395 
or less distinctly reddish; the wings are clear or faintly brownish, with 
the costal cell and stigma dusky and the veins blackish. They are 
slightly covered with a white and powdery secretion and, when not 
rubbed, have also two small tufts of a dense and white secretion on 
the scutellum, a similar tuft or patch each side on the thorax, and 
some fibers or flakes of secretion on the abdomen. Antenne five- 
jointed, reaching only to the base of the wings; the two basal joints 
are short, with joint two almost globular; the third joint is longest, 
and as long as the remaining two combined; the last two are subequal 
in length, all three are densely and deeply annulated. There are 
between twenty-seven and thirty-two annulations on the third joint, 
twelve to fourteen on the fourth, and eleven to thirteen on the fifth 
joint. The head is broader than long and distinctly conical in front; 
eyes large. The legs are rather short and slender, the digitules highly 
developed. Tail small, transversely cval and knob-like, tuberculated, 
and hairy; the last segment is bilobed, and each of its lobes furnished 
with numerous, rather long hairs. The wings are large and broad 
and are carried flat on the back when at rest; the stigma is broadly 
lanceolate and somewhat broadest at the base of the stigmal vein. 
The venation is similar to that of Hormaphis hamamelidis, though 
the second discoidal vein joins the first much nearer its base than in 
the other species. The first discoidal of the posterior wings is rarely 
entire, and is usually represented by a small stump; sometimes it is 
wanting. 
Third, or Coccidiform, generation.—Atter having fully matured the 
winged form leaves the witch-hazel galls and migrates to the leaves 
of birches to deposit their larvee, which after a short time of feeding 
move to the twigs and branches and settle down close to a bud for 
their future transformation and for hibernation. Their growth 
appears to be very slow, and many of them perish before the approach 
of spring, so that usually but very few adult females will be found. 
Third generation, first stage (Fig. 17).—The young larve of the 
migrant from witch-hazel are very peculiar, and resemble more closely, 
when seen on the twigs, the larve of a Lecaniid than those of an Aphid. 
They are about 0.4"™" in length, about twice as long as broad, oblong- 
ovate, and rather flat above. <A slightly elevated rounded carina runs 
trom the head to the end of the body, which is traversed by fine 
impressed lines, indicating the divisions of the body but failing to 
reach the lateral margin. There is also a rather deep fovea each side 
of the carina on the prothorax and a puncture each side of the carina 
on the other two segments of the thorax. The abdomen in compari- 
son with the rest of the body is very small, or only about one-third or 
less of its length. The dorsum is densely granulated and more or less 
polished. The lateral edges are studded with about 30, and the front 
of the head with 16 to 18, short, truncated, and cylindrical secretory 
3 04-— INO. 4 —Ol-—=3 
