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Show 436 REV. o. P. C A M B R I D G E O N [June 16, and the fore one of each is separated from the fore central one nearest to it by an interval not quite as great as that which divides the hind lateral and the hind central eye nearest to it. The legs are rather short and slender, relative length 4, 1, 2, 3, and are furnished with short hairs. The palpi are short; the cubital joint is bent and enlarges gradually to the fore extremity ; the radial is extremely short, but is produced a little on the inner side of its fore extremity into a long yellow-brown apophysis, which bends abruptly, at about half its length, downwards and inwards, and terminates in a curved, tapering, sharp-pointed, black spine-like form. The digital joint is rather large, of a suffused yellow-brown colour; it has a prominence on the outer side towards the extremity. The palpal organs are prominent and rather complex ; at their extremity are two black spines, one strong and tortuous, the other more prominent, slender, and curved in a circular form ; there is also a strong, shining, dark brown, slightly curved spine on their outer side near the hinder extremity. The falces are small and short, their length being less than the height of the clypeus. The maxilla, labium, and sternum are normal in form. The abdomen is oval and moderately convex above, of a dull pale drab colour, two thirds of the upperside being covered with a finely punctuose dull orange-brown coriaceous epidermis, the spiracular plates and a small patch round and in front of the spinners being of a similar nature and colour; the abdomen is furnished sparingly with short hairs. Thirteen adult females accompanied three of the males above described ; but, except in the smaller extent of the coriaceous epidermis on the upperside of the abdomen, I can discover no appreciable difference between them and the females (also thirteen in number) of E.fissiceps (p. 438). This difference, however, seems to be constant; and I am almost inclined to believe them to be the female sex of the males above described. The general similarity both in form and colours in the adult males of the two species would lead one to expect still greater similarity between their respective females, though the males may easily be distinguished by the cleft and uncleft caput, as well as by the form of the palpi and the palpal organs. The examples above referred to were contained in the collection received from Mr. J. H . Emerton, by whom they were found at Amesbury, Massachusetts, U. S. A., and I have great pleasure in naming after him this pretty and very distinct species. ERIGONE ATRICEPS, sp. n. (Plate LV. fig. 7.) Adult male, length rather more than f line. The caput of this Spider is prominent in front, rather elevated on the occiput, and divided by a deep transverse indenture into two bold rounded divisions or lobes, the foremost being rather the strongest; the occipital eminence forms a kind of roundish oval knob, and is of course higher in its position than the frontal one. The colour of the cephalothorax is orange-yellow, the margins, and normal grooves and |