424 BRITISH 0RIBATID2E. 



become browner and darker. Legs lighter than the 

 body. 



Texture smooth but not pohshed ; the creature has 

 a powdery appearance, and is often more or less covered 

 with what looks like short matted white cotton ; this 

 is really some portion of the nymphal skin. It occa- 

 sionally also carries more or less dirt. 



Cephalothorax distinctly divided into three divisions 

 by transverse furrows or constrictions ; the central 

 division is shorter, from anterior to posterior margin, 

 than the others. The anterior division is considerably 

 the narrowest ; it forms the rostrum, and is conical, with 

 a rounded apex ; it is without markings, but the lower 

 edge (epistome) of the antero-lateral portion slightly 

 projects. There are a pair of small, curved, rostral hairs, 

 and a considerably larger pair on the dorsal surface of 

 the rostrum. The central division has a large, pro- 

 jecting and raised, rectangular, chitinous piece on each 

 side, to the outer edge of which the first leg is articu- 

 lated ; near the inner edge of this piece is a sharp 

 longitudinal furrow. Between these two pieces this 

 division of the cephalothorax is somewhat arched, and 

 bears two not very plainly-marked longitudinal ridges. 

 The posterior division is the broadest. The pseudo- 

 stigmata, which are very projecting tubes, are placed 

 near its anterior margin on the tops of mammilliform 

 elevations. Pseudo-stigmatic or gansfilif or rrij of mode- 

 rate length, not so long as those of D. geniculatus, 

 Interlamellar hairs short, setiform, sharply curved. 

 There are two very short similar hairs, one on the outer 

 side of each pseudo-stigma and quite close to it ; these, 

 however, are not easily seen. Behind the mammilliform 

 elevations are four short longitudinal ridges, not quite 

 reaching the abdomen. At each side of this division, 

 between the first and second leg, is a strong chitinous 

 projection, much longer and narrower and much more 

 pointed anteriorly than the similar part in D.geniculatus; 

 the anterior portion projects most, and the anterior 

 edge is considerably excavated to give play to the femur 



