186 Transactions of the Society. 



or one of Lepisma saccarina, but is broader; the apophysis is 

 inserted like the petiole of a cordate leaf, and is expanded into a 

 hammer-head within the scale ; this head is colourless (the rest of 

 the apophysis being brown), and from it radiate about sixteen 

 black nervures joined by a transparent colourless membrane; the 

 two centre nervures run nearly straight to the distal margin of the 

 scale, those at the edge follow the cordate shape of the proximal 

 margin and terminate near the distal end of the lateral margin. 

 The longitudinal nervures are crossed by finer transverse nervures, 

 which become gradually more delicate and closer together as they 

 approach the distal margin ; they are tolerably regular in the 

 centre of the scale, but become broken and irregular towards the 

 edges ; their general effect is to divide the scale into reticulations, 

 which are nearly triangular at the proximal margin, square in the 

 centre, and oblong elsewhere. The scales all slope downward 

 slightly from the edge of the skin, so as to touch the surface upon 

 which the creature is standing ; they overlap at their edges, and 

 thus form a close margin, or band, round the animal ; each scale is 

 about a third of the width of the real body, thus the band of scales 

 covers more ground than the whole of the rest of the creature. In 

 addition to the lateral overlapping of scales on the same skin, the distal 

 margins of the scales of each cast skin overlap the proximal margins 

 of those on the skin beneath it, so that when the nymph has all the 

 cast skins on (as it usually has), every part, except the cast larval 

 skin, is utterly hidden by the scales, which, as before stated, extend 

 beyond the head, cephalothorax, and legs. The scales are iridescent 

 in daylight, like the wings of the Sesiaclie, and the nymph is then 

 a blunt cone of scales showing prismatic colours, and would scarcely 

 be taken for an animal at all. 



The four apophyses which do not carry scales are longer than 

 the others, especially the front pair ; each terminates in an imbri- 

 cated hair of singular size and length, the hind pair being sometimes 

 as long as the whole body. These long hairs seem to break off from 

 the cast skins ; at least I have not ever seen them remaining, and 

 therefore I have not drawn them. The under side of the creature 

 is corrugated ; the legs, which are set far in, and the cephalothorax 

 of course show, bordered only by the edge row of scales. 



I found both the immature and perfect forms on the hchen upon 

 the granite rocks of the Land's End district and on the moss 

 which grew with it. I only obtained five specimens in different 

 stages as the result of long and careful searching, but possibly 

 the time of year (autumn) was not favourable. Some of these 

 specimens had to be sacrificed in order to trace the creature's 

 history. 



As far as I know, larva, nymph, and perfect form are unrecorded. 

 I propose in that case to call the species ijalmicincta, from the 



