2 T. THORELL, 
remarks on a third almost contemporaneous performance, SIMON'S Histoire 
Naturelle des Araignées (1864), or, more properly speaking, on the ”Ca- 
talogue Synonymique des Araneides Européennes" which follows it, for that 
catalogue appears to me in many points to require a thorough revision, to 
which I was desirous of offermg some sporadic contributions. 
As the value of remarks on species of animals and plants is often 
somewhat equivocal, unless they be accompanied by descriptions or some other 
guarantee that the species are rightly identified, I consider myself bound to 
inform my readers, that I can with perfect confidence refer to the descriptions 
in WESTRINGS Araneæ Suecicæ, as really belonging to the spiders declared 
by me in the succeeding pages to be identical with species described by him- 
During many years’ residence in Göteborg and constant intimacy with this 
gentleman, my respected teacher and friend, I have had the opportunity 
of becoming accurately acquainted with by far the greater number of the 
species described by him in that work, and all Swedish spiders, that I 
have since collected, I have sent to be examined by him, wherever there 
was the least doubt about their classification. Moreover the species describ- 
ed by WESIRING, which are wanting in my own collection, I have, with 
very few exceptions, had the opportunity of examining; some of them have 
been sent me for examination from the Zoological department of the Natio- 
nal Museum in Stockholm by the kindness of Prof. C. STÅL, and others I 
have received from WESTRING himself? As I have, in identifying the spi- 
ders described by SUNDEVALL, followed WESTRING, who had SUNDEVALL'S 
own collection at his disposition, and whose determinations of the species 
found in that author are aecordingly perfectly trustworthy, and as I have 
moreover myself examined a collection of spiders made by CLERCK, and 
have consecrated a great part of the last twenty years to arachnological 
researches in just that province (Uppland) of Sweden, where CLERCK, LIN- 
NÉ and DE GEER lived and laboured,?) I may reasonably make pretensions 
1) I take this opportunity of openly expressing my thankfulness not only to Mr, 
WESTRING, to whom my thanks are more particularly due on account of the nume- 
rous and valuable communications that I have received from him concerning our Spider- 
Fauna, but also to Prof. STÅL, to Dr. HAGLUND and other friends who have sent me 
the Swedish spiders they had collected. I also beg to express my most sincere gra- 
titude to Prof. Loven and to Mr. AHLSTRAND, Librarian to the R. Acad. of Sciences 
in Stockholm, for the indefatigable kindness and attention, with which they have pro- 
cured me die loan of several important works of arachnological litterature, to which 
I could not otherwise have had access. 
2) On the Swedish species of spiders described by the older Swedish arachno- 
logists I have already published the two following works: Recensio critica Aranearum 
