30 Farmers’ Bulletin 1260. 
ceptacle that holds the infested 
material. Both larve and beetles 
feed to some extent on other grain-. 
infesting insects, hence are partly 
predacious. 
SAW-TOOTHED GRAIN BEETLE.” 
The saw-toothed grain beetle 
gains its name from the peculiar 
structure of the thorax, which 
bears six sawtoothlike projections 
on each side (fig. 40). This char- 
acter is a ready means of dis- 
‘inguishing this beetle from others 
that infest stored grain. It is 
about one-tenth of an inch long, 
slender, much flattened, and dark 
IG, 36.—The cadelle: Adult beetle. The Chocolate brown in color. A cos- 
cadelle is a flattened, black beetle mopolitan beetle, extremely abun- 
Wiehe EWS 3 ae Ra dant at times, it is nearly omniv- 
orous, infesting grains, flours, meals, dried 
fruits, seeds, etc. Both beetle and larva are 
very active. 
The small slender eggs hatch in a few days. 
The emerging larve do not spend their lives 
within a single grain but crawl about ac- 
tively, feeding here and there. When full 
grown (fig. 40), they are whitish, with dark 
markings, somewhat flattened in form, and 
have three pairs of legs and an abdominal 
proleg. When ready to pupate they con- 
struct delicate cocoon-like coverings by join- 
ing together small grains or fragments of 
foodstuffs with a sticky secretion and within 
this the pupa (fig. 40) and later the adult 
form are assumed. Development from eg 
oO 
oS 
to adult may take place in 24 days in summer. 
SQUARE-NECKED GRAIN BEETLE.” 
Fie. 37.—The cadelle: Larva. 
Commonly found crawling 
The square-necked grain beetle is closely 
related to the saw-toothed grain beetle, which AONE 2ee eee 
5 32 ae i , Z may appear glistening 
it greatly resembles in form, size, and color. white or dull and powd- 
Tt is’ a flattened, oblong, \polished, reddish — “%e@-#eturaing (i 2S ae, 
5) ‘ : terial imsiwhich wees 
brown beetle about one-tenth of an inch long. erawling. When full 
a: eee pet ce , grown it is about three- 
It differs from the saw-toothed grain beetle fourths of an inch long. 
ne eS) eS 
18 Oryzaephilus surinamensis L. 20 Silvanus gemellatus Duy. 
