44. 
which are slightly capitate; eight of these bristles may be observed 
along the front of the head; two between the eyes; two medio-dorsal 
ones on the thoracic segments and two in front of the tail; also two 
lateral bristles on the thoracic and one each side of the abdominal 
segments. There is now also a large ventro-lateral poriferous plate 
or gland each side on the ventral side of the abdomen, covering seg- 
ments 4 to 6, from which a dense mass of fine white and glistening 
threads of waxy secretion issues, which curves up the sides of 
the body, so as to form a dense brush or rosette, the material of 
which is afterwards used by the female, while in the act of oviposit- 
ing, to cover the sticky eggs with the aid of its hind tarsi to disguise 
them so as to conform with the pubescence of the twigs and buds. 
This habit resembles in this respect that of the sexual females of 
Phyllaphis fagi and certain other species, which have the same habit 
of covering their eggs. The antenne are four-jointed, though some- 
times the fourth joint may be rudimentary or wanting; the third 
joint is much the longest and about twice the length of the fourth; 
both are more or less distinctly or sharply serrate and both bear the 
usual movable thumbs. The rostrum is highly developed and reaches 
to the median coxze. The legs, claws, and digitules are well devel- 
oped and similar to those of previous stages. The tail is small, knob- 
like, transversely wrinkled, beset with minute spines, and bears two 
bristles. They contain from one to five rather large eggs, which fill 
the greater part of the body. 
Sixth generation, male.—The mature male is very small, or but 
slightly larger than the young larve and only about one-third-the size 
of the mature female. It measures about 0.4"™ in length, and is com- 
paratively very slender, being broadest across the mesothorax, taper- 
ing gradually toward the end of the body. The head is broadly 
triangular, with the apex slightly concave. The eyes are prominent 
and reddish-black. The rostrum is stout, highly developed, and 
reaches to the median cox. Antenne slender, four-jointed, and 
reach when laid backward to the anterior femora. The third joint is’ 
much the longest and about twice the length of the fourth. Both are 
rather sharply and densely serrate. Joint 3 is cylindrical and bears 
from two to three movable, sensorial thumbs, and the fourth joint 
one or two at the base of the short spur and two or three small hairs 
at the apex. The legs are more slender and comparatively longer 
than those of the female; tail small and knob-like. All of the pores 
have disappeared. The hairs or bristles of the head and body are as 
in the female. The male is extremely active after attaining its full 
development and runs briskly about over the surface of the leaves. 
On account of its smallness and general resemblance to the larva, it 
is extremely difficult to distinguish it from female larva. 
O 
