162 
wards in a large triangular process, broad at the basis, 
flat on the anterior side, prolongated below in a small, 
somewhat forward directed apex and situated between 
the basis of the mandibles. Adm. marginemaculatus 
is devoid of every trace of frontal process, etc. Together 
with these changes in the frontal process we find other 
changes in the formation of an edge along the anterior 
margin of cephalothorax. These species are, never- 
theless, very closely connected f. ex. in the armature 
with spines on the palpi; it is possible, however, by a 
more profound study of a rich material to find a few 
small reliable points in these structures. Thus I arrive 
to the second character, that is to say, the armature 
with spines on the upper margin of the 5th (claw-bearing) 
joint of the palpi, which just shows an important diffe- 
rence in certain species of Admetus (f. ex. A. fusct- 
manus C. Koch in opposition to A. palmatus). 
Concerning the variability according to age I have 
found but one remark in the literature, viz., by Karsch, 
who says (op. cit. p. 191—92) that the length of the 
palpi in proportion to the length of the body changes 
according to the age of the animal. I have the fortune 
of possessing a rich material of Phrynichus nigri- 
manus C. Koch in almost all sizes, and I am able 
perfectly to confirm this declaration. I shall state the 
following, founded on the measuring of 3 specimens. 
Thelengthofthe The breadth of The- trochanter The trochanter 
cephalothoracic the of the palpiand of the 2d pair 
shield. cephalothoracic femur together. of legs and 
shield. femur together. 
Ist spec. 8 mm. 15,3 mm. 288 mm. 17 mm. 
Ade 5,1 mm. 84 mm. omme 10,1 mm. 
dd - 3,2 mm. 47 mm. 4,4 mm. 6,3 mm. 
It is evident from these measurings 1) that the 
cephalothoracie shield increases considerably more in 
