60 Mr. R. I. Pocock on new 



A single specimen obtained by Mr. J. Whitehead on Mount 

 Kina Balu in North Borneo. 



In its long anal pleurae this new species resembles those 

 species o^ Heterostoma of which plati/cepkalum may be regarded 

 as the type. The spine-armature of the anal leg, as it has 

 been described, may be abnormal, for one leg is entirely 

 missing and the other is damaged. 



Rhysida longicornis, sp. n. (PI. IV. fig. 5.) 



Body slender and nearly parallel-sided. 



Colour (in alcohol) wholly ochraceous, shining. 



Head-plate sparsely punctured, not sulcate. 



Antennce very long, reaching when stretched laterally to 

 the end of the eighth tergite, composed of twenty-one long 

 cylindrical segments, whereof the basal three are bare and 

 the rest pubescent ; in the distal half the segments are at 

 least twice as long as wide. 



Maxillary sternite entire, feebly punctured ; prosternal 

 plates, in contact, wider than long, the anterior edge convex 

 and bearing four blunt conical teeth ; basal tooth prominent 

 and subdentate. 



Tergites smooth, from the fifth bisulcate, from the tenth or 

 eleventh marginate. 



Stermtes smooth, sparsely punctured, not completely bisul- 

 cate, there being only two very short sulci quite on the ante- 

 rior portion. 



Anal somite. — Tergite not sulcate, with raised lateral 

 margins ; pleurce densely porous, furnished with a long stout 

 process which is armed with one strong lateral spine, one or 

 two small superior spines, and three strong apical or subapical 

 spines ; sternite narrowed posteriorly, with emarginate border ; 

 legs long and slender, femur armed with from ten to thirteen 

 strong spines, that is six or four in an irregular series on the 

 upper inner edge, four or three on the under inner edge, and 

 three on the under outer edge ; there is no spinous process and 

 no spine in the position of the process ; tarsal segment un- 

 spined ; claws with basal spurs. 



Legs. — From the seventeenth to the twentieth pairs each 

 with a single tarsal spur, the sixteenth to the first with two 

 tarsal spurs, the third with a tibial spur (second pair absent), 

 the first with a tibial and a patellar spur ; claws of all bical- 

 carate. 



Stigmata of normal form. 



Length about 43 millim., of antennee 12 millim. 



A single specimen from Socotra, collected by Prof. I. B. 

 Balfour. 



