594 



NEW JERSEY AGRICULTURAL COLLEGE 



within the parasitized insects. Conditions continued the same for the 

 next few days, except that the scales developed rather rapidly and 

 irregularly. By May 15th many of the insects measured three-six- 

 teenths of an inch in length, while the smallest were only ahout half 

 as large. The character and condition of tlie scales also varied con- 

 siderahly. In many cases the healthy and parasitized scales were about 

 equal in number, while on other twigs there were only a number of 

 partly developed, dead insects, and occasionally some old parasitized 

 forms. Sometimes the live scales were grouped, while in other cases 

 they were set pretty evenly along the lower side. Some of the para- 

 sitized forms were placed in a bottle to develop. 



May 17th, a few twigs were received from Montclair and tbe insects 

 on them carefully examined and counted. There were 180 live, de- 



Fig. 30. 



Full-grown female Ecale ready to reproduce ; underside on the left ; upper surface on 



right ; legs same actual size as in Figure 28 ; much enlarged. Original. 



veloping .scales, 1:40 parasitized scales and several undeveloped and 

 half-grown dead forms, or by actual count two and one-half times as 

 many parasitized as healthy insects. As compared to the conditions in 

 February, the twigs examined at this time averaged eight inches in 

 length and showed eleven good scales and twenty-nine that were 

 parasitized. 



May 18th, seventeen parasites emerged from the scak-s in the bottle, 

 and these were determined by Dr. Ashmead as Coccopkagus lecanii 

 Fitch., a very small, black Hi/menopterovs insect, witli a yellow spot 

 between the base of the wings. May 23d, when more twigs wore ex- 

 amined, 108 developing scales, 353 parasitized forms and a few dead or 



