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Show 440 REV. O. P. CAMBRIDGE ON SIBERIAN SPIDERS. [May 6, that of the facial space ; it is strongly impressed immediately below the eyes, and prominent at its lower margin. The eyes are in the ordinary position and not greatly unequal in size. All are seated on tolerably strong tubercles ; those of the lateral and fore central pairs being the strongest; the eyes of the hinder row are about equidistant from each other; those of each lateral pair are very nearly contiguous to each other, the fore laterals being the largest of the eight. There is a slight interval (of less than half an eye's diameter) between those of the fore central pair, which are the smallest of the eight, though larger than in most species of Linyphia. The tegs are long, pretty strong; their relative length appeared to be 1, 4, 2, 3 ; and they are furnished with hairs and rather long and strong spines. The palpi are, like the legs, of a clear bright yellow colour, and furnished with hairs and spine-like bristles. The abdomen is oval, of about the ordinary eonvexity above, and projects considerably over the base of the cephalothorax ; its groundcolour is pale yellow, more or less covered with small, irregular, white, cretaceous spots and markings ; and the following pattern in black is also visible-a central longitudinal marking on the fore half of the upperside, strongly hollowed or indented on the sides, and two longitudinal rows of irregular spots, rather converging towards the spinners ; the posterior pairs of these spots bear traces of being (what no doubt they are) the dilated extremities of the ordinary angular lines or chevrons with which the hinder portion of the abdomen in so many spiders is marked ; in the present, as in many other species, the apices of these angular lines are obsolete. The sides of the abdomen are occupied by a long black patch, strongly dentated on its upper margin, and its lower and hinder margin bounded by a broken whitish-yellow line or bar formed by that portion of the ground-colour. The underside and a clear portion round the spinners are of a uniform, somewhat vinous, yellow-brown. The sexual aperture is prominent, and furnished with a longish, curved, longitudinal process, which (looked at with the Spider on its back) is considerably dilated at its hinder extremity. Two adult females and an immature male were contained in M. Taczanowski's Siberian collection of Micro-araneae ; they seem to me to be very distinct from any species yet known, and to be (in colour and markings) nearly allied to Linyphia (Neriene, Bl.) variegata (Bl.), but greatly exceeding that species in size. The future discovery of the male in an adult state will probably show some strong structural characters in the palpi and palpal organs by which to differentiate that sex from the males of other nearly allied species. Genus ERIGONE (Neriene, Bl., ad partem + Walckenaera, Bl.). ERIGONE (NERIENE, Bl.) FLAVESCENS, sp. n. (Plate XL. fig. 6.) Adult male | of a line ; adult female slightly longer. The whole of the fore part of this small Spider is of a pale but clear and brightish yellow colour, (he abdomen being paler and more |