longitudinal line along the middle of its fore part on the upper side, intersected by a similar line at right angles; but these lines soon disappeared after death; the specimen had been in spirit of wine some months before the present description was made.
A single example, with its tubular nest of the cork-lid type, was received alive from California in 1873, and appears to have been hitherto undescribed; though no larger than Ct. Sauvagii, it is yet a stouter and more massive spider, and may readily be distinguished by the large size of its fore-lateral eyes, the narrower ocular area arising from the far greater proximity to each other of the eyes of each lateral pair, the less convexity of the caput, and the greater convexity of the thorax, as well as by its being altogether a darker coloured spider, and having shorter stouter legs.
Habitat. Visalia, 350 miles south of San Francisco, California.
Gen. Nemesia, Savigny.
Nemesia Cæmentaria, Plate XIX., fig. B, p. 229.
Mygale cæmentaria (Latr.) Hist. Nat. des Crust. t. vii. p. 164.
—[female]—Walck., Hist. Nat. des Ins. Apt. 1, p. 235.
— — Cuvier's Règne Animal, ed. Paris. 20 vols. 18—? Pl I., A. Dugès del. [male] et [female].
Adult female, length 7 to 9 lines.
Cephalothorax oval, truncated and almost equally broad at each end; the upper surface is moderately convex, the caput elevated a little above the rest, and equally rounded on the sides and upper part; the profile of the whole cephalothorax forms a general sloping slightly curved line, broken by the thoracic
