7 
in from four to seven or more days, when the minute larvie or cater- 
pillars burrow into the kernels and feed on the starchy interior. <A 
single larva inhabits a grain of the smaller cere- 
als, but maize affords sustenance for two or more 
individuals. A kernel of corn opened to show 
the larva at work is reproduced at fig. 2, b, and 
; an ear of infested pop-corn is Shown at fig. 3. In 
three weeks or more, according to season, the 
caterpillar attains maturity, when it spins within 
the kernel a thin, silken cocoon and transforms 
to a pupa or chrysalis, the moth emerging a few 
days later, the entire period from egg to adult em- 
bracing in summer time about five weeks and in 
colder weather considerably longer. After copu- 
lation, the moth deposits eggs for another brood, 
and thus several generations are produced in the 
course of a year. The older writers state that 
the species is double-brooded, but as it breeds 
continuously in harvested grain, there is now, as 
in the case of most indoor insects, an irregular 
development, influenced by temperature. Inthe 
latitude of the District of Columbia, in an out- 
door exposure, such as is afforded by an old-fash- 
ioned cornerib, there are probably not more than 
four broods, the insect hibernating as larva in 
the grain, but in a heated atmosphere we have 
the possibility of five or six generations annually. 
In the warmer climate of the South, where the 
insect ean breed uninterruptedly throughout the 
winter, it has been estimated that as many as 
eight generations may be produced. 

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THE WOLF MOTH (Tinea granella Linn.). 
The wolf, or little grain moth, does consider- 
able injury to stored cereals in Kurope, but as it 
is not particularly destructive in America, re- 
quires only passing mention. This species is of 
about the size of the Angoumois moth, creamy 
white in color, thickly mottled with brown. Like 
the latter, it is known to oviposit in grain in the 
field. Itinfests cereals of all sorts, and a single 4,4. 3 Kar of pop-corn show- 
caterpillar is capable of great damage, as it has ing work of Angoumois grain 
a habit of passing from one grain to another, ™°t» (from Riley in Ann. 
spinning them together with its webs as it goes, jg eee 
until twenty or thirty grains are spoiled. When full grown the cater- 
pillars crawl all about the infested mass, leaving their webs everywhere, 
thus injuring even more than they consume. 
wis 

