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door spider make wafer nests of the same type, 

 each kind of wafer nest having its own peculiar 

 spider. 



This strikes me as a very curious fact, and I await 

 with interest the discovery of new species of wafer- 

 building spiders in order to learn whether this will 

 continue to hold good or not. 



That such discoveries will be made I entertain 

 no doubt ; indeed, I have reason to believe that, even 

 at IMentone, where perhaps more pairs of eyes have 

 been at work searching for trap-door spiders than 

 anywhere else, new species still remain to be detected. 

 In April, 1873, the surface door of a wafer-nest 

 together with a very small portion of the tube was 

 brouo'ht to me from the summit of the AiG:uille 

 mountain, near Mentone. I was greatly surprised to 

 learn that a trap-door spider could live in such a 

 situation, for the earth on that plateau, which has an 

 elevation of 4032 feet above the sea, is always frozen 

 hard for weeks and even months together during the 

 winter, and snow frequently lingers there. The 

 spider, therefore, which endures these conditions is 

 scarcely likely to be of the same species as any one of 

 those inhabiting the lower country. Tiie trap-door 

 spiders of these spurs of the Maritime Alps, are 

 probably of distinct species from those of the plains, 

 but they are absolutely unknown at present. 



Then the males of several species, as, for example, 

 those of Nemesia Simoni, N. suffusa, N. congener, and 

 N. Moggr'idgii, have yet to be discovered ; while of 

 the habits of the males in general we know little or 

 nothing. 



Indeed, there is no one species with the habits of 



