420 
Journal of Agricultural Research 
Vol. XXIV, No. 5 
Genitaua. —^Male: Tegumen (PI. i, D) with body very short, about one-third the 
length of the limbs, which are broad, nearly straight, and almost truncate at the tip. 
Uncus broad at base but quickly narrowing, slender, and of uniform width for the rest of 
its length, the distal third dorsad thickly set with short stout spines inclined cephalad, 
interspersed with a few sparse hairs; gnathos glabrous, its limbs widely separated at 
their tips but quickly narrowing to me slender body, which considerably exceeds 
the uncus. Harpes (PI. i, B) rather narrow at base, elongate and subfalcate in general 
shape; costa free except at base but much modified into a short chitinized process, 
incurved and truncate; cucullus lightly chitinized, strongly concave, widest just 
above the base and narrowing gradually to the rather obtusely rounded tip, very hairy 
within, with an especially thick tuft just above the base. Cucullus not sharply 
separated from the sacculus. which is subquadrate in general outline, with a thickened 
costal margin and on its disk near the ventral margin a stout, heavily chitinized 
finger-like spine. The vinculum is much reduced and is merely a band of lightly 
chitinized tissue connecting the bases of the harpes. Aedoeagus (PI. i, C) lightly 
chitinized, nearly cylindrical, rounded at the base and curved in the shape of an 
old-fashioned pistol; at the tip truncate and somewhat bell-shaped, the internal lining 
for half its length roughly tuberculate; just inside the tip is a very short, sharp, chitin¬ 
ized thom-like comutus, and about two-thirds toward the base another much larger, 
acute, oblique spine with a very long narrow base, its tip inclined toward the tip of 
theaedoeag^. Anellus a mere ventral membrane. Female: Anal plate (PI. i, G) 
Fio. 2»~-Crambus praefectellus: Adult. About three times natural size. 
two-lobed, the dorsal lobe more feebly chitinized, about one-third the width of the 
lower, and separated from it by a deep notch, the margins of both lobes thickly set 
with stout setae. 
THE EGG 
As is the case with all other species of this genus so far as known, the 
eggs are dropped promiscuously by the female during the early evening 
as she flies about or stands at rest. They are dry and drop down among 
the grass stems to effectual concealment in the debris beneath. 
The incubation period has varied in the writer’s experience from 15 
days in March in Florida to 5 days in June and July in Tennessee, with all 
intermediate gradations. During the growing season from 5 to 9 days 
seems to be about the usual duration. 
Almost snow white when first laid, the egg day by day becomes first 
pink, then flesh color, salmon, and, finally, on about the fourth day, a 
bright clear coral-red. They remain thus until about 24 hours before 
hatching, when the head and cervical plate of the contained larva begin 
to darken, giving the eggs a purplish hue. The larva escapes through a 
somewhat irregularly cut hole at one side of the larger end of the egg, 
leaving the empty shell nearly transparent and slightly iridescent. ^ ^ 
The eggs of this species are somewhat rounder and with the small end 
a little more acute than the average for the genus. With this as with 
