15 
strong, swift flier, and is virtually certain to occupy the whole 
country in due time, and it is further particularly likely to be in- 
troduced into the state direct from its European habitat on nursery 
stock imported from France. It winters in the caterpillar stage 
partly grown, hundreds of young collecting in single colonies on the 
trees, where they hibernate in closely webbed nests (Fig. 12). Hun- 
dreds of these nests containing living young were sent, in 1909, in- 
Fig. 13. Brown-tail Moth, Euproctis chrysorrhKa, winter nests. Natural 
size. (Connecticut Experiment Station.) 
to Illinois from France, and only the most active and fortunate in- 
spection work prevented their escape in this state that winter. Worse 
than this, however, infested cases of nursery stock originating in 
France were reshipped into Illinois from other states where the 
force of inspectors was not sufficient to deal with the shipments 
arriving, and danger from these sources will continue year after 
year unless other states strengthen their inspection systems. Fur- 
thermore, since stock received in Iowa was shipped to this state 
that winter bearing living brown-tail caterpillars, it is extremely 
likely that the part retained in Iowa was similarly infested and 
that the brown-tail has thus obtained a lodgment there and possibly 
in other states adjacent to Illinois. If this is the case it will pres- 
ently spread to our state also, especially as the moth flies long dis- 
tances before the prevailing winds. It is important, for these rea- 
