4 
48 
power of lashing them off with the tail. Sometimes horses, also, 
are attacked by the Gad-Fly, and I have been witness to four or 
five instances of these larvm being found beneath the skin of the 
horse, the parent Fly, driven perhaps by necessity and the want 
of proper opportunity of depositing it among the cattle : whe¬ 
ther they ever arrive at maturity in these cases I am not assured. 
The larvffi of the Cuticolar Oestri are very unlike the Gastric 
larvre, so much so, that I could hardly imagine that they would 
produce an Oestrus till I actually procured the Fly from it. 
Removed from the abscess this larva is found of an oblong 
figure, larger at one extremity than the other, which larger end is 
placed upwards in the abscess, has the respiratory plate, and is 
applied to the external opening of the abscess. The body of the 
larva is divided into ten or eleven segments or sacculi by trans¬ 
verse bands ; these are crossed again or intersected on the sides 
by six longitudinal lines, pursing up the skin, and forming the 
sides of the larvm into so many papillae or nipples, each possess¬ 
ing at its extremity a respiratory pore. See Plate II. fig. 3. 
These larvae have not the long acula upon the edges of the 
segments, as in the Horse-Bot; but they have an apparatus 
which serves much the same purpose, but in a milder degree, for 
there are observable on a more close inspection, ridges of dotted 
prominent lines passing transversely round the body of each seg¬ 
ment, and interrupted irregularly by the longitudinal lines above 
described, leaving smooth intervals between them : of these 
there are two kinds, a narrower and a broader line of minute dots 
or points ; the first, or narrower line, is easily seen by using a 
lens to be formed of hooks bent upwards or towards the tail of 
the insect. See fig. 3. a. And on examining the broader lines, 
consisting of smaller dots, fig. 3. b. with a powerful magnifier, 
they also may be seen to consist of hooks, but smaller, and 
turned in the opposite direction, or downwards in the abscess, 
and towards the head of the insect. It is probable, by means of 
