INSECTS AFFECTING PARK AND WOODLAND TREES 



599 



Fig. 154 Corythuca 



:i r c u a t a , eggs and 



average length is .01 inch. They are deposited on their broad end, and 

 seem to be somewhat inserted into the substance of the leaf ; they are cov- 

 ered completely by a brown, sticky substance, which hardens 

 soon after oviposition. It adheres so firmly to the egg, 

 specially to the upper portion, that it is impossible to remove 

 it without crushing the egg. At its upper end this cover- 

 ing of the egg is squarely truncate, giving the whole mass the 

 appearance of a frustum of a cone with a porous lid. From 

 the funnel-shaped summit the young insect makes its exit, 

 and the round hole at this point renders the empty eggs 

 readily distinguishable from those still unhatched. The 

 eggs are usually laid, in groups of from 10 to 30, along 

 young (After Com- both sides of some prominent leaf vein. They bear a much 

 greater resemblance to certain 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 sub- 

 stance 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. It looks under the microscope more like a lobe of 

 a prickly cactus than anything else we can think of. The 

 cast-off skins stick to the leaf, and give it the appearance 

 of being much more seriously infested than it really is. 



The general appearance of a mature individual is well 

 shown in figure 155. It is about l /% inch long. 



Professor Comstock states that the species ordinarily 

 hibernates in the adult condition, and may be found during the winter 

 under the loose bark of a tree or under sticks or stones on the ground. 



Bibliography 



1880 Comstock, J. H. U. S. Dep't Agric. Rep't 1879, p. 221-22 



Ciliated tingis 



Corythuca ciliata Say 



Very delicate reticulate winged insects, about l /& inch in length, may be found on 

 the foliage of buttonwood. 



This species was brought to the attention of Dr Lintner about 1888, 

 and was noticed briefly in his report. It was received by him from Prof. 



Corythuca 

 arcuata, adult (After 

 Comstock) 



