16 
BULLETIN 746, U. S. DEPARTMENT OF AGRICULTURE. 
W inter form (PI. III, fig. 6) : Differs from summer form in the following 
characters: Body tubercles white or pale yellow and not easily distinguished 
from ground color of body. Spiracles black, very distinct, and sharply con- 
trasting with rest of body. Average length (4 specimens) 24.5 mm. 
THE PUPA. 
On molting for the last time the larva enters the pupa stage, the 
quiescent period of the insect. The pupa (fig. 4) at first is white, 
but soon changes to a dark 
brown. It is cylindrical in 
form and bears little resem- 
blance to either the larva or 
the moth. The following 
technical description has 
been written by Mr. Carl 
Heinrich : 
GENERAL CHARACTERS. 
Elongate ; slender, pilifers 
well developed ; maxillary palpi 
present ; prothoracic and meso- 
thoracic legs not extending ceph- 
alad between sculptured eyepiece 
and antenna ; sculptured and 
glazed eyes, labrum, frontocly- 
peal suture, and invaginations 
for anterior arms of tentorium 
clearly indicated ; front ex- 
tended upward into two hornlike 
projections ; maxilla? prominent, 
only half the length of the 
wings; wings extending to mid- 
venter of fourth abdominal seg- 
ment ; mesothoracic legs not ex- 
tending to end of wings; meta- 
thoracic legs extending to, or a 
trifle beyond, tips of wings; 
femora of prothoracic legs 
clearly indicated; antennas not 
reaching tips of wings: body 
roughened but without hooks 
or prominent setaa ; cremaster absent ; posterior end broad ; tubercles of the 
eighth, ninth, and tenth segments developed into stout, sharp, thornlike projec- 
tions ; dorsum of prothorax, mesothorax and metathorax and the first nine 
abdominal segments rugosely scobinate ; on segments 5, 6, 7, and 8 of the abdo- 
men the scobinations form a median band encircling each segment; a deep 
furrow on dorsum separating ninth and tenth abdominal segments ; genital open- 
ing single and slitlike in both sexes ; anal opening a slit terminating in two 
short lines (JJ ; spiracles elongate, oval, moderate, easily distinguishable. 
SPECIFIC DESCRIPTION. 
Sixteen to 20 mm. long; yellow or yellowish brown, darkest at caudal and 
cephalic ends ; the front, clypeus, scobinate areas, and enlarged abdominal tuber- 
Fig. 4. — Pupa of sugar-cane moth borer : a, Dorsal 
view of anterior portions ; ~b, lateral view of anal 
segments ; c, ventral view of entire pupa. 
