PROGRESS REPORT OK THE EUROPEAN CORN BORER 
73 
Fig. 37. — Pupa of the European 
corn borer, lateral and ventral 
views. About three times nat- 
ural size 
beneath the mesothoracic ; prothoracic legs terminating half way be- 
tween the head and the tips of the wings ; prothoracic femora plainly 
indicated; antennae terminating short of the wings. Labium and 
pilifers well developed; labial palpi small. Proleg scars visible on 
the sterna of abdominal segments 5 and 6; a pair on each segment. 
Dorsum of the thorax bearing a slightly elevated ridge extending 
along the dorso-median line; thorax 
only slightly humped. Abdominal spi- 
racles small, oval, slightly produced, 
rings stoutly chitinized, blackish 
brown. Caudal segment terminating in 
a dark-brown or black cremaster, prom- 
inent, spatulate, stout, longer than 
broad, and armed at its extremity with 
a series of 5 to 8 recurved spines, which 
serve to fasten the pupa to its cocoon 
or to a pad of silk spun by the larva 
prior to pupation. The pupa ordinarily, 
but not always, is enveloped in a very 
thin cocoon. The anal and genital open- 
ings are slitlike in both sexes. 
The sexes are readily separated by 
comparing the position of the genital 
opening with the seventh abdominal 
spiracles, which are constant or fixed in 
their position. In the female the genital 
opening is cephalad of the seventh ab- 
dominal spiracles, whereas in the male the genital opening is cauded 
thereto. 
ADULTS 
(Fig. 38) 
MALE 
Alar expanse 20 to 26 millimeters; length of body in both sexes 
13 to 14 millimeters. 
Head and thorax cinnamon brown on the thorax; white ventrad. 
Labial palpi porrect, snow white ventrad, otherwise grayish fuscous. 
Maxillary palpi erect, slightly dilated at apex. Proboscis long, cov- 
ered with cream-colored scales, tightly coiled and almost hidden 
when viewed laterad. Antennae filiform in both sexes, terminal 
half curled in dried specimens, two-thirds the length of the cephalic 
wings. 
Prothoracic legs snow white outwardly, slightly fuscous inwardly ; 
mesothoracic and metathoracic legs white. Inner spurs on legs twice 
the size of the outer ones. Cephalic and caudal wings equal in width, 
costal margin gently curved toward the apex, anal angle rounded, 
inner margin straight. Cephalic wings reddish brown or grayish 
fuscous, with a bright ochreous discal spot and a like colored ser- 
rate band running the width of the outer third of the wing. This 
band is frequently cut into by extensions of the grayish fuscous 
coloration present on the outer third of the wing, so that at times 
the band tends to be broken up into series of lunate spots. Hind 
wings dark grayish fuscous, with a broad median fascia which does 
not attain the cephalic or caudal margins of the wing. Male speci- 
