INJURIOUS INSECTS OF I909 AND IQIO. 81 
gation. Pyrethrum placed in a pan on a hot stove and allowed to 
smolder but not break into flame, will stupefy, if the room is tightly 
closed, all the flies therein, which should be carefully swept up after- 
ward and burned, otherwise some will revive. Pyrethrum or Per- 
sian insect-powder loses its strength upon being kept; and in buying 
one should be particular to get fresh powder, or what has been kept 
in tightly sealed receptacles. 
The House Fly is a menace to the health of your children and 
yourself. Its new name—‘‘Typhoid Fly,’’ is significant! 
Gee CLOLHES MOTEL 
There are two species ot 
“= clothes moth common in dtf- 
—<«* ferent parts of the United 
Ia pe States, but we have come in 
nny ee - : ; 
ae (a contact with only one in Min- 
ql eae ea iesota, namely, Tineola bisel- 
liella. This pale yellowish 
getiiita and Tava on “worm,” wonlarged. moth is about a quarter of an 
with wings spread. After Riley. inch long, and its larva at- 
tacks not only woolens and 
furs, but also feathers. The writer has observed the moth flying in 
his residence as early as March 6th. It undoubtedly lays its eggs 
prior to that date, since full grown larvae were found on March 16th. 
The egg is visible to the naked eye, and can be dislodged by shaking 
or brushing the cloth or fur in which it is found. Eggs kept under 
observation in our laboratory, hatched in six and seven days, one 
female laying several eggs. One of these eggs measured under the 
microscope was found to be .o2 of an inch long by .o1 of an inch 
wide, of a pearly-white color. The young worm, or larva shown in 
Fig. 35, was one-twentieth of an inch long when about twenty-four 
hours old. 
A. S 
NH 
A QANHO9eyy 
This is a very troublesome pest in Minnesota, as all house- 
keepers know. It is well to remember that camphor, naphthaline, 
moth balls, etc., kill neither the insect nor its eggs, but act merely 
as repellents. Further, storing furs and woolens in a chest, cedar or 
otherwise, the odor of which may be repulsive to the insect, would 
be of no avail if there were eggs or larvae of this moth in the 
