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spiracle in the membrane between the 4th and 5th 
sternite, now quite back at the anterior margin of the 
5th sternite (Galeodes, Solpuga, Cleobis), now nearer 
to the 4th than to the 5th sternite (Rhax). From the 
spiracle issues an unpaired, rather slender tracheal 
trunk, as a rule splitting itself shortly after into 2 
branches, each of which is as wide as the main-trunk. 
In Cleobis only I have found a longer main-trunk, that 
even was broken off before its division. 
The 2 anterior pairs of abdominal spiracles are 
uniformly constructed in the same animal, but present 
some differences in the 4 genera. 
In Galeodes orientalis the 2d and 3d sternite are 
hardly bipartited along the median line, their posterior 
margin is slightly projecting at the middle where 
it is ending in the well known combs. The spiracles 
are lying like longitudinal fissures, at a very 
little distance from each other, almost in the middle of 
the membrane between 2 sternites, they are diverging 
only a little from in front backwards. 
In Rhax annulata? the 2d and 3d sternite are 
very distinctly bipartite in the median line; posteriorly 
the median, thin integument gets little by little broad 
and is even folded up under the posteriorly broadly 
rounded corners of the 2 halves of the sternite, so that 
2 oblique folds arise, at the bottom of which the large, 
oblique spiracles are found. These are thus placed in 
a considerable distance from each other under the before 
mentioned submedian corners and are strongly diverging 
in the direction from in front backwards. 
Solpuga fatalis is about of the same structure as 
FRhax. The 2 sternites are visibly divided in the median 
line, and the integument, uniting the 2 halves of the 
same sternite, is posteriorly widely expanded and makes 
a smaller, triangular compartment, but the rather oblique 
