178 
THE COMITY OF SPIDERS 
certain that the present distribution is of much more recent occurrence. 
Hypothetical land bridges, it seems to me, have sometimes been 
suggested to explain facts of distribution which have puzzled 
zoologists who have not credited invertebrates with sufficient powers 
of dispersal, and who have not realized their intolerance of even quite 
small differences in environmental conditions. It is interesting to 
reverse the process by inventing islands in order to see what 
conclusions the ardent protagonists of land bridges might draw from 
the resulting faunas! Were the sea to encroach eastwards from the 
Severn estuary and to follow the course of the Thames across England 
to the Thames estuary the southern part of England would be 
converted into an island. In this relatively small island we should have 
no less than 54 spiders absent from the mainland of England, Wales 
and Scotland. Since most of these species occur in France there might 
be a temptation to suggest a land connection with that country more 
recent than with England if we did not know the history of the 
severance! These species are: 
Eresus niger 
Pet., 
Dictyna puella 
Sim.,
  D
.
 viridissima 
Walck., 
Lathys stigmatisata 
Menge., 
Uloborus walckenaerius 
Latr., 
Scytodes 
thoracica 
Latr., 
Segestria bavarica 
C.L.K.,
 Drassodes minor 
Camb., 
Phaeocedus braccatus 
L.K., 
Zelotes pedestris 
C.L.K.,
 Gnaphosa 
occidentalis 
Sim., 
Micaria scintillans 
Camb., 
Cheiracanthium
,
 pennyi 
Camb., 
Agroeca pullata 
Thor., 
A
.
 lusatica 
L.K.,
 Agraecina striata 
Kulcz.,
 Phrurolithus minimus 
C.L.K.,
 Pistius truncatus 
Pall., 
Xysticus 
robustus 
Hahn., X. 
luctator 
L.K.,
 Oxyptila nigrita 
Thor., 
Philodromus 
levipes 
Linn., 
Thanatus formicinus 
Oliv., 
Salticus zebraneus 
C.L.K.,
Heliophanus expers 
Camb., 
Euophrys molesta 
Camb., 
E
.
 lanigera 
Sim., 
Sitticus zimmermanni 
Sim., 
Phlegra fasciata
,
Hahn., 
Pellenes 
tripunctatus 
Walck., 
Oxyopes heterophthalmus 
Latr., 
Lycosa 
paludicola 
Walck., 
Tarentula fabrilis 
Walck., 
Xerolycosa nemoralis 
Westr., 
Aulonia albimana 
Walck., 
Cryphoeca moerens 
[?
maerens
]
Camb., 
Aranea inconspicua 
Sim.,
 A
.
 alpica
 L.K.,
 A
.
 angulata 





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