76 
time than was the case in 1898, and the createst distribution has been 
in this direction. Taking the areas of the towns found to be infested 
from year to year, we have the following table: 
Area infested, fall of— Square miles. 
Bo}? |) ee Pen e mr eieree cs SEE ee oe 29 
ASOT ole ee oly ie IE i aA eps ra ee ee 158 
1 ooo Pape ae eee et ye ey ay ne SOS ee 448 
DP BOD 2 chs die My ohare eee Oe ipa eee ee 928 
While the moth was not discovered in Massachusetts until May, 
1897, we were able to determine the area occupied in 1896, since this 
area of necessity was the same as that in which the hibernated cater- 
pillars were found in the spring of 1897. For the same reason it is 
not possible to give the area occupied in 1900 until a fall examination 
is made. 
It is interesting to note that the fall inspection of 1899 showed the 
presence of the moth at Seabrook, N. H., some 40 miles from the point 
of its introduction. Since it has now passed beyond the borders of the 
State of Massachusetts, any legislation looking to the control of the 
insect would involve cooperation of Massachusetts and New Hamp- 
shire. Indeed, Maine should be added to the list, for a small colony 
of the pest was located at South Berwick, Me., by Prof. F. L. Harvey, 
as described in Bulletin No. 61 of the Maine Agricultural Experiment 
Station. Infestation at this point was doubtless due to the transporta- 
tion of household goods from a badly infested estate in Somerville, 
Mass., at the height of the 1897 outbreak. 
ENTOMOLOGICAL NOTES FROM COLORADO. 
By CLARENCE P. GILLETTE, Fort Collins, Colo. 
Colorado is of peculiar interest from an entomological standpoint. 
The Great American Desert lying along her eastern border shuts out 
avery large proportion of the fauna of the Middle and Eastern States. 
The mountains and barren wastes beyond her western border keep 
back most of the fauna of the Pacific States, and the backbone of the 
continent rising to more than 14,000 feet in places and extending north 
and south forms an almost complete barrier to the intermingling of 
eastern and western species within the State, except in case of those 
which follow in the wake of civilization and which are transported by 
man from place to place. The insect fauna, because of the barrenness 
of a large portion of Colorado, is small in individuais, while the num- 
ber of species, because of the great variation in climatic conditions 
and in plant life, is very high. 
These barriers to the migration of insects have been of great service 
to the people, for many of the pests that are common through the 
Eastern States have not yet reached us. In some instances this isola- 
