REPORT OF ENTOMOLOGIST. 
this louse has an alternate food-plant in Colorado, at least it is con¬ 
tinuously upon apple,and pear trees from the opening of the leaves 
in spring until the eggs have been deposited in October and No¬ 
vember. 
The green plum louse, {Aphis pruni ,) the black cherry louse, 
(Myzuz cerasi ,) the boxelder louse ( Chaitophrous negiindinis ,) the 
snow-ball louse {Aphis viburni ) and the woolly louse {Schizoneura 
lanigerd) of the apple, were all of them specially abundant. The 
beet-root louse ( Tychea brevicornis ) has been reported by Mr. P. 
K. Blinn, field agent for the Station in the Arkansas Valley, as 
quite generally distributed in the beet fields in the vicinity of 
Rockyford and as attacking the roots of many weeds. He reports 
a louse that seems to be this species as very abundant and quite 
injurious to the common garden purslane. One beet field of eight 
acres near Fort Collins, investigated by Mr. Johnson, has been 
badly infested by this louse and, apparently, the crop has suffered 
considerably from it. 
A full report upon the results obtained from the use of insecti¬ 
cides for the destruction of the lice and their eggs will be given in 
a bulletin later, after farther tests have been made. I may say 
here that we seem to have been entirelv successful in destrovins: 
eggs of the lice with strong applications of kerosene emulsion, 
crude petroleum or whale-oil soap, made early in the spring. 
FALSE CHINCH-BUGS ( Ni/sius minutus and N. californicus). 
These two species of false chinch-bugs are abundant in Colo¬ 
rado and their combined attacks upon mother beets in the Arkan¬ 
sas valley make it almost impossible to grow beet seed there. Mr. 
P. K. Blinn, writing under date of June 29, [903, said he had just 
collected in one hour’s time 20 pounds of these bugs from a patch 
of mother beets by brushing the insects into a dish held in the 
hand. Mr. Blinn also reported radishes, and mustard, planted 
near the beets as trap crops, of no value as the bugs were as abun¬ 
dant on the fields of beets as on the trap crops. He also stated 
that mother beets grown in a field surrounded by oats were not in¬ 
jured by the bugs. These bugs seem partial to plants of the mus¬ 
tard and goose-foot families and I do not remember to have seen 
them attacking any of the grasses. It is possible that any of the 
grains would afford barriers that would be rather effectual in ex¬ 
cluding them. Wild mustard is a favorite food-plant for these 
false chinch-bugs. About nine-tenths of the specimens received 
from Mr. Blinn from beets were {N. minutus.) 
Some have thought these insects to be the chinch-bug of the 
prairie states farther east, but such is not the case. 
