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Show 1 14 REV. O. P. CAMBRIDGE ON SOME N E W [Jan. 21, from Ceylon ; of the others, one is from the Rio Grande in South America, and the locality of the other is unknown. Further remark on these Spiders is here unnecessary, as the fullest possible details are given in the following descriptions. Of one, however, Tetrablemma, it may be noticed as a striking fact that this, only the second four-eyed Spider known, should be so far removed from any recognizable affinity to the former one (Miagrammopes, Cambr., Journ. Linn. Soc. vol. x. p. 398, pl. 14). It is very difficult to assign with any confidence the systematic position of Tetrablemma. The situation as well as the number of the eyes is very remarkable-the former, I believe, without any parallel among Spiders, being placed contiguous to each other in a circular group, quite at the thoracic junction. While Miagrammopes, therefore, is unmistakably allied to Mithras and to the Epei'rides, Tetrablemma appears to come near to the Dvsderides and Drassides, bearing at the same time some general resemblance to CEcobius -. and it is between these groups that it is, provisionally at least, now placed. Fam. TETRABLEMMIDES. The position of the genus Tetrablemma, of which only at present this family consists, is, as before noticed, by no means certain; but its nearest affinities appear to be between the QZcobiides and Dys-derides. Nov. gen. T E T R A B L E M M A. Cephalothorax broad, oval, rising above from all sides into a somewhat subconical form. Eyes 4, large, but of unequal size, and closely grouped round a strongish circular eminence on the centre of the cephalothorax. Legs short, moderately strong. Maxillae strong, greatly enlarged and rounded at their bases on the outer sides ; extremities going off into a point on the inner sides, strongly inclined towards the labium. Labium small, short, somewhat triangular; sternum large, truncate before, rounded behind. Abdomen of regular oval form, covered with a corneous shield, furnished above the sides and hinder slope with longitudinal corneous folds ; spiracular plates confluent and of large size, covering the larger portion of the underside, and followed by another sub-abdominal plate. Spinners 4, united in a cluster ensheathed in a corneous kind of envelope, and placed beneath the hinder extremity of the abdomen. TETRABLEMMA MEDIOCULATUM, sp. nov. (Plate XII. fig. 1) Male adult, length § line. This exceedingly curious Spider is of a nearly uniform bright reddish orange-brown colour ; the form of the cephalothorax is very remarkable, looking like an inverted cullender, a little prominent near its apex in front. On the margin of this prominence are some small blunt black projecting corneous points, surmounted by a few hairs; the normal furrows are almost obsolete, so that the caput is scarcely |