3] 
eight bristles. Antenne short, stout, and four-jointed; the two basal 
joints are shortest and stoutest, each bearing a bristle near the apex; 
joints 3 and 4 are longer and subequal in length, the third is clavate, 
and the fourth elongated oval; each bears a small thumb near the apex, 
and the fourth three small capitate hairs and a small spine at the tip. 
The rostrum is stout and reaches beyond the anterior coxe. Legs 
short and stout; the digitules of the claws apparently wanting. 
That the stem-mother of this species is extremely prolific was proved 
by the fact that one mature gall, found July 9, contained, besides the 
stem-mother, 220 of her progeny, in various stages of development, 
from the recently deposited larvee to the winged migrants, the old 
mother being at the same time still very plump and almost globular, 
containing yet a large number of embryos, which, after all have been 
deposited, may increase her descendants to about 500. The galls are 
sometimes so completely crowded with the insects as to allow but little 
room for them to move about. 
Second generation, first stage.—The young larve of this generation 
are brownish-red or grayish-green and gradually develop into the 
migratory form. They measure between 0.4 and 0.8™™ in length, and 
are about twice as long as broad, with almost parallel sides. The 
head is nearly straight or broadly rounded in front, and bears a 
rounded, fleshy tuberele. The abdomen is about one-half the length 
of the body; its segmentation very distinet. The head and prothorax 
are confluent and as long as the combined meso- and metathorax. 
The rostrum is stout and reaches almost to the hind coxe. Antenne 
four-jointed, curved inward, short and stout; the two basal joints 
are stout and short, the third and fourth are subequal in length; 
the third is clavate and the fourth slightly tapering; each bears a 
cylindrical and movable thumb. Legs stout and rather long; there is 
a rather long bristle near the apex of the femora; two, externally, on 
the tibiz and one or two on the tarsi; digitules long, slender, and 
apparently simple; those of the claw are wanting. There are also 
four or more bristles along the front of the head, two each side of the 
thoracic, one each side of the abdominal segments, and four at the 
end of the body. 
Second generation, second stage.—In this stage they are still very 
similar to the young larvee, though they are much stouter and about 
1.2" in length. The antennz are now distinctly five-jointed, rather 
stout, and still more curved inward; the two basal joints, as usual, 
are short, the first stoutest; the other three grow gradually some- 
what longer, the fifth being somewhat the longest and thinnest; joints 
two and four are clavate, the third cylindrical, and the last one con- 
ical, its tip rounded; the last two joints, as usual, bear each a small 
thumb. The rostrum reaches to the median coxe. 
Second generation, third stage.—In this stage they are still larger 
and stouter, and measure about 1.4 to 1.6™" in length. The future 
