LICE AFFECTING DOMESTIC ANIMALS. 
207 
usually to deal with dead and preserved individuals in which 
this structure would almost certainly escape notice. 
The eggs are one millimeter and a half in length (.06 in.) 
by three-fourths of a millimeter in width (.03 in.). They are 
light yellow or dusky whitish in color, and taper slightly to 
the point of attachment. The circular lid-like portion is 
large, occupying nearly alt the surface of the free end of the 
egg. They are attached usually near the base of the hairs. 
On account of the thinness of the hair, the application of 
remedies, where necessary, is quite easy. Washes of tobacco 
water or dilute carbolic acid, and the application of kerosene 
in lard, or kerosene emulsion by means of force pump, sul¬ 
phur ointment, etc., are recommended. The application of 
fine dust may be provided for naturally by allowing the hogs 
a chance to roll in the roadway or any place well supplied 
with fine dust. Where this is impracticable, the dust, ashes, 
or powdered charcoal may be applied directly to the neck 
and back of the infested animal. The species is not known 
to attack any other of the domestic animals, and hence no 
precautionary measures in this direction .are necessary. 
The Sucking Horse Louse. (Plate I., Fig. 4.) 
Hcematopinus asini, Linn. —macrocephalus , Burm. 
This species was figured by Redi (Exp., PI. xxii., Fig. 1) 
and was described by Linngeus under the name of Pedtculus 
asini , presumably his specimens being taken from the ass. 
Later Burmeister described specimens from the horse under 
the name of Pediculus macrocephalus. Denny retains the name 
given by Linnaeus and states that it is common upon the ass, 
and that he also had specimens from the horse, from which 
circumstance he suspected Burmeister’s macrocephalus to be 
the same. Giebel and Piaget both follow the name of Bur¬ 
meister, and Piaget separates as a variety the form occurring 
on the ass, and gives it the name of colorata. 
It seems hardly probable that it occurs in this country in 
sufficient numbers to cause much trouble on horses. Possibly 
examination of mules, asses, or donkeys would show greater 
abundance from the fact that horses in general are more care- 
