On EUROPEAN SPIDES. 19 
armature of the legs, the number of claws on the tarsi, ete. Genera, which 
rest exclusively on such characteristics as belong only to one sex, leaving 
the other undetermined, I have not adopted, but consider that they ought 
to be unreservedly rejected. I ought to call especial attention to the cir- 
cumstance, that exotic forms have not been taken into consideration in the 
formation of these schematic reviews, which accordingly can be used as a 
clew in classifying such species only, as belong to the Kuropean fauna. 
The characteristics of the swb-orders, as they cannot be expressed in few 
words, and indeed may be considered as generally known, I have not thought 
it necessary to repeat, but refer for them to e. g. LATREILLE'S, SUNDEVALL’S, 
WESTRINGS and OHLERTS works. 
In the catalogue of arachnological litterature, with which I have 
opened this treatise, I have included all the works known to me on now 
existing European spiders, of a descriptive, systematical and 200-geographical 
character, with the exception however of such writings as belong to the 
pre-Linnean period, of which only a small number of works, referred 
to in the following pages, have been admitted. Works belonging to that 
period, among which I also reckon writings of later date, in which LINNÉ'S 
binominal system is not fully adopted, are in the list marked with a 7. 
Moreover for reasons, that are easily understood, zoologieal handbooks and 
compendia, in which no new facts relating to our subject are communicated, 
have been excluded. Of works which as regards spiders contain only no- 
tices of their anatomy, economy etc., I have taken into my list only those, 
which I have occasion in this work to cite, and they are distinguished 
from others by their titles being included in brackets []. Of the littera- 
ture that treats exclusively of ewotic spiders, I have similarly admitted 
only such works, as I had occasion to cite. Their titles are printed in 
smaller types. Some of the works in the catalogue I have not myself had 
the opportunity of consulting; these are marked with an asterisk, and 
whenever I have been obliged to quote such a work, I have always indica- 
ted the source from which I have derived the citation 5. 
Before proceeding to the special examination of the three works 
before us, I ought perhaps to give a short general account of each of them. 
1. WESTRINGS Aranee Suecice contains complete and accurate 
descriptions of 308 species of Spiders found in Sweden and Norway, of 
which 34 belong to the family Epeiride, 115 to Theridide, 63 to Drasside, 
1) For rectifications or additions to this catalogue, either privately or publicly 
communicated, the author will feel very thankful. 
