181 
characters for groups of genera may be found by the 
study of the apical portion of the palpi on a large 
material. 
Of other sense-organs we only know the eyes and 
»les raquettes coxales« (see Gaubert op. cit. p. 96—98), 
3 pairs of which are found in Zombis Sim. and 5 pairs 
in all the other genera. It may be noticed about the 
eyes that in animals preserved in spirit the cornea is 
very often closely studded with small, irregular depres- 
sions which probably are owing to contraction and 
suggest a peculiar structure, differing from that in the 
other Arachnids. 
C. Respiratory Organs. 
L. Dufour states (op. cit. p. 404—7) that Galeodes 
possesses 1 pair of spiracles on the thorax and 2 pairs 
on the abdomen, respectively at the posterior margin of 
the 2d and 3d sternite. Subsequently this number, found 
by Dufour, is always reprinted in the literature, also 
of Pocock (op. cit. p. 8 and p. 16) in the year 1898. 
The statement, however, is defective, as a much 
smaller, unpaired spiracle is found in the 
median line at the posterior margin of the 4th 
sternite; that is already discovered by Kittary (op. 
cit. p. 843 and 345), but Dufour denies its existence. I 
have examined the spiracles of the abdomen, and the 
basal portions of its tracheal trunks in Cleobis Cube, 
Galeodes ortentalis, Solpuga fatalis and Rhax annu- 
lata? in the following simple manner. The dorsal half 
of the abdomen is removed with a pair of scissors, the 
ventral side put into a strong solution of caustic potash, 
and 24 hours later all the bowels can be easily removed 
and nothing is left but the ventral integument and the 
trachee. Thus in all 4 forms I found a rather small 
