23 
0.2 to 0.4" in length. These, as well as the three following stages, 
are of a brown or purplish-brown color, the eyes deep purplish, and 
the antennz and legs pale dusky. All are covered with a delicate, 
pruinous pubescence, intermixed with a short, glistening and hair- 
like secretion which gives to them a moldy or bluish appearanee, all 
of which in the two following stages becomes gradually so dense as to 
cover the entire insect. There are also, as in former generations, two 
medio-dorsal and a marginal row of short, transparent, and iridescent 
waxy rods, issuing from short secretory tubercles. In this stage 
there are about twelve tubercles along the front edge of the head, two 
or three each side on the thoracic segments, one each side on the 
abdominal segments, and two at the end of the body. There are also 
two tubercles about the middle of the head, two medio-dorsal groups 
of two pores each on the thoracic segments, and two median tubercles 
on the abdominal segments. Antenne and legs are stout and rather 
long, with two small bristles on the front of the head, a long bristle at 
the apex of the second antennal joint, and three short and spine-like 
bristles at the tip of the last; digitules and bristles of tibize and tarsi 
as in previous generations. The rostrum is stout, highly developed, 
and reaches to the abdomen. 
In favorable years these larvee become frequently so numerous as 
to cover the entire underside of some of the leaves of the witch-hazel, 
in consequence of which numerous predatory insects, such as larvee 
of Syrphid flies, Chrysopids, Coccinellids, and various mites make 
their appearance and commence their work of destruction, so that 
within a few days they may be found with great difficulty. 
Female, seventh generation, second to fourth stage.—In the follow- 
ing three stages they resemble each other closely, except that they 
gradually grow larger, become more convex and more pyriform in 
shape, and that the antennz and legs grow longer and stouter. All 
are dark purplish, and densely covered with hair-like secretion. The 
secretory tubereles increase gradually in numbers and prominence, 
whereby the segmentation of the body is strongly brought out. In 
the fourth stage they measure about 1™™ in length. The legs and 
antennee are considerably longer and stouter than in the other stages, 
though otherwise very similar, and the rostrum shorter, reaching only 
between the anterior and median coxee. There are now two large groups 
of secretory tubercles at the front of the head; a group of 20 to 24 
each side of the prothorax, 17 to 20 each side of the mesothorax, 11 to 
16 or more each side of the metathorax, 8 to 10 each side of the first 
three segments of the abdomen, 3 to 6 each side of the other four seg- 
ments, and about six on the terminal one. There are also two median 
groups of 7 to 10 tubercles on the head between the eyes; two medio- 
dorsal groups of 10 to 15 on each of the thoracic segments; 8 to 10 
or more on the four anterior segments of the abdomen, and from three 
to six on the other three segments. 
