1889.] NATURAL SCIENCES OF PHILADELPHIA. 99 



Heteropoda venatoria, Lin., seems to occur, under a certain 

 latitude, everywhere around the globe.* 



Filistuta depressa, synonymous (according to Simon) with F'distata 

 capitata, Hentz, is quite common in the southern part of the United 

 States. 



Uloborus Zosis, Walk., is recorded from the West India Islands, 

 Central and South America, and occurs also sometimes in Southern 

 Florida. 



Nephila clavipes, Koch, found in Brazil, Central America and 

 Florida, Texas, Mississippi. 



Eperia caudata, Hentz, inhabits the United States from 

 Massachusetts to Georgia. 



Epeira labyrinthea, Hentz, is also common in the United States, 

 and has been collected in the West Indies, Central and South 

 America, as far south as the Straits of Magellan, and in Lower and 

 Upper California. 



Theridium tepidariorum, Koch, is common to Europe and 

 America. 



Argyrodes nephilce, reported from Peru, Cayenne and the southern 

 states of the United States. 



Pholcus tipuloides, Koch, has been described by this author in his 

 work, " Die Arachniden Australiens," page 281, from specimens 

 collected at the Samoa Islands. 



Dysdera crocata, Koch, is recorded from Greece, France and 

 Germany, and is also common in the United States. 



Menemerus Paykullii, Aud., and Menevxerus melanognathus, Luc, 

 have been found nearly everywhere on the globe. 



From this material it is difficult to infer the true character of the 

 fauna of these Islands. The frequent arrival of vessels from many 

 foreign ports, the drift of the Gulf Stream, and other causes, have 

 introduced into this region a number of species originally foreign 

 to that locality,, but which, in time, not only have acclimatized 

 themselves, but have, in a more or less marked degree, driven away 

 and extinguished the indigenous spider fauna. 



This fact has been noticed in all localities open to the importation 

 of a foreign element. These species are then called cosmopolitan, 

 and by far the greatest number of those brought to notice by 

 Mr. Blackwall and Prof. Heilprin bear this character; but drawing 



*See an article by Rev. H. C. McCook, in Proceed, of Academy uf Nat. Sc. 

 Philad., 1878. 



