-93- 
An improved and inexpensive dip that con be prepared on the farm 
or range was made in 1943 by adding 4 to 6 ounces of cube powder to 
each 100 gallons of water. With nearly 10,000 farm and range sheep 
that were dipped in Colorado and New Mexico during 1944, a single 
dipping destroyed all ticks in a relatively short time. The dip ma- 
terial apparently remained in the fleeces of dipped sheep long enough 
to destroy any young ticks that developed from the live pupae re- 
maining in the wool after dipping. The cost of this home-made dip 
is only 10 to 20 percent of that charged for commercially prepared 
dips. The use of this dip was one of the high lights of the year's 
scientific work,— U. S, Bureau of Animal Industry (614 ), 
Pseudolynchia canariensis (Macq,), the pigeon fly 
One of the most easily applied and effective treatments for 
squabs is fresh pyrethrum powder. From 1 to 3 pinches dusted in the 
feather tufts will kill all flies present, Derris or cube powder 
(3 to 5 percent of rotenone) is nearly as effective as pyrethrum and 
should be used in the same way, but these powders are less effective 
on grown pigeons,— Bishopp (53), and U. S. Bureau of Entomology and 
Plant Quarantine ( 627 , p.24)T~ 
Hypodermatidae 
Hypoderma aeratum Aust, 
In Cyprus dressing the warbles on goats with derris preparations 
gave satisfactory results,~Roe (511 ) , 
Hypoderma bovis (Deg,), the northern cattle grub 
Hypoderma lineatum (De Vil,)„ the common cattle grub 
In Cyprus dressing the warbles with a derris preparation was 
found to be a cheap and effective means of destroying the larvae of 
both species. Arrangements were made in 1937 to treat large numbers 
of cattle in different parts of the colony. In 1938 investigations 
indicated the advisability of treating all cattle in an endeavor to 
eradicate theso flies from the island. The government approved a 3- 
year scheme that entailed the examination of all bovines once a 
month from December to April and the application of a derris prepa- 
ration to every warble that could be seen or felt. — Roe (511 , 512 ) . 
In Germany the best insecticide for both species was a suspen- 
sion of derris in soap solution which kills the larvae at any stage 
