656 The Maple-Tree Bark-Louse. [ October, 
Illinois, now in the hands of the printer, from which this article 
is drawn. The illustrations are from the pencil of J. H. Emerton. 
Mr. J. Duncan Putnam, of Davenport, Iowa, has given much 
time and study to the embryological development of this species; 
his valuable paper will appear in volume ii, part ii, of Proc. 
Dav. Acad. of Nat. Sciences, now in press. 
During the winter months the females remain on the under- 
side of the limbs in a dormant state (fig. 2, a), the beak inserted just 
under the bark. The greatest irregularity exists in reference to 
_ the position which they assume on the limbs, the bodies often- 
times overlapping each other, and when greatly crowded lying in 
opposite directions with the exception that they are always found 
lying lengthwise with the limb. 
s They are at this time not 
over 2 mm. in length, much 
the color of the bark, oval 
in form and with a slit at 
posterior end; when raised 
from the limb the legs and 
antennz are plainly visible 
(fig. 2, ó and c). As soon as 
the sap commences to flow 
in early spring, with us near 
the middle -of April, the 
z, insect absorbs nourishment 
Fic. 2.—a, females on limb as in winter; 
dorsal view of female; c, ventral view of the from the tree and by the 
same, 4 and c greatly enlarged. ee of the eggs 
ithin the body t tly distended. Atthis time small liquid 
drops are seen 1 upon the ground and sidewalks underneath the 
fested trees, ‘which is both sweet and sticky. This liquid issues 
_ from the pores of the body and continues until a waxy secretion 
is observed issuing from the posterior portion. This secretion 
issues from the general under surface but n more particularly from 
the thorax and abdomen. 
Projecting from the sides of the body can be seen, under a com- 
mon lens, short thick hairs; from these points and from between 
the abdominal joints a portion of the waxy mass is secreted, but 
from around the anus comes the greater quantities. 
In this cottony secretion the eggs are concealed, the work go- 
in ing on ee since we find the first eggs in the mass shortly 
