TRAP-DOOR SPIDERS. 197 



markiDgs from the so-called ccementaria of Mentone. 

 M. Simon had previously informed me that he con- 

 sidered our Mentonese spider distinct from the typical 

 ccemeuiaria, and had kindly proposed to give my 

 name to the Mentonese species ; and now Mr. Pickard- 

 Cambridge, on the receipt of the specimens collected 

 by me at Montpellier, coincides with M, Simon, and 

 adopts his nomenclature, calling the Mentonese 

 Nemesia N. Mof/f/rid^ii.^ 



I found but one nest of tlie cork type at Mont- 

 pellier, where it was most abundant, and invariably 

 inhabited by the same spider, so that there can be 

 little doubt that this is the celebrated Nemesia camen- 

 taria of Latreille, the nests of which were described 

 by the Abbe Sauvages in 1763. 



When living, the pattern on the abdomen is far 

 more distinct and is traced on a paler ground than in 

 N. Moggridgii, and the patterns on the back of the 

 caput, as seen in specimens preserved in spirits, and 

 the relative sizes of the lateral eyes, as well as other 

 details enumerated by Mr. Pickard-Cambridge, afford 

 characters by which they may be known apart ; and 

 it is probable that when the males, which are at 

 present unknown, shall be discovered, they will be 

 found to present other distinctive peculiarities. In 

 the present instance we have the reverse of the 

 case described above, in which two very distinct 

 spiders constructed a similar nest, for here both 

 spiders and nests are much alike. 



We have yet to learn what are the special advan- 

 tages which each type of nest affords ; but it is plain 



* See below, p. 273. 



