12 PROCEEDINGS OF THE ACADEMY OF [Jan.^ 



of 30 to 40 eggs beneath their wings and die. The eggs hatch in about 

 a week and the young remain on the leaves without developing until 

 spring, as in case of most of the young from the second brood of eggs 

 by the apterous individuals. 



When abundant, early in the summer, the little snowy white patches 

 concealing the apterous females and their young are so numerous as 

 to attract attention to the foliage (PI. V, figs. B, C and D). Wlien the 

 first brood from eggs for the year hatch and settle upon the new leaves, 

 the latter often become crooked and disorted in shape and yellow in 

 color (PI. V, fig. C). I do not think I have ever seen a tree killed by 

 this louse., but they are often made to look v.ery unthrifty and sickly in 

 color of foliage. 



Hibernating Female. — The hibernating female, or stem-mother, 

 grows very little if at all, after hatching from the egg the previous June 

 or July, until the warm days of spring. The color, which seems black, 

 is reall}^ a very dark green and the body is fringed all round with short 

 white threads of waxy secretion, and down the middle of the back there 

 is often a crest of the same threads, though these are not always present, 

 and the entire dorsal surface is finely dusted with wax particles that 

 glisten with a silvery white light. The setse are considerably longer 

 than the bod}^ and are inserted in the leaves, through the fall and 

 winter (PI. VI, figs. A and A^). The length before spring develop- 

 ment varies little from .4 of a millimeter. The antenna is three- 

 jointed and little exceeds a front tibise in length, first and second joints 

 short and stout and about equal in length, and the third joint fully 

 one-half longer than joints 1 and 2 together, and quite scabrous in 

 appearance due to transverse impressed lines, and with about four 

 hairs at the tip. About the middle of April the liquid excretion is being 

 given off freely, and the waxy secretions now begin to show plainly as 

 transverse roAvs of white spots across the dorsal surface (PI. V, figs. 

 A. A.). When the winter skin is shed, the louse changes to a rusty 

 brown color, darker towards the head. Adult specimens measure from 

 .8 to 1.2 millimeters in length and from .6 to .9 mm. in greatest 

 breadth. The antenna is still short, three-jointed, the third joint 

 rather longer than joints 1 and 2 combined, and the whole length 

 about .09 mm. (PI. VI, fig. E). 



The icax glands are arranged about as in cooleyi, but the pores are 

 larger and fewer in number, at least for the glands anterior to the 

 fourth abdominal segment (PI. VI, figs. B and C). On the head there 

 are three gland patches on either side, and then there are three rows on 

 a side over the succeeding body segments to the sixth abdominal ; on 



