114 REV. O. P. CAMBRIDGE ON SOME NEW [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 Spicier known, should be so 

 far removed from any recognizable affinity to the former one (Mia- 

 grammopes, Cambr., Jouru. Linn. Soc. vol. x. p. 3^8, pi. 14). It is 

 very difficult to assign with any confidence the systematic posi- 

 tion of Tetrablemma. The situation as well as the numher of the 

 eyes is very remarkable — the former, I believe, without any parallel 

 among Spiders, being placed contiguous to each other in a cir- 

 cular 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 Dysderides and Drassides, 

 bearing at the same time some general resemblance to (Ecobius ; and 

 it is between these groups that it is, provisionally at least, now placed. 



Fam. Tetrablemmtdes. 

 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 CEcobiides and Dys- 

 derides. 



Nov. gen. Tetrablemma. 



Cephalothorax hroad, oval, rising above from all sides into a 

 somewhat subcorneal 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. 



Maxilla 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, trun- 

 cate before, rounded behind. 



Abdomen of regular oval form, covered with a corneous shield, 

 furnished above the sides and hinder slope with longitudinal cor- 

 neous 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 mkdioculattjm, 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 



