THE COMITY OF SPIDERS
Some islands are undoubtedly oceanic in origin and have never
been joined to any mainland; others have had their fauna obliterated
by ice caps (Spitsbergen) or by volcanic eruptions (Krakatoa) since
they became islands. All have a flourishing spider fauna now, which
cannot be attributed either to land bridges or to man's agency.
Berland expresses the regret that if my assessment of the
importance of aerial dispersal were justified, all value attaching to
spiders as evidence of changed geographical boundaries would
disappear. With this view I do not entirely agree, but I do stress the
importance of caution. I will return to this subject after discussing the
two principal means by which spiders are dispersed.
B. TRANSPORTATION BY MAN.
When moving house I have noticed
amongst my incoming furniture. In boxes of flowers brought back to
London from the country I have found
and small Linyphiids. In fishing boats and
webs. On board ship bound for Brazil
On the way to the East a
Apart from these personal observations I owe additional evidence to
friends. O. W. Richards has sent me
Fuess. from the London docks.
Ports ranging from Dundee to Dover have yielded me West Indian
Salticids, Brazilian Ctenids and Mygalomorphs, a Selenopid and
Pholcid of unknown tropical origin, a Canary Island Zoropsid
Camb.) and Theridiid (
Thor.)*, and numerous specimens of the widespread tropical
This last spider comes into this country in hundreds
* A. F. Millidge has just sent me another Canary Island inhabitant caught in the I. of
Wight outside a fruit shop the Sparassid,