422 BRITISH oeibatidj1<:. 



each other joint of each leg ; all these hairs are slightly 

 imbricated. There are also some fine straight hairs 

 on the tarsi. The tactile hairs are not strongly de- 

 veloped. 



Abdomen, as seen from the dorsal aspect, appears 

 almost globular. The progaster is rounded, forming 

 an unbroken curve with the rest of the periphery. 

 The notogaster is without marking ; it bears a row of 

 about eight strong, almost straight, black hairs on each 

 side, which diminish in length from the 'progaster to 

 the hind, margin. There is also a pair of hairs on the 

 hind margin itself ; all these hairs are slightly imbri- 

 cated. There is a small blunt projection in front of 

 the insertion of each third coxa, and a larger one, to 

 the anterior angle of which this coxa is articulated. 

 The creature sometimes carries the cast skins as a small 

 shrunken lump on the notogaster. 



Nymph. 



This creature is so like the nymph of B. tecticola 

 that it appears unnecessary to repeat the description. 

 The differences are, firstly, that the legs of the present 

 nymph are the longer, secondly, that the pseudo-stig- 

 matic organs exhibit the same differences in form 

 as the adults ; thirdly, the present nymph is more 

 colourless than that of D. tecticola; and fourthly, 

 the cast skins are carried, not flat on the back or 

 crumpled, but in a pile, each skin preserving its 

 original form, so that they look like a diminishing 

 series of dish-covers, and they show the reticulation 

 strongly. In the centre of the notogaster is a long 

 process of the cuticle, thicker than an ordinary hair, 

 which supports the lowest cast skin ; from this skin 

 springs a similar process, which supports the second, 

 and so on ; thus they form a continuous pillar support- 

 ing the cast skins, but entirely hidden unless the 

 transparency of the skins allows them to be seen 

 through. 



