426 
The Moths and Butterflies 
dish or pinkish tinge here and there. The larva of II. maia feeds on oak; 
it is brownish black with a lateral yellow stripe, and has large branching 
spines over the body which sting severely. 
In Plate VI, Fig. 4, is shown in proper color and pattern a bizarre 
moth, Pseudohazis eglanterina , not uncommon in the Rocky Mountains, which 
Fig. 61 i. —Larva of Io emperor-moth, Automeris io. (After Dickerson; natural size.) 
we may call the clownt An allied species, P. shastaensis, similarly marked 
and colored, is found on the Pacific slope, and a third species, P. hera, with 
pale yellowish-white ground-color in the wings instead of purplish red, occurs 
in the region between the Rocky Mountains and the Sierra Nevada. 
Two great moths, the imperial (PL VI, Fig. 2) and the regal walnut- 
moth (Fig. 612), are the most impressive of a subgroup of the Saturniina 
called the Ceratocampidae. They are all short-bodied and hairy and show 
for colors exclusively rich warm browns and soft yellows, light purple and 
rose. A curious structural characteristic of the family is the limiting of the 
pectinations on the antennae of the male to the basal half of the antenna. 
The regal walnut-moth, Citheronia regalis (Fig. 612), expands fully 5 inches, 
has a rich brown ground-color on body and hind wings, with the fore wings 
slaty gray with yellow blotches, and veins broadly marked out in red-brown. 
The larva (Fig. 613), 4 to 5J inches long, and yellowish brown, reddish 
brown, or greenish, is distinguished from all other caterpillars by the great, 
threatening, but harmless blue-black horns of the body; it feeds on butter¬ 
nut, walnut, ash, pines, and other trees. Basilona imperialism the imperial 
moth, is as large as the regal walnut, but with ground-color of rich yellow, 
overspread on base and outer part of fore wings and as a spot and band 
on hind wings with soft brownish purple. The larvae when full-grown are 
3 inches long, brown or greenish, thinly clothed with long whitish hairs, 
and bear conspicuous spiny horns on the second and third thoracic segments. 
They feed on hickory, oak, elm, maple, and other deciduous forest-trees, 
as well as on spruce, pine, juniper, and hemlock. The larvae of both these 
