23S 
anatomy of the mole^cricket. 
less extent than the preceding, is situated immediately behind 
the foot of the middle leg ; the third, which is still less than 
the second, is situated immediately behind the root of the 
posterior leg ; near the termination of the dorsal part of the 
third abdominal segment ; the fourth, fifth, and onwards to 
the tenth inclusive, are situated near, the terminations of the 
corresponding dorsal segments of the abdomen. 
I would here notice by the way, a peculiar appearance very 
constantly observable on the ventral surfaces of most of the 
abdominal segments between the hind pair of legs and the 
caudal antennae. At either extremity of those segments there 
is a short line, not unlike that made by the stroke of a pen, 
passing obliquely downwards and inwards : it dees not seem 
easy to conjecture the use of these lines. 
I may state from repeated observations, that the stigmata, 
taken generally, are not the terminations of single tubes ; 
very frequently two and often more than two tracheae origi- 
nate from the same stigma ; and very soon after the com- 
mencent, one or even two of these tracheae subdivide into 
numerous branches, which follow as nearly as may be the 
direction of the original tubes. 
The distribution of many of the tracheae may be very satis- 
factorily demonstrated by drying one of the insects under an 
exhausted receiver, containing muriate of lime : for after hav- 
ing been thus dried, the tracheae become perceptible to the 
naked eye through the sustance of the integuments. The fore- 
going method of drying anatomical preparations may be suc- 
c(Jssfullyemployedon many occasions ; it answers particularly 
in the case of the human eye, or the eye of any sufficiently 
large animal ; for, in the act of exhaustion, the air contained 
