16 INSECTS INJURIOUS TO FOREST AND SHADE TREES. 
a white cotton-like substance, the fore wings with an oval salt-white spot near the 
tip of their outer margin; the veins being obsolete. Length to the tip of the wings 
0.12 inch. On walnut bushes in Illinois. (Fitch.) 
36. THE HICKORY APHIS. 
Lachnus carye (Harris). 
Order HeEmMriprerA; family APHID. 
Living in clusters on the under side of limbs of the pig-nut hickory early in July, 
very large plant-lice + inch long, with no terminal stylet and very short horney tubes; 
body covered with a bluish white bloom or down, with four rows of little transverse 
black spots on the back; top of thorax and veins of wings black, as are also the 
shanks, feet and antennie, while the thighs are reddish brown. (Harris.) 
AFFECTING THE LEAVES. 
37. THE LUNA SILK MOTH. 
Actias luna (Linneus). 
Order LEPIDOPTERA; family BOMBYCID&. 
Devouring the leaves in August, a large thick-bodied caterpillar, about three inches 
long, apple green, each segment with six small bright rose-red elevated dots, and low 
down along each side a pale yellow line running lengthwise immediately above the 
lower row of dots, from which line at each of the sutures a pale yellow line extends 
upward upon the sides. Spinning a large oval cocoon, which is found among the fal- 
len leaves; the moth, one of our largest insects, appearing late in May and during 
June; pale green, with eye-like spots in the center of each wing, the hinder pair pro 
longed into two long, broad ‘‘ tails.” 
38. THE REGAL WALNUT CATERPILLAR. 
Citheronia regalis (Hiibner). 
Order LEPIDOPTERA; family BOMBYCIDA. 
A spiny caterpillar five inches long, our largest species, green, with a red head and 
tail, and stout, sharp, black and red spines, and black and red feet; not spinning a 
cocoon, but the larva enters the ground in September to transform to a chrysalis, 
which in July changes to a very large bright orange-red moth, with the fore wings 
pale olive spotted with yellow, the veins stained reddish, and the hind wings orange- 
red. 
This is our largest caterpillar; it is harmless, though so formidable in 
appearance, and easily recognized by its size and by the four long horns 
on the segments just behind the head. It feeds on the black walnut, 
butternut, hickory, persimmon, and sumach, and is very rare north of 
New York, and is scarce in the Middle and Southern States. 
39. THE HICKORY TUSSOCK MOTH. 
Halesidota carye (Harris). 
Order LEPIDOPTERA ; family BOMBYCID&. 
In July and August and early September, eating the tender leaves at the ends of 
the branches, snow-white caterpillars, over an inch long, with rows of round black 
