92 
WAKBLES. 
up to the perfect fly, were sent me by Mr. A. C. C. Martyn, a student 
at the Eoyal Agricultural College, Cirencester, who is well qualified to 
report on the subject, as in the previous year he had succeeded in 
rearing twenty to thirty Ox Warble flies to maturity from the larval 
state. During the past summer Mr. Martyn secured various Horse 
Warble maggots, and reared two of them up to fly state, these maggots 
being taken by himself from warbles respectively in the back of a colt 
and of a cart-horse. In one of the maggots the mouth-forks were 
noticeable on microscopic examination, and were stated by Mr. Martyn 
to be very similar to those of the young Ox Warble maggot, as sketched 
at “1” in the accompanying figure, 
repeated from last year’s Warble re¬ 
port ; the existence of bands of prickles 
was also noticed. 
Of the two maggots which were 
reared to development, one was kept 
in a temperature of 100° Fahr., and 
remained in the chrysalis state for 
twenty-seven days. The fly which 
then emerged was reported by Mr. 
.Martyn to resemble the Ox Warble Fly, but to be in his opinion 
somewhat longer in shape. The fly died in two days, and shrivelled 
up. In the case of the second maggot, which was reared to develop¬ 
ment, the craving for warmth was plainly showed. The box in which 
it was secured was covered with a convex lens, and on this being 
placed out of doors the larva drew itself from the darkened corner, where 
it had been laid, into the rays of the sun. These points agree with what 
I have noticed of the Ox Warble maggot, which I have seen restored 
when seemingly dead by being held in the warm hand, and which 
have power of movement, when free from the warble, in a selected 
direction. In both the above instances the flies soon died, and 
shrivelled or putrefied, so that they could not be kept as perfect 
specimens. 
The first communication which I received regarding observation of 
the warbles was from Mr. Hy. Thompson, M.E.C.V.S., of Aspatria, 
Cumberland, who wrote to me on the 16th of April, as follows :— 
“ To-day I send you a warble maggot, taken from the neck of a 
thorough-bred horse. This is the third which I have removed during 
the last two years. The opening in the skin was about the size of a 
mustard-seed. About four hours before the animal was brought to me 
a small swelling was noticed, but to-day the swelling was diffused and 
extensive (nearly all the length of the shoulder-blade). The warble 
came away with very little pressure, but the parts were very painful. 
Mouth-forks of very young maggot 
of Ox Warble, much magnified. 
