ORCHARD INJURY BY HICKORY TIGER-MOTH. | 5 
PUPA. 
(Pl. III, fig. 2.) 
Length, 10 to 18 mm; width of thorax, 6 mm; width of abdomen, 7.5 mm. 
The abdomen is much stouter than the thorax and there is a slight constriction 
between them; the wingpads extend to the fifth abdominal segment; on the 
caudal end is a transverse row of spines recurved at the end. Color when 
newly transformed, yellowish, but soon becoming reddish brown; margins of 
segments and spiracles darker. 
6 
\ i IMAGO. 
(Pl. III, fig..1.) 
- The following is Harris’s original description of the moth (1): 
* * * very light ochre-yellow in color; the fore-wings are long, rather nar- 
row, and almost pointed, are thickly and finely sprinkled with little brown dots, 
and have two oblique brownish streaks passing backwards from the front edge, 
with three rows of white semitransparent spots parallel to the outer hind 
margin; the hind-wings are very thin, semitransparent, and without spots; and 
the shoulder covers are edged within with Hght brown. They expand from 
one inch and seyen-eighths to two inches and a quarter or more. The wings 
are roofed when at rest, the antennz are long, with a double narrow, feathery 
edging, in the males and a double row of short, slender teeth on the under-side, 
in the females; the feelers are longer than in the other Arctians, and not at all 
hairy; and the tongue is short but spirally curled. 
FOOD PLANTS. 
The hickory tiger-moth is usually recorded as a general feeder on 
the foliage of deciduous trees and shrubs. No less than 49 host 
plants from wwlely separated families have been listed by various 
observers. However, this wide range of food plants is confined to 
the nearly mature larva. The number of food plants upon which 
larve can develop from egg to pupa is much smaller and, as far as 
the writer has observed, is restricted to trees of the walnut and 
hickory family and to pomaceous fruits. 
The writer has reared larvee from egg to pupa on Japanese walnut, 
English walnut, black walnut, apple, and pear. In the field, colonies 
have been found frequently on all of the above and also on butter- 
nut, quince, and once on white hickory. In spite of its name walnut 
and not hickory seems to be its favorite food plant. An egg mass 
was found on a sour-cherry leaf, but a colony of larve were never 
found feeding on cherry in the field. Miss Soule (8) records finding 
an egg mass on a thorn leaf (Crataegus sp.). 
The lots of larvee which were fed on black walnut, Japanese walnut, 
English walnut, pear, and apple all reached the pupa stage and 
appeared normal. In the early larva instars the development was 
about the same. The later instars on Japanese walnut developed 
