142 Annals Entomological Society of America (Vol. VIII, 
The species is not active, although the insects fly well for short 
distances with a distinct buzzing flight, and they may usually be 
picked up with the fingers without difficulty. The males are 
more active than the females and more easily disturbed. Migra- 
tion is evidently slow, as it often happens that one tree may be 
covered with individuals while another in close proximity is 
unmolested. In this locality, under ordinary conditions, both 
sexes appear in nearly equal numbers until about the middle of 
August, after which time the males become scarcer and by the 
first of October have practically disappeared, although the 
females remain abundant until late in November. Females 
have been collected, in fact, some time after the first few snows 
have fallen, but there is no evidence to show that any of the 
adults winter over. 
The nymphs are usually found on the trunk near the ground, 
tightly flattened against the tree in the crevices of the bark, a 
position which makes their protective resemblance truly remark- 
able, and where the gray color and spiny dorsum is conducive to 
a most effective concealment. The larger individuals migrate 
upward and when seen on the branches are found pressed closely 
to the bark in the crotch of a twig or the axil of a leaf, where 
they tend to escape any but the most careful search. They 
are, however, attended by ants in large numbers, and these 
vigilant attendants betray to the collector of the nymphs the 
object of his search. The anal tubes of the immature insects are 
capable of great evagination and from these tubes issues in bub- 
bles the liquid which the ants seek. This liquid appears to be 
secreted more abundantly when the ant strokes the nymph 
with its antenne. When picked up in the fingers the nymphs at 
once eject some of this fluid, sometimes in considerable quan- 
tities. The ants attend the adults as well as the nymphs but 
only the nymphal forms have been observed to give off liquid in 
the manner described. The ants do not hesitate to protect 
their charges, and bite viciously the fingers of the collector who 
seeks to remove the nymphs from the tree. 
MATING AND OVIPOSITION. 
Under natural seasonal conditions mating begins in the field 
about the first week in July. The position assumed in this 
process is the one not unusual in Hemiptera, with the caudal 
extremities together and the heads in opposite directions. The 
