Page:Supplement to harvesting ants and trap-door spiders (IA supplementtoharv00mogg).pdf/59

 markings from the so-called cæmentaria of Mentone. M. Simon had previously informed me that he considered our Mentonese spider distinct from the typical cæmentaria, 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. Moggridgii.

I found but one nest of the cork type at Montpellier, 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 cæmentaria of Latreille, the nests of which were described by the Abbé 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 advantages which each type of nest affords; but it is plain