1879. | Zoology. 325 
2). One of them, probably the anterior, is nearly marginal, and 
is interrupted in the middle, while the other is nearly central, and 
in place of the interruption at the middle, it has a V-shaped pro- 
jection back or away from the other line. The form of the scale 
is quadrangular, and not unlike that of a turtle (Fig. 1). When 
fully developed it is a little more than three-sixteenths of an inch 
ong, and a little more than two-thirds as wide. 
ere at Lansing, the small, yellow, oval eggs appear late in 
August. In Tennessee they would be found under the scales in 
- their cotton wrappings many days earlier. The eggs are one- 
fortieth of an inch long, and one-sixty-fifth of an inch wide. 
These eggs, which are very numerous, hatch in the locality of 
2 
their development, and the young or larval lice, quite in contrast 
with their dried, inert, motionless parents, are spry and active. 
They are oval (Figs. 3 and 4), yellow, and one twenty-third of an 
inch long, and one-fortieth of an inch wide. The eyes, antennz 
(Fig: 5) and legs (Fig. 6) are plainly visible when magnified 
thirty or forty diameters. The nine-jointed abdomen is deeply 
eMarginate, or cut into posteriorly (Fig. 3), and on each side of — 
this slit is a projecting stylet or hair (Figs. 3 and 4), while from 
between the eyes, on the under side of the head, extends the long 
recurved beak (Fig. 4). The larvæ soon leave the scales, crawl 
about the tree, and finally fasten by inserting their long slender 
beaks, when they so pump up the sap that they grow with sur- 
prising rapidity. In a few weeks their legs and antennz disap- 
pear, and the scale-like form is assumed. In the following sum- 
“mer the scale is full-formed and the eggs are developed. Soon 
the scale, which is but the carcase of the once active louse, drops 
from the tree, and the work of destruction is left to the young lice, 
a responsibility which they seem quite ready to assume. 
n my observations I have detected no males. Judging from 
others of the bark-lice, these probably possess wings, and will 
never assume the scale form, though Prof. P. R. Uhler writes me 
