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Show 356 REV. O. P. CAMBRIDGE ON NEW SPIDERS. [Julie 5, The whole falces are, however, more massive than in the male, and they are furnished with strong spines above at the extremities. The spines also on the legs are stronger, and are found on the metatarsi of the first pair as well as of the last. The palpi are also furnished with strong spines, and the legs themselves are shorter. Examples of this most interesting Spider were kindlv sent to me by Mr. J. J. Rivers from Berkeley, California, who tells me that it tunnels in banks mostly by streams, forming a tubular projection above ground of any material at hand, woven up with silk, making no trapdoor, but closing the aperture at times. It has a close general resemblance to Atypus; but the very different form of the maxillae distinguishes it at a glance and necessitates the formation of a new genus for its reception. It is with much pleasure that I connect Mr. Kivers's name with this Spider. DRASSIDHE. AMATJROBIOIDES, g. n. Cephalothorax oblong, its length double its breadth ; the lateral marginal constriction at the caput is slight but perceptible; the profile forms a continuous curve from the hinder slope to the fore extremity ; normal indentations very slight. Eyes of moderate size, placed on slight tubercles on somewhat of a prominence, in two transverse slightly curved rows at the middle of the fore part of the caput close to the margin, and forming a segment of a circle ; the posterior pair is much the longest; their position is very like that of Clubiona, but they form a less laterally extended area. Legs moderate both in length and strength, 1, 4, 2, 3, the difference between 1 and 4 being very slight; furnished with hairs and spines; the latter, chiefly beneath the tibiae aud metatarsi, few and fine ; a not very dense scopula beneath the tarsi and metatarsi; tarsal claws 2, pectinated, and below them is a claw-tuft. Falces long, powerful, prominent at their base in front and strongly arched in profile. Maxilla long, strong, enlarged and divergent at their anterior extremity, where they are rounded on the outer side, but obliquely truncated on the inner side. Labium oblong-oval; more than half tbe length of the maxilla?. Sternum elongate-oval, pointed behind and truncated in front. Abdomen oval and of moderate convexity on the upperside. Spinners compact, of uniform length, moderately long and strong; those of the inferior pair much the strongest. AMATJROBIOIDES MARITIMA, sp. n. (Plate XXXVI. fig. 3.) Adult female, length rather more than 5 lines. Cephalothorax dark yellow-brown, deepening to red-brown and black on the caput; clothed thinly with short fine hairs ; the height |
