748 RosBeRT MATHESON 
Both the winged males and the winged females are active, capable of 
flying very considerable distances and of walking or running with con- 
siderable agility. In the rearing cages they would fly actively about, 
being strongly attracted to the sunny side, or would walk over the fine 
wire mesh or cheesecloth. When liberated they flew away with a 
vigorous, direct flight. 
The winged female 
The females on reaching the Boole usually seek out the underside of 
the leaves. Here they secure nourishment and deposit their young — the 
wingless oviparous females. They do not produce large numbers of 
young, nor do they deposit them in any one place, but seem to prefer 
to migrate from leaf to leaf depositing but a few young at a time. 
The early instars of this form are identical with those of the spring 
migrant in practically every detail, and therefore it seems unnecessary to 
repeat the details here. . 
The mature winged female, fall migrant (Plate Xxvye Length 1.7- 
2 mm.; wing expanse 6 mm. 
The autumn migrant is somewhat larger and more robust than the 
spring migrant. In color markings it does not vary to any extent, and 
it is only necessary to refer the reader to the description of the winged 
female of the third generation on apple. These winged forms, however, 
are frequently darker than the spring forms, appearing almost black, 
and agreeing very closely with the description given by Fitch (1855 a). 
The antennae are 6-jointed and black. The third segment bears about 
60 sensoria, the fourth about 30, the fifth from 6 to 12, and the sixth 
the usual group. The length of the segments is as follows: Segment III, 
0.6-0.72 mm.; Segment IV, 0.4-0.5 mm.; Segment V, 0.25—0.32 mm.; Seg- 
ment VI, 0.12-0.15 mm. + 0.6-0.7 mm. The head lacks the dorsal tuber- 
cles present in the spring migrant; very small lateral tubercles are present 
on the prothorax and on the abdominal segments; the last two abdominal 
segments are without dorsal tubercles. The cornicles are cylindrical, 
slightly curved, and distinctly flanged at their tips (fig. 115, 5, page 706). 
The male 
The males are not so numerous as the females and usually appear 
later in the season. They are not so heavy-bodied and are more active. 
