were dis- 

 tinctly smaller. They were determined as CoccopJiagus flavoscuteUum 

 by Dr. Ashmead. 



July 27th, a few leaves were collected from slightly-infested trees 

 in Newark. There were only a few of the cottony masses on the twigs 

 from which these leaves had been obtained, but the latter were well 

 set with young. By actual count, I found over 400 on one, and from 

 all appearances this would have been a moderate estimate for the 

 majority of the infested leaves. Apparently the CocdneUid had not 

 been present on these trees, and I found this apt to be the case where 

 the infestation was slight. Parasitized sets were also observed on some 

 of these leaves; some bore two or three, while one bore six. All were 

 situated along the veins on the underside, but undoubtedly this was 



Fig. 34. 



Parasitized Scale on a leaf; shows 



characteristic discoloration and 



hole from which parasite has 



issued; enlarged. Original. 



