140 
Russian zoologist J. Wagner (19 pag. 149) has examined the em- 
bryo of Ixodes and found that the abdomen is segmented. 'The 
larval forms of Bhyncolophus K. have according to Berlese's drawings 
a segmented abdomen (1 Tab. X). It is thus evident that Acari 
with a segmented abdomen are not unknown even if such a great 
number of segments as in Eucarus have never been found. 
On the ventral side (pl. IV fig. 3) it is quite impossible to 
distinguish the abdomen from the cephalothorax, because the foremost 
part of the aåbdomen, including the genital opening, is continued 
between the coxae and merges into the sternum. Such a position 
of the genital opening is also found in the Gamasidae; a similar 
position is most typical in the Opiliones. The position of the 
genital opening is sufficient to måke it evident that: the abdomen 
is prolonged between the coxae, for the genital opening is always 
abdominal in the Arachnids; in most of them it is found in the 
second abdominal segment (,,Hansen & Sørensen" 6 pag. 232). 
The coxae are small and placed near to each other on each 
side. The distance between the first pair is smaller than that be- 
tween the second pair. The third pair is farther removed from 
each other than the second but the fourth and more oblong pair is 
placed nearer to the middle line (pl. IV fig. 3). Between the coxåe 
there is a distinct sternum, the front part of which is placed at a 
higher level than the rest. The front margin is articulated to the 
pseudocapitulum by a thin articulation-membrane. The articulation- 
cavity of the pseudocapitulum is directed obliquely down- and back- 
wards so that the pseudocapitulum naturally has a forward and 
downward position. 
Between the first pair of coxae and at the base of the pseudo- 
capitulum two pointed, slender, movable organs (pl. IV fig.3 & 19a) 
are placed. A thin pointed hair is articulated at the outer side 
near their tips and they are terminated by another hair. This 
organ is most similar to Kramer's unpaired ,,Bauchtaster" or 
Winkler's ,,Unterlippe" (20 pag. 324), inthe Gamasidae. Winkler 
homologizes this organ with the labrum in the other Arachnids. 
