264 AMERICAN SPIDERS 



NUMBER OF SPECIES 



American European 



Atypus 4 3 



Accatymidae 1 6 i (in Japan) 



Hexura 2 o 



Hypochilidae i o 



Eresidae o 26 



Amaurobius 40 28 



Dictyna 100 37 



Plectreuridae 8 o 



Diguetidae 5 o 



Dysderidae i (cosmopolitan) no 



Caponiidae 4 o 



Palpimamdae i 9 



Pholcidae 30 14 



Leptonetidae 12 23 



Prodidomidae 2 5 



Zodariidae 3 54 



Homalonychidae 3 o 



Zelotes (Zelotes) 26 1 18 



Zelotes (Drassyllus) ... 75 10 



Clubiona 50 48 



Anyphaenidae 43 8 



Ctenidae 4 i 



Selenopidae 4 i 



Heliophanus o 56 



Euophrys 2 45 



Phidippus 55 o 



Metaphidippus 50 o 



Habronattus 50 o 



Urocteidae o 3 



Hersiliidae i 7 



Argyronetidae o i 



Xysticus 50 79 



In summary, then, it can be said that the rich and varied North 

 American spider fauna is very similar to and for the most part de- 

 rived from the same sources as the temperate Eurasian fauna. A 

 moderate segment comes from the American tropics, and its present 



