108 



FORTT-FIRST REPORT ON THE 8 TATE MVSEUM. 



anterior margins ciliate with short spines : scutel with the lateral mar- 

 gin elevated and an acute, highly elevated carina on the middle: 

 hemelyira dilated, with an inflated carina before the middle of each, on 

 which is a brown spot; edge ciliate with short spines, excepting the 

 posterior third and tip, which are unarmed, rectilinear; beneath 

 piceous-black: feet pale yellowish. 



Length to tip of hemelytra, three-twentieths of an inch. 



The larva is spinous, fuscous, with a large yellowish spot each side 

 of the middle, and before the middle a broad yellowish vitta. The 

 species is very common. 



Hibernation of the Insect. 

 But little appears to be known of the natural history of this Hemip- 

 teran. One interesting fact therein is, the hibernation of the mature 

 insect under the bark of trees on which it feeds. This appears from 

 examples that were sent to Mr. Walsh for name, from Mr. J. Pettit, 

 C. W., which had been found " in great numbers under the bark of 

 button-wood in the winter " (Walsh, loc. ciL). 



Compared with C. arcuata. 

 As closely resembling G. ciliata, a figure is herewith given (Figure 42) 

 in illustration, of another com- 

 mon species, Corythuca arcuata 

 of Say, which differs from the 

 former in its brown bands and 

 the arquated exterior of the 

 hemeJytra. In Figure 43, its eggs 

 are represented on a bit of leaf. 

 They bear so little resemblance 

 to the eggs of insects generally, 



that their nature would hardly Fig. 43.- Eggs and 



■'an immature indi- 

 be suspected. In the same figure, viduaiof Cobythuca 



an immature form of the insect is shown. They are aecuata. 

 not at all uncommon on the under side of the leaves of various species 

 of oaks. The illustrations are from Professor Comstock's Report to 

 the Department of Agriculture for 1879, in which an account of this 

 " hawthorn Tingis," so designated from the food-plant on which it 

 occurred, is given. From differences that it shows with typical forms 

 of G. arcuata, Mr. Uhler regards it as a variety of that species. For a 

 figure, habits, description, etc., of the more general form, see Cassino's 

 " Standard Natural History," ii, p. 285, fig. 327. 



Dr. Fitch (3d Report, 1859, p. 148) has described G. juglandis, occur- 

 ring on the leaves of the butternut, and differing only in its rectilinear 

 form and spineless veins from G. arcuata. Later {Gount. G^enf.,Feb. 14, 

 1861, p. 114), he has accepted it as probably a mere variety of arcuata. 



Fig. i%— Cobythuca 

 ABcuATA, from oaks. 



