143 
and most slender, those of the patella and tibia are comparatively 
thick (pl. IV fig. 18). While it is impossible to define these two 
extreme forms of pointed hairs sharply from each other, there is in 
Eucarus segmentatus no connecting link between ,,p0inted" and 
»fan hairs". But in Euc. Italicus as well as im Euc. Arabicus 
(pl. IV fig. 14) there are very clumsy hairs bearing a distal terminal 
hair just like many fan hairs; it is impossible to distinguish these 
hairs from the extreme forms of fan hairs; on account of their 
position these clumsy pointed hairs must be homologized with un- 
doubtedly pointed hairs in Eucarus segmentatus. 
(2). The most typical fan hairs are well articulated flat hairs, 
broader åt their tip than at their base; the distal margin is divided 
into a larger median lobe and two smaller lateral lobes; the median 
one often bears a small pointed ,hair". They are provided with 
" chitinous lines, single at the base but divided. distally. These 
håirs, gradually merging into hairs four to five times as long, 
are broad at their tip (pl. IV fig. 12 & 13), straight or curved. 
Especially in Eucarus Arabicus there are hairs the distal margin 
of which is divided into many fine spines (pl. IV. fig. 18); The 
three lobes are not always placed at the same level; in some 
hairs the lateral ones are bent more or less inwards. The fan hairs 
røesemble the hairs of Cheyletus ornatus C. et F. as shown in Ber- 
lese's paper (1 Tab. 130). 
(3). Along the dorsal side of the metatarsus of the second, 
third and fourth pair of legs and at the outer side of the fourth 
pair of femurs there are placed some hairs which are very similar 
to the tactile hairs of other Arachnids (pl. IV fig. 12). These hairs 
are very thin, strongly curved and placed in deep and large articula- 
tion-cavities. I name these hairs sense /Aairs. 
3. The Mouth Organs and the Antennae etc. 
A. Pseudocapitulum (Tab. IV fig. 3, 4 & 5). 
General Remarks. The different authors do not agree with 
each other with regard to the interpretation of the mouth parts in 
