6 
living maggots from a Flv,* and Dr. Brauer pointed out that the 
genus is one which deposits its young alive, t 
In their first stage the little lame or maggots are hardly as 
much as the twelfth of an inch in length, white, semi-transparent, 
and long in shape. As they grow they alter both in shape and 
colour. This gradually changes to a yellowish tint, and marked 
across with a dark transverse streak on the segments, excepting on 
the first and last; beneath, each segment, from the third, has the 
front border furnished with spine-like tubercles. At maturity they 
are about an inch (rather more or less, as the case may be) in 
length, and rather less than a third of an inch in width; the under 
surface flat; the back very convex or arched, and the general shape 
of a very long oval, or rather the sides parallel, with the head end 
prolonged, the tail end obtuse. One very important point in the 
structure is the presence of two dark brown hooks at the head end 
(see fig.). Between these is a little depression showing all that 
the maggot possesses by way of a mouth. The last segment at the 
tail extremity of the maggot is truncated upwards, with a circular 
margin projecting over the breathing pores, and a lip below bearing 
small spines. 
By the help respectively of the head hooks, and of the spines 
at the end of the abdomen, the maggot is enabled to pull itself 
forward, and keep itself in place, and likewise to push itself 
onwards wherever there is space for it to pass along. 
The young maggots on being deposited fasten themselves by 
means of their head hooks, and then travel up the nostrils, and 
proceed at will into any of the attainable cavities, in some of 
which they thrive, come to maturity, and from thence make their 
escape in due time ; from others, on the contrary, which they have 
reached when small themselves, through small orifices, they are 
unable when full grown to make their way out, and perish, but they 
in no case make their ivay into the brain. They “ never do, and never 
can, penetrate into the brain." f 
In the paper on this attack, referred to below,§ it is mentioned 
that where “the larvae are very numerous . . . they may be 
encountered in the larynx and trachea, where they had probably 
wandered after the death of their host.” Of this straying about I 
* ‘ Insects of Missouri,’ First Annual Beport, 1868, p. 165. 
f Brauer, 1 Monographie der CEstriden,’ p. 154. 
I See ‘Animal Parasites of Sheep,’ by Cooper Curtice, D.V.S., M.D., U.S.A. 
Department of Agriculture, Bureau of Animal Industry, p. 29. Washington. 
§ See ‘Parasites and Parasitic Diseases of Domesticated Animals,’ by 
Prof. L. G. Neumann ; translated by Dr. Fleming, p. 571. 
