
























66 THE INSECT WORLD. 
piece, which the tly gets rid of when it is in a fit state to come 
into the open air.’ 
Fig. 47, taken from drawings in Réaumutr’s 
memoirs, represents the imago of the Gistrus leay- 

ing the cocoon. 
The reader is, most likely, desirous to know) 
with the aid of what instrument the Cistrus ig 
able to pierce the thick skin of the ox. 
The female only is possessed of this instr 
ment, which is situated in the posterior ex:| 
tremity of the body. It is of a shiny blackiall 
brown colour, and as it were covered with scala 
: By pressing the abdomen of the fly between! 
Fic. 47.—Imago of One's two fingers it is thrust out. Reaumur 
Bot-fly emerging. — observed that it was formed of four tubes, which 
could be drawn the one into the other, like the tubes of a telescope 
(Fig. 48). The last of these appears to terminate in five small 
scaly knobs, which are not placed on the same line, 
y. but are the ends of five different parts. Three a 
| these knobs are furnished with points, which form an 
instrument well fitted to operate upon a hard thick 
skin. United together, they form a cavity simiai 
EG to that of an auger, and terminating in the tommy 
“=a of a spoon. 
The gad-fly or breeze-fly of the sheep ( Cophaicall 
(Ciustrus) ovis) has obtained notoriety on account of itt 
attacking those animals. 
nto Even at the sight of this insect the sheep feels the 
positor i the greatest terror. As soon as one of them appears; the 
(Gisirus bovis) flock becomes disturbed, the sheep that is attacked 
shakes its head when it feels the fly on its nostril, and at the 
same time strikes the ground violently with its fore-feet ; it ther 
commences to run here and there, holding its nose near the ground, 
smelling the grass, and looking about anxiously to see if it is still 
pursued. : 
It is to avoid the attacks of the Cephalemia that during the 
hot days of summer sheep lie down with their nostrils buried 
dusty ruts, or stand up with their heads lowered between thei 
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