26 Rev. 0. P. Camlbridge on some new II. — On some new Genera and Species of Araneidea. By the Rev. O. P. Cambridge, M.A., C.M.Z.S., &c. [Plates VI. & Vn.] Six out of the eleven spiders here described are from Aus-tralia, two from South America, two from Madagascar, and one from Ceylon. Those from Madagascar are of very great interest ; one [Phoroncidia aurata) is a peculiarly brilliant species of Prof. Westwood's curious genus ; the other [Augusta 'papilionacea) is the type of a new genus, forming a link between the Gasteracanthides and the remarkable spiders of the genus Arcys [Arhys^ Walck.). The general appearance of this spider is very striking, and reminds one of a small butterfly. My thanks are due to the authorities at the British Museum for kindly permitting me to describe and figure those of the above spiders belonging to the family Theraphosides, the types of which are in the national collection. The remainder are described and figured from examples in my own possession. Order Araneidea. Fam. Theraphosides. Gen. nov. Atrax. Generic characters. Cephalothorax much longer than broad, lateral constriction at caput slight ; fore part truncate, and rather narrower than the hinder part ; caput not much elevated above the thorax, though rather roundly convex. Falces large, massive, and very prominent, but with no teeth at the fore extremity of the upperside. Eyes small and not greatly unequal in size ; their position is very nearly that of Nemesia, the four exterior ones (being the laterals of each row) forming a transverse oblong figure whose fore side is rather shorter than the hinder one ; and within this oblong is another shorter one, formed by the fore and hind central pairs of eyes, and whose fore side is consider-ably shorter than the hinder one. Legs moderately long, strong ; terminal claws three ; no sco-pula at the extremities. Relative length 4, 1, 2, 3. Maxilla} long, cylindrical, but prominent in an obtusely pointed form at the inner side of the fore extremity. Labium short, of a round-oval form, rather truncated at the apex.