












— 

64 THE INSECT WORLD. | 
may be seen an elevation, a sort of tumour, a bump, as Réaumu 
calls it, comparing it more or less justly to the bump cause 
on a man’s head by a severe blow. 
Tig.46, taken from a drawing in Réaumur’s memoirs, represent, 
the bumps of which we speak. 
The country people are well aware of the nature and cause o 
these bumps. They know that each one contains a worm, thai 
SERN 
SSSA 
SS 
SS 
SS Ny 
AQ 
S&S 
SS y 
\ NY 
SQN : 

2S NS 
SSSSSSSTSEs S 
SSR ASRS 
SAS We 
\ Ww ANN 
~ SRV Ni 

Fig. 46.—Bumps produced on cattle by the larvee of the Bot-tly. 
this worm comes from a fly, and that later it will be transformed. 
into a fly itself. Each of these bumps has in its interior a cavity, | 
occupied by the larva, which, as well as the bump, increases in | 
size as the larva becomes developed. 
It is generally on young cows or young bullocks—in fact, on 
cattle of from two to three years of age—that these tumours exist, | 
and they are rarely to be seen on old animals. The fly, which by | 
piercing the skin occasions these tumours, alw 
whose skin offers little resistance. 
a small opening by w 
ays chooses those 
Each tumour is provided with 
hich the larva breathes, 

