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.), perceiving the difference between the present species and the one known to himself as _N. cæmentaria_, Latr., concludes it to be identical with _N. meridionalis_, Sim. Examples, however, of this latter, from M. Simon's cabinet, show that they are very distinct. On _N. meridionalis_, Sim., see p. 289; and on _N. cæmentaria_, Sim., p. 280, M. Simon has, I understand, subsequently admitted the error of his conclusion, published l.c. _supra_. _Habitat._ San Remo, Mentone, Cannes, Hyères, and Marseilles. Nemesia incerta, sp. n., Plate XIX., fig. D, p. 229. Adult male, length slightly above 4-1/2 lines. _Cephalothorax_ oval, truncate at each end; moderately convex above, the profile line forming a pretty even, sloping, curved line, but flattish in the middle near the thoracic fovea, which is of a strongly curved form; the other normal indentations are not strong, though fairly defined; the colour of the cephalothorax is yellow-brown, palish and clothed with yellowish-grey adpressed hairs on the margins, and inclining to orange on the caput. The clypeus is somewhat steep, about equal to half the height of the facial space, and the sides of the caput are dark blackish-brown, leaving a longitudinal, central reddish orange-brown band tapering to the thoracic fovea. The upper and hinder part of the thorax is strongly suffused with brown, leaving broad but irregular pale lateral margins; there is a group of strong bristles directed forwards from the margin of the clypeus, and two or three more in the median line behind the ocular area.