ss a 
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DESCRIPTION AND LIFE History. 
Hgg (Pl. HU, fig. 2 and 2 A.) —Diameter 1.65 millimeters, height 0.85 millimeter ; 
of a rather flat, oblate-spheroidal shape, yellow-glabrous when first laid, with 
crimson, subcentral ring and central spot covering the micropyle, and developing 
after two days. The under surface nearly flat, glabrous; upper surface minutely 
punctured. It adheres strongly to the leaf surface. 
The eggs of Padraona chrysozona Plitz are always laid singly upon the leaf, 
thus differing from those of Hrionota thrax Fabr., which may be found in groups 
of from 8 to 15. 
The period of incubation is from seven to eight days. 
Larva (PI. I, fig. 3).—Length 3.5 millimeters, width of head 1.2 millimeters; 
upon emerging from the egg. At this stage the larva is of a pale, greenish-yellow, 
with a black head, the size of which appears somewhat disproportionate to that of 
the body. A very fine, light-grey, sparse pile covers the body, especially the 
posterior segment. 
The full-grown larva measures 45 millimeters in length and 4.5 millimeters in 
width, the head being 3.75 millimeters in diameter. It is of a pale, ocher-green, 
semi-transparent, permitting the viscera, especially the heart and the malpighian 
and urinary glands, to be seen readily through the skin. The head, which is about 
one-tenth the length of the entire body, is biscuit shaped or of a very flat, oblate- 
spheroidal. The surface is strongly and coarsely punctured. The ecdysical 
sutures are strongly marked by narrow sulci. It is of a glabrous, tawny, flesh- 
color. A dark-brown line extends from the base of each mandible around the side 
of the head to the occiput, where it is deflected forward, following the ecdysical 
suture and being again deflected toward the side of the head, ending in a sharp 
point, the lines of each side thus forming a Y on the median, dorsal aspect of the 
head. The ocelli, which lie in the beginning of the dark line posterior to the 
mandibles, are 6 in number on each side and of a dark-brown. The mouth parts 
are dark-brown and glabrous and are surrounded by a rather coarse, porrect. pile. 
The anal segment is glabrous and its posterior margin is strongly rounded, with 
numerous, white, curved sete projecting from it posteriorly. The legs are light 
yellowish-buff with many white sete on their lower surfaces. The abdominal feet, 
of which there are 10, are strongly pubescent. The spiracles, which are functional 
on the Ist and 4th to the last body segments, are of a light-yellow. 
Pupa (Pl. II, fig. 4 and 4 A).—Length 25 millimeters, width 4.5 millimeters. 
The pupa is of a glabrous, dark-brown, but is frequently so covered with a 
white, flocculent substance that its true color is not apparent. It is strongly 
seto-pilose, especially on the anterior dorsal part of the head and thorax and on 
the abdominal segments. The sete upon the thorax project anteriorily, those 
upon the abdomen posteriorly. Very dark-brown rings extend around the apical 
margins of the 4th, 5th, and 6th segments. The proboscis extends to the apex of 
the 6th, its apical fourth being force free and traversely rugose. 
A very remarkable feature of this pupa is the form assumed by the prothoracic 
spiracles. They are completely protected by a reniform patch of dense sete and 
are located one on each side of the posterior dorsal margin of the pronotum. 
See Pl. II fig. 4 B. 
Imago, male (PI. II, fig. 1)—Length of body 15-16 millimeters, length of 
fore-wing, 15.5-17.5 millimeters. Ground color, bright, yellow-ocher, with the fol- 
lowing dark-brown markings or suffusions: The veins and a more or less oblit- 
erated longitudinal patch along the posterior part of vein VII,, and VII, from the 
base for one-half its length, in some specimens suffused with yellow-ocher; a 
similar, somewhat wider patch from the end of the cell to a point its own length 
from the outer margin. In some specimens this patch is confluent with the basal 
