U. S. DEPARTMENT OF AGRICULTTJKE 
tinge. The eggs average 0.56 millimeter in length by 0.34 milli- 
meter in width. The moths deposit their eggs singly on the calyx 
end of the nut or on the side of the nut under the calyx lobes. 
LARVA 
The larva (PL I, B at right, and D) is nearly cylindrical, tapering 
slightly toward each end, but more posteriorly than anteriorly. 
Eight full-grown larvae when extended averaged 14.59 millimeters in 
length by 2.08 millimeters in greatest width. The head and mouth 
parts are dark brown, and the prothoracic shield is pale brown, 
bisected by a rather inconspicuous faint whitish area. The general 
color of the body is dirty olive green, darker dorsally and laterallv 
than ventrally. The body is sparsely covered with fine whitisn 
hairs, the skin being quite wrinkled, especially in the thoracic 
region. The thoracic legs are about the same color as the ventral 
part of the body, and each terminates in a single brown claw. 
There are five pairs of prolegs and the anal pair is about twice as 
long as the others. 
PUPA 
The pupa (PL I, B, at left) is of the usual form and without striking 
markings. When first formed it has a decided olive-green cast, 
but with age it changes to a light brown. The abdominal segments 
are finely punctate, the anterior portion of the last segment having 
a dark brown transverse band dorsally. The anal extremity is 
armed with a short, sharp brownish tooth, directed nearly at right 
angles to the body axis, and four slender light-brown hooked spines, 
which arise from the lower part of the tip of the last segment and 
project forward. The size of the pupa is decidedly variable, the 
average measurements for six individuals being 8.1 millimeters by 
2.2 millimeters. The pupa is formed inside the attacked shoot for 
the spring brood (PL IV), and within the infested nut for the first 
and second broods (PL I, E) . Upon issuance of the moth the pupal 
skin is not extended. 
ADULT (PI. I, C) 
The pecan nut case-bearer was first described in 1890 by Hulst (7) 
under the name Acrobasis hebescella. The original description is as 
follows : 
Expands 18-20 mm. Labial palpi blackish gray. Head ochreous fuscous, 
thorax dark fuscous. Abdomen ochreous gray, annulate with fuscous. Fore 
wings short, very broad, strongly arched on costa and inner margin, ochreous 
fuscous, quite dark; lines indistinct, basal hardly discernible, faintly gray, edged 
outwardly with black at costa; scale ridge black, short; outer line dentate, shown 
by black border lines on ground color; discal spots quite distinct, confluent. 
Hind wings dark even fuscous. 
The measurements of moths bred from pecans varied from 14.5 to 
19 millimeters across the expanded wings. 
SEASONAL HISTORY AND HABITS 
All records given for the various stages of the pecan nut case-bearer 
were obtained at Monticello, Fla. In the rearing work pertaining to 
this insect glass jars were used as cages, which were kept in an open- 
air insectary. 
In the discussion of the life history of this species, a " generation" 
is considered to begin with the egg stage and to end with the adult or 
