Emerton.] TO [January 3, 



nearly related that the females can hardly be distinguished from 

 each other. 



Lithyphantes corollatus and Theridium stictum are found near 

 Boston. • 



Theridion tepidariorum, found in Europe only in plant houses, is 

 one of the commonest house spiders in North America. 



Ero variegata occurs in both countries. 



Pliillonethis Kneata, a very common spider in Europe,, has been 

 found near the coast in Massachusetts. 



Theridion sphcerula Hentz, found in Massachusetts, has its nearest 

 European relatives in Corsica. 



The genus Theridion, including T. pictum, T. varians, etc., in 

 Europe, has about the same number of species in America, but all 

 different from the European. 



Pholcus phalangioides and Scytodes thoracica are found in both 

 countries. 



Of the Thomisidse, the genera Xysticus and Oxyptila are largely 

 represented in both countries, but by different species, while in the 

 genus Tibellus two species, T. propinquus and T. oblongus, are com- 

 mon to both countries. 



Misumena valia = Thomisus farius Hentz is found in both coun- 

 tries, and has in both the same variations in color and markings. 



The European Ocyale mirabilis is represented in America by 

 Micrommata carolinensis Hentz, a species approaching nearer the 

 genus Dolomedes. 



The genus Oxyopes has several species in the southern United 

 States, but is not found so far north in America as in Europe. 



The Agelenidse appear to be less numerous in species in America 

 than Europe. A. ncevia Hentz, the commonest American form, is 

 very different from the common European species. Tegenaria medi- 

 cinalis Hentz is allied to the European species of Tegenaria and 

 Celotes. T. derhamii of Europe is found in cellars in America. 



The genus Hahnia is well represented in America, but so far as 

 compared, all the species differ from the European. 



Amaurohius ferox is found in America, but thus far only in cellars 

 of houses. A. claustrarius has been found on Mt. Washington. 



Hyptiotes has in Europe H. paradoxus, in America H. americanus 

 = Cyllopodia cavala Hentz. Ulobarus has in North Europe U. 

 walckenosrius, in North America Phyllyra riparia Hentz, which, how- 

 ever, is more allied to U. plumipes of the south of Europe. 



