36 
BRITISH BEETLES. 
in the male, is usually notched, or otherwise altered in 
outline and surface), and the remainder being only seen 
on the upper side. The abdomen also contains the 
greater number of spiracles, 
or breathing-holes, situated in 
a row on the upper surface of 
the sides; these spiracles, nine 
or ten in number, are placed 
as follows : — one, the largest, 
between the prothorax and 
mesothorax j another between 
the mesothorax and metathorax, 
covered in repose by the wing- 
cases, but exposed in flight ; 
a third between the metatho- 
rax and first segment of the 
abdomen, and the remainder between every two of the 
other abdominal rings, with the exception of the last 
pair. 
Fig. H. 
Under side of abdomen of 
l). marginalia. 
