1877.] 71 [Emerton. 



Among the Attidse, Salticus scenicus, Attus falcatus, Atlus fasciatus 

 and Euophrys reiiculatus, are found in both countries. 



The American species of Dendryphantes are numerous, and all 

 appear to be different from European. 



Two species of Phidippus, Attus mystaceus and A. tripunctatus 

 Hentz, are among the commonest American Attidaa as far north as 

 Massachusetts. 



The American Lycosidae and Drassidse are yet hardly well known 

 enough to be compared with the European. A common American 

 Drassus is nearly related to D. lapidicola, though not identical with 

 it, as stated in my list in " Psyche," of January, 1876. A Gnaphosa 

 from New Hampshire appears to be G. muscorum of Europe. A 

 common Phrurolithus is near P. festivus. Herpyllus ater Hentz is 

 near Melanopliora petrensis. 



The only Dysdera yet found is hardly to be separated from D. era- 

 cota. Pylarus bicolor Hentz belongs to the genus Ariadne. 



Argyroneta, which has the peculiar habit of living under water, 

 has not been found in America. 



We see from this list that the greater part of the known spiders in 

 North America belong to the same genera as those of Northern 

 Europe, and about one fourth to the same, or similar species. Of the 

 latter, a large proportion belong to the smaller genera, as Ocyale,. 

 Tibellus, Eucharia and Hyptiotes, while such groups as Lycosa, Xys- 

 ticus, Clubiona, Dictyna and Erigone, having large numbers of 

 species in each country, have fewer species common to both. 



The occurrence of several house spiders in both countries, leads to 

 the suspicion that they have been carried by man from one to the 

 other, as Theridian tepidariarum in Europe, and Salticus scenicus, 

 Amaurobius ferox and Pholcus phalangioides in America. On the 

 other hand, many of the commonest spiders appear never to be 

 transported, as the European Epeira diademata and the American? 

 Agelena ncevia. 



The peculiar distribution of two species can hardly be due to any 

 recent cause, Epeira packardii and its relative E. carbonaria living 

 on the White Mountains and the Alps, and Meta menardi living in 

 caves in both countries. 



A conspicuous difference between the two faunas is the larger num- 

 ber of southern spiders which come north into a colder climate in 

 America than Europe, as the genus Argyrodes, Argiope, Theridion 

 spluerula, Epeira spinea and rugosa and Phidippus. From the collec- 



