146 
but slightly touched with »un pinceau trés fin«, the 
animal immediately draws back the leg, while it remains 
imperceptible if you »promene le pinceau sur le reste 
du corps.« »Dureste, les poils du Scorpion sont presque 
tous sensitifs, et se trouvent que sur les appendices; 
le reste du corps en est totalement depourvu«. 
To begin with, this last observation cannot be 
applied to all Scorpions, for in Pandinus cyaneus f. ex. 
we meet with well developed setiform hairs on the 
front margin and the anterior part of the lateral margin 
of cephalothorax, on the sides of the 5 hindmost abdo- 
minal segments and on all segments of the tail. His 
remarks on the occurrence of »les poils du Scorpion« 
strike me as rather general; he ought to have accented 
that he was speaking of B. australis, and that his 
observations did not concern the order of the Scorpiones, 
but this is neglected, following the example of so many j 
anatomists. — Secondly, I do not doubt that the men- 
tioned hairs on the last but one joint of the legs åre 
sensitive (they are, however, not ranged in 2 rows, as 
only one dorsal row is long and regular, while the other 
setæ are dispersed in several, chiefly ventral, less regular 
and shorter rows); but it is not possible to me to 
discover the slightest difference between these setæ and 
those found on the other joints of the legs, neither in 
shape nor in insertion: they all appear to me quite 
simple, rather long setæ. It is very probably that all 
such setae are more sensitive to a slight touching than 
the naked, thick dorsal skin of the animal, asthe chitine 
is perforated at their insertion, but they can hardly be 
called »tactile hairs«. Thirdly, there is found on the 
large chelæ and on the 4th joint of the maxillary palpi 
of Andr. australis (the maxilla as usual counted as 
first joint) quite differently shaped and inserted hairs, 
most like those, which later on in this treatise are 
