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air within them in such a way that they are easily 
followed. In Phal. propinguum I have found that from 
this distal spiracle proceeds an independent tracheal 
trunk strongly narrowed at the spiracle and shortly 
after becoming very wide, running to the apex of the 
tibia, and not far from the origin it sends forth 2 large 
branches, the narrower of which is recurrent and 
dissolving little by little towards the middle of the tibia 
into finer branches; the other is somewhat wider, at 
first running laterally, but not far from the spiracle it 
is (according to the examination of preparations cleaned 
in caustic potash) connected by a very narrow 
and exceedingly short lateral branch with the 
one of the 2 main trunks which (fig. 2, k) is 
not connected with the proximal spiracle. | 
have had no difficulty in following the 2 trunks through 
the tibia, a fact I wish to point out, on account of the 
remark above. 
Of the 2 spiracles the proximal one is almost al- 
ways found at the same place, while the distal one is 
-a little moved in the different genera of the fam. 
Phalangioidcee W. Sor. It may immediately be stated 
that the size and structure of the spiracles, besides the 
distance of the distal spiracles from the apex of tibia, 
is almost equal on all 4 pairs of legs of the same 
specimen. Tab. IV, fig. 1 gives an exhibition of their 
position in Phal. propinguum Luc. and the Danish 
species, Ph. cornutum L. and Ph. parietinum De Geer. 
An almost similar position I have found in Phatybunus 
corniger Herm., Mitopus morio Fabr., a species of the 
genus Zgeenus, even by the rather short-legged Acantholo- 
phus ephippiatus C. Koch. In Liobunum rotundum Latr., 
an East-Indian species of the genus Gagrella and in 
Pantopsalis Listeri White the distal spiracle is some- 
what longer removed from the apex of tibia. 
