ZOOLOGY. ARTHROPOD A. 161 



from many foreign ports, the diift 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 in- 

 digenous spider fauna. 



This fact has been noticed in all localities open to the im- 

 portation of a foreign element. These species are then called 

 cosmopolitan, and by far the greater number of those brought 

 to notice by Mr. Blackwall and Prof. Heilprin bear this char- 

 acter; but drawing a superficial conclusion from this material 

 it seems that the spider fauna of the Bermudas is more 

 American than anything else, for out of the seventeen species 

 now known, only four are original (so far) to these Islands, and 

 nine are found also in the limits of the United States. 



Lycosa Atlantica, nov. spec. 



Cephalothorax dark olivaceous brown, with a narrow longi- 

 tudinal yellow band over the middle, which begins at the pos- 

 terior margin and runs over the whole length into the region 

 of the first eye row. Another, equally colored, but somewhat 

 broader, band runs at the sides, above the, lateral margin, ter- 

 minating at the sides of the pars cephalica. Mandibles dark 

 brown with long, thick, and black pubescence. Maxillae and 

 labium more reddish brown ; sternum lighter, olivaceous yel- 

 low with a lighter border, baity. Palpi and legs uniformly 

 light olivaceous yellow, with black hairs and without rings or 

 markings, tarsal joints of the former infuscated. Abdomen: 

 dorsum dark olivaceous brown with a narrow, whitish, slightly 

 spear-shaped figure, which is edged by a very narrow blackish 

 line; behind this a row of four rather indistinct white (small) 

 round spots, which reach the apex. Venter light yellow, mid- 

 dle region still lighter. 



Cephalothorax as long as patella X, tibia IV; one-third 

 longer than wide ; back straight, evenly sloping in back and 

 front, face nearly perpendicular. Lower eye row longer than 



