46 LACE-BUGS. 
Prof. Comstock describes the C. arcuata Say, which he calls 
the Hawthorn Tingis, as follows: 
“This I found very abundant in Washington, puncturing 
the under surface of the leaves of different species of Crategus. 
The infested leaves have a brown and sunburnt appearance. All 
stages were found together. The adult is represented much 
enlarged in Fig. 38. The eggs and immature form are also 
shown. The eggs are smooth, whitish, glistening, semi-trans- 
parent, and ovoid in shape. Their average length is three mm. 
(0.12 inch). They are deposited on their broad end, and seem 
to be somewhat inserted into the substance of the leaf; they are 
covered completely by a brown, sticky substance, which hardens 
soon after oviposition. It adheres so firmly to the egg, espec- 
ially to the upper portion, that it is impossible to remove it with- 
out crushing the egg. At its upper end this covering of the egg 
is squarely truncate, giving the whole mass the appearance of a 
frustrum of a cone with a porous lid. From the funnel-shaped 
summit the young insect makes its exit. The eggs are usually 
laid, in groups of from ten to thirty, along both sides of some 
prominent leaf-vein. They bear a much greater resemblance to 
some forms of fungi, notably the genus Phoma, and to certain 
young Homopterous galls, than they do to eggs of any sort. 
“The immature insect is of the same dirty brown color as 
the substance covering the egg, and but little darker than the 
withering leaf. It is of a broad, flat, oval shape, and spines seem 
to project from almost every portion of its body. Under the 
microscope it looks more like a lobe of prickly cactus than any- 
thing else I can think of. 
“The cast-off skins stick to the leaf, and give it the appear- 
ance of being much more seriously infested than it really is. 
“The dead leaves under the bushes during the winter have 
been often found to contain the living and healthy eggs of the 
Tingis; but the customary method of hibernation is in the adult 
state alone. This form can be found during the winter under the 
loose bark of the tree, and under sticks and stones on the ground. 
These insects can be destroyed by strong alkaline washes or by 
kerosene emulsions. But it is probable that if the leaves and rub- 
bish underneath the trees are destroyed, either every fall or every 
spring, a necessity for remedies will not arise.” 
