15 
of the head and thorax is a light brown approaching to yellowish, 
with touches of bright chestnut on the head and legs and margins of 
the thorax, also touches of dark brown on these parts, more particu- 
larly on the dorsal portion of the thorax. Theabdomen in fresh speci- 
mens has a general bluish aspect, not so noticeable in preserved spec- 
imens, besides its color depends evidently in large degree upon its con- 
tents. Denny says “ grayish-white or ochraceous gray,” which would 
apply well to preserved specimens, but his plate shows it a blue-gray. 
Harker says brownish gray. It appears tous that the term used by Mr. 
Tenney, blue slate-colored, comes quite as near describing the average 
appearance as any that we haveseen. The tubercles at the side of the 
abdomen and the chitinous plates are chestnut-colored, while the most 
of the upper surface of the terminal segment in the female and the ven- 
tral stripe in the male are black. 
The females deposit their eggs on the hair, attaching them very near 
the skin. Fig. 6, e represents one of the eggs, showing its attachment 
to the hair and the distance from the root of the hair in the specimen 
drawn. The adhesive substance evidently invests the egg during 
oviposition and is touched to the hair, the egg then slightly drawn 
along so as to leave th e glue-like mass to form a firm union around the 
hair and to the egg. The egg is elongate-oval, tapering at the lower 
end, and having a cap-like covering at the upper end. The surface is 
set with very minute points just visible under an inch objective, but 
showing clearly with a power of 300 diameters. At the surface no con- 
nection is to be seen between different points, but focusing a little below 
the surface brings into view what appear to be minute threads or chan- 
nels running from point to point and giving a reticulate appearance to 
theeggshell. The points can not correspond to the circular bodies repre- 
sented in Denny’s figure (E, Plate xxv, Monog. Anop. Brit.) which have 
much more the appearance of protoplasmic granules of the egg contents. 
The shape of the egg in his figure is also entirely different from that of 
the specimen from which our figure is drawn. 
The young louse escapes from the outer or unattached end, whether 
by pushing off the cap-like portion or by simply pushing through this 
portion which appears to be thinner than the rest and may be simply 
membranous, is not, so far as we know, determined. No marked 
changes, except in size and the development of the chitinous patches, 
occur from hatching to maturity. 
This is one of the most difficult parasites to destroy, and once settled 
upon an animal should receive prompt and thorough treatment. The 
main reliance of veterinarians seems to be stavesacre, and this can 
doubtless be depended upon to accomplish the desired end. Mr. Tenney 
recommends the seed of common larkspur steeped, and the animal 
thoroughly washed with the liquid. He says: “I have known one ap- 
plication to destroy every insect and egg; two will suffice if done 
thoroughly.” Of course this and the stavesacre are nearly identical, 
