138 
essential by the systematic authors, and that they often 
ignore even systematic papers of the greatest importance. 
This one-sidedness occasions the imperfectness on often 
even essential points in the before named works. By 
studies at an earlier period, the results of which have 
been published in 1883—84, I was tolerably acquainted 
with the types of and the literature on Aranece, Che- 
lonethi (Pseudoscorpiones) and Opiliones; in order 
not to be guilty of the same one-sidedness, I have asked 
permission of the Director of the Entomological depart- 
ment of the Copenhagen Zoological Museum to determine 
our collections of Solifuge, Phrynide and Thely- 
phonidæ; the permission was not only granted and the 
task carried out, but Dr. Meinert left to me a series of 
very valuable types for dissection, for which I owe 
him my best thanks. A little more than half of the _ 
dissected material belonged to the Museum, the rest is 
taken from my own private collection of types of 
Arthropods in spirit. 
With regard to system the Aranece, Opiliones and 
Scorpiones are comparatively well worked out; but the 
treatment of Solifuge, Phrynide and Thelyphonide 
(Tartarides included) is not satisfactory. The Museum 
possesses but one genus of the last order, for which it 
has been impossible for me to elicit systematic 
characters. The material of Solifuge and Phrynide 
is too small for undertaking a new revision of the 
genera, but still sufficient to render it possible to me 
to point out, especially in the first mentioned order, 
new structures of systematic value. Supported by new 
materials, which Dr. Meinert has collected on his journey 
in Venezuela during the years 1891—92, I have been 
able to undertake a revision af Chelonethi with alte- 
rations and additions to my previous paper on this 
order. 
