SOM 7 
beets were planted in an orchard. August 16 the worms were pupating 
rapidly, about an inch below the surface of the ground, though there 
were many very young larve still on the beets. September 10 the 
moths were hatching in great numbers, and there were still scattering 
caterpillars on the beets. As mature ova could not be found in the 
female moths at this time, and no more larve appeared, it seems 
probable that the moths hibernate during winter. The sudden appear- 
ance of this insect in such numbers is almost unaccountable. For 
several years a few parties had been growing beets, in an experimental 
way, about Grand Junction, but no caterpillars had ever been seen 
before, so far as I was able to learn. Last year a sugar factory was 
erected, and a large acreage of beets was grown for the first time in 
that region. At Delta, a town 50 miles distant by rail, and at Mont- 
rose, 70 miles distant, where beets were also grown, the caterpillars 
appeared in considerable numbers, but were not so numerous as near 
Grand Junction. The larve were also sent me from Rockyford, where 
they were common on experimental beets, but not numerous enough 
to attract much attention." 
The Arkansas Valley forms a sort of thoroughfare through which 
insect pests have come to Colorado from the East. It was here we 
first found the strawberry leaf-roller, Phovopteris comptana, which is 
established as a serious pest on both slopes of the Rockies in limited 
localities. The cucumber beetle, Diabrotica vittata, is a recognized 
pest upon melon vines about Rockyford, but seems to have done no 
special harm in other localities, and the melon louse, now generally 
distributed over the State, seems to have reached us by the same 
route. Other insect enemies deserve mention, but I refrain from 
occupying more of your time. 
NOTES ON INSECTS OF ECONOMIC IMPORTANCE FOR 1900. 
By W. G. Jounson, College Park, Md. 
~ The apple aphis, Ap/hds mali Fab., has been unusually abundant on 
apples this year. It was the first pest of any consequence that occa- 
sioned much correspondence. Twigs entirely incrusted with eggs of 
this species were frequently sent to the office during the fall and 
winter. The attack this spring was very general, especially in young 
orchards. Jalso found the same insect very common upon Kieffer 
pears in many places. The injury to apples has been very great. 
The apple-tree tent caterpillar, Clistocampa americana Harr., ap- 
peared this spring on apples in all sections of the State. Many trees 
were entirely defoliated. In one instance I found a nest in’a peach 
'T have just received a letter from my assistant, Mr. E. D. Ball, bearing date of 
June 17, in which he states that the beet caterpillars have been hatching for a week 
at Rockyford, and that in some fields the beets are half eaten up now, 
