456 BRITISH OUIBATIDiE. 



This species is easily recognised among the British 

 members of the genus by its small size and long shape. 



Colour dark brown, usually with a very slight red- 

 dish tinge. 



Texture rough and quite dull. The greater part of 

 the body deeply and coarsely pitted. 



Shape a very long pyrif orm and very thick through 

 (vertically) ; it has the appearance of being much longer 

 in proportion to its width than the measurements show; 

 this is the case in many species, and probably arises 

 from the measurement of width being taken between 

 the extreme widest points of the curved abdomen, 

 whereas the eye of the observer recognises the general 

 width but appreciates the full length. 



Cephalothorax conical, deeply excavated for the 

 insertion of the first pair of legs, and to a lesser degree 

 for those of the second pair ; between these pairs of 

 legs are two, and between the second and third pairs 

 one, small chitinous projection on each side, which are, 

 in fact, small tectopedia. Rostrum round-pointed. 

 Rostral hairs short and rather thick. Mandibles and 

 maxillse only slightly dentate. Pseudo-stigmata rather 

 dorsal and placed far forward on the front-outer sides 

 of two large, paired, chitinous mammillsD, which extend 

 back to the progaster, and have a depression between 

 them, in which are placed two short ridges approaching 

 each other and then prolonged forward ; these prob- 

 ably represent the lamellae. A thickened ridge runs 

 along the upper lateral edge of the cephalothorax on 

 each side as far forward as the front of the pseudo- 

 stigmata ; these ridgfes are joined by a transverse ridge 

 at the back of the cephalothorax close to the progaster, 

 between wliich and the ridge there is a narrow trench. 

 The pseudo-stigmata are rather small, projecting trun- 

 cated cones. Pseudo-stigmatic organs rather long and 

 rod-like, or very slightly thickened at the ends, which 

 are sometimes rough. Interlamellar hairs short, thick, 

 slightly recurved. Apodemata joined to the sternum. 



Legs rather short, the fourth pair scarcely reaching 



