238 ENTOMOLOGISK TIDSKRIFT 1897. 
posterior pairs of limbs patella and tibia are well developed, 
while in the second pair only one single joint is present. 
4. The abdomen consists of eleven segments (which are 
not divided into dorsal and ventral plates). In the Pedzpalpz it 
consists of twelve segments, which (except the three hindmost 
ones in the Uvopygz) are divided into a dorsal and a ventral 
plate. (Only in Ambdlypygi and Tartarides the first ventral 
plate is very sparingly chitinized. Comp. the above announced 
treatise in »Oversigt over det Kgl. Danske Videnskabernes Sel- 
skabs Forhandlinger».) 
We have here enumerated the characters which in our opi- 
nion define the order Palpigradi. For in our eyes none of the 
other characters of Avenenza — either of such taken from the 
skeleton or from the anatomical structure”! described by Grass! 
are of so great importance that they exclude Aoenenza from any 
of the other orders, especially from the Peazpalpz. Of course, when 
being acquainted with only one species of a group of higher rank, it 
is very difficult to decide which characters would define the 
genus and which the family. Nor will we attempt to lay down dia- 
gnoses of the genus Kvoenenza or the family Koenenoide, for if 
we have considered ourselves capable of pointing out the most essen- 
tial characters defining the order Palpigradi, it is due in a great 
measure to the fact that we possess some knowledge of the other 
orders. We do not think it at all likely that Koenenza mira- 
bilıs should be the only now living animal of the order Palpi- 
grad. Only when knowledge of new forms is obtained, and 
particularly of rather deviating forms, it will be possible to say 
with absolute certainty if the principal characters of the order 
— consequently our view of it — are correct. 
In conclusion we take the liberty of asserting most positi- 
vely that we think Grassi (this otherwise most meritorious au- 
thor) mistaken in seeing any affinity between Koenenza and 7%y- 
sanura. For beyond the fact that Koenenza (with other Arach- 
*4 Thus we do not ascribe any systematic importance to the fact that 
respiratory organs are wanting in Aoenenia. We feel bound to accentuate this 
statement, because (in our opinion) it is a great mistake to assign any higher 
systematic value to the feature that the organs of respiration in Arachnids 
appear under two forms: as tracheæ properly speaking and as so-called »lungs». 
16 
