DIPTERA. 139 
REMEDIES. 
While the ticks may be greatly lessened in number by the vigorous 
use of pyrethrum—a most available remedy during winter—the most 
practical plan to adopt, and one which if thoroughly followed will make 
all others unnecessary, is to dip the sheep each year after shearing. 
Of the numerous dips which are in use, and which are discussed 
more fully in the chapter on remedies, the kerosene emulsion is recom- 
mended for this form, and several of the patented dips on the market 
are gcod, while tobacco dips, tar dips, etc., may be used, if preferred. ' 
It is of course desirable to use a dip that will eftectually destroy not 
only these ticks but the two forms of lice and the scab mites, in 
case any of these are present. A dipping tank is an essential part of 
the equipment for sheep raising, and its construction is described in the 
chapter on remedies. 
A flock once freed from the pests will not be again infested except by 
the introduction of infested animals; hence care should be taken in 
making additions to the flock to free the newcomers from parasites. 
It is also well to keep the sheep fora few days after dipping in a differ- 
ent inclosure from what they occupied before, to avoid possible infes- 
tation from any stragglers that may have been caught on wool upon 
posts or brush, and if the wool is charged with them when clipped it 
i" ‘Should be stored where the ticks could not easily return to the sheep. 
4 The ticks can not travel any distance independently, and will soon die 
a when removed from the sheep, but proper care here will assure success. 
4 With due care to have an efficient dip one operation should suffice, but 
F it is a good plan to examine the herd a week or ten days after dipping, 
and if any parasites are found to have escaped, or to have issued from 
pup that survived, to repeat the operation. 
A BAT HIPPOBOSCITD. 
Under the title of ‘‘ A remarkable new hippoboscid from Mexico,” 
Mr. C. H. T. Townsend describes a species which he names Trichobius 
dugesit and which he received from Dr. Dugés, of Guanajuato, Mexico, 
taken from a bat, Glossophaga soricina. (Entom. News, Vol. LI, pp. 
105-106, 1891.) 
