EXPEKIMENT STATION REPORT. 595 



undeveloped insects were counted. On this and several successive 

 days numerous parasites emerged in the laboratory from the collected 

 material, but it was not until the 26th that I found them outdoors. 



About this time a new phase in development occurred. On twigs 

 collected at Newark it was noted that some of the insects were be- 

 ginning to secrete from points on the under surface a cottony ma- 

 terial, and apparently the increase in size had ceased. This cottony 

 material was excreted from narrow areas near th^ base of the anterior 

 and hind legs, extending in a line to the margin and from a spot near 

 the anus, making five in all. These places had been noticed in the 

 hibernating insects before any secretions occurred, but a few days 

 later (June 2d), when the insects showed the cottony secretion in 

 greater amounts, it was noted that it was also exuded in single fibers, 

 from minute openings situated in a rather broad group along the 

 margin, extending somewhat parallel with and back from it, and espe- 

 cially abundant around the anal area. 



On this date, too, eggs were observed under some of the insects. 

 Several scales, each with a small hole in the upper surface, near the 

 end, through which a parasite had emerged, were also noted, and a 

 few of the parasites were observed on the twigs. The developed 

 scales at this period were somewhat variable in size, but averaged 

 about a quarter of an inch in length and were broadly oval in outline. 

 Owing to the fact that they were filled with eggs they were rather 

 plump and convex. 



Development was proceeding at about the same rate in all the 

 infested localities, although somewhat irregularly. Twigs from Mont- 

 clair, June 5th, showed eggs within the cottony masses, and they were 

 similar to those observed at Newark, but some insects had not yet 

 begun to even show the cottony secretions. By this time most of the 

 parasites had emerged, but a few in the Montclair material had not, 

 and upon opening infested scales I found fully-developed adults ready 

 to emerge and one still in the pupal stage. 



With the increase in the number of eggs deposited, the cottony 

 material also increased and became more prominent than the insect 

 itself, the posterior part of which was lifted by eggs and cottony 

 material until it formed almost an angle of forty-five degrees with 

 that part of the body which remained against the twig. The itisects 

 were found in this condition at Montclair, as early as June 15th. 



The examination at this time also showed that numbers of a 

 Coccinellid larva were upon the twigs, attacking the Pulvinaria egg 



