660 The Maple-Tree Bark-Louse. | October, 
made to exterminate them. Whether this is due to the greater 
number of the young lice proving to be males or from the visa 
of parasites remains to be determined? 
Wings membraneous, hyaline, dotted with short points extend- 
ing outward, sending out at the base a forked line, one toward the 
upper, and one toward the lower margin. Mons. V. Signoret says 
in his essay on Lecanides, that in the place of the lower wings of 
the male there are two halters or balancers, which I have been 
unable to discover in the mounted specimens before me, 
although it is quite possible that they may be found in fresh 
specimens. The females continue absorbing nourishment during 
the remainder of the summer and return to the limbs at the 
approach of frost in the autumn. In Fig. 1, Mr. Riley has 
illustrated the egg-mass as occurring upon the leaf, which is con- 
trary to my experience in Illinois and Iowa, although were the 
season longer it might be the case, and thus become double- 
brooded since it is well known that the varied temperature | has 
great effect upon the length of time insects remain in their several 
stages. 
‘Three kinds of Lady-birds ( Coccinelide), are found more or less 
numerous upon the infested trees destroying the acericorticis 
during the summer months. The Hyperaspis signata Olivier is 
perhaps the most abundant and valuable. The larva is small, 
light colored,and covered with a peculiar white downy substance. 
They are found inside the waxy mass devouring the eggs, and 
through their assistance many are thus destroyed before hatch- 
ing. The outside of the egg-mass appears entire, but by care- 
fully separating it, the larva can be observed, in the act of devour- 
ing the contents of the egg, by the aid of a common lens. Only 
one larva is found in each egg-mass. When fully grown and 
about to change to the pupa state, they emerge and attach them- 
Selves to the tree. The imago is a small black beetle with one 
bright red spot on each elytra. 
The Chilocorus bivulnerus Muls. (Fig. 5), although not found in 
such numbers as the signata are equally as important since they 
nium acericorticis male, see Fig. 4. Color fuliginous, with the thoracic 
“se oascits darker than the PEIR AE D of the body. Head small, angular in front, an nd 
atthe sides. Antennæ 10- s pp filiform, pubescent, fourth, fifth and sixth longest. 
Color light brown. There are two ocelli between the antenn Thorax large, the 
-~ mesothoracic band distinct, shiny, the metathorax forming an arebat shield extend- 
inga short distance over the abdomen. Legs stout, sparsely covered with hairs, tarsi 
furnished with two claws at the end. Abdomen ends in a tubercle which protects 
De p he entire nearly half as long : as abdomen. 
