Page:Supplement to harvesting ants and trap-door spiders (IA supplementtoharv00mogg).pdf/149

 examination, however, of the relative size and position of the eyes in a series of examples, lowers one's estimation of the absolute value of this character in the determination of the species of Nemesia; still it is a specific character not by any means to be overlooked, though to be used guardedly, and often with great reservation.

In regard to other characters and general description there seems but little to add to the description given (l.c. supra), except that the labium has no denticulations at its apex and the outer sides of the genual joints of the third pair of legs are generally without spines. Occasionally (in one example out of sixteen) there is a single spine on this joint, of either the right or left leg. In this character, however (differing from several others described below), the Montpellier spider agrees with that from Mentone.

In both spiders, the fangs of the falces are (in some instances at least) denticulated. Also in regard to the relative lengths of the legs, like those of the Montpellier spider, the second and third pairs of the Mentone species are not constant in their relative proportions, though the differences either way are very slight, and there is often no difference whatever.

The nest and habits of the two species appear to be nearly, if not quite, similar.

In naming the present species (at the suggestion of M. Eugène Simon) the writer of these descriptions gladly testifies to his appreciation of the great value attaching to Mr. Traherne Moggridge's investigations of the habits of the closely-allied species of this very difficult, though most interesting group of spiders.

M. Eugène Simon (Ann. Soc. Ent. Fr. 1873, Bull, c.),