10 Transactions of the Society. 



The Nymph. 



This is so similar to the nymph of Leiosoma palmicinctum * that 

 I think it will be convenient to point out the differences rather 

 than to describe the whole creature again. The present species is 

 a rather longer and narrower elliptical form than pahnicinctum. 

 The beautiful expanded membraneous hairs, each shaped like a 

 Japanese fan, which form a broad border all round the creature in 

 both species, are similarly arranged along the lateral and posterior 

 margins of the abdomen in both species, but in ixdmicinctum they 

 also run round the anterior margin, entirely covering up the 

 cephalothorax. In the present species they are absent from the 

 anterior margin of the abdomen, but they complete the elliptical 

 border of hairs by running round the margin of the cephalothorax 

 itself, and a similar hair on each leg of the first pair completes the 

 border below the rostrum. This hair is absent in the nymph of 

 palmicinctum, but is present in the larva of that species. The 

 result of this arrangement is that the cast notogastral skins borne 

 on the back of the nymph have not any expanded hairs along 

 their anterior margins, pahnicinctum has. There are three pairs of 

 similar hairs, but longer and more pointed in form, down the 

 centre of the notogaster, being in fact upon the notogastral 

 portion of the cast larval skin. Another very leading distinction 

 between the two species is that in palmicinctum the nervures of the 

 expanded membraneous hairs are reticulated, whereas in ocellatus 

 they are irregularly branched. 



The stigmata and stigmatic hairs (or organs), which are hidden 

 in palmicinctum, are present and conspicuous in ocellatus ; the organs 

 are somewhat lancet-shaped. Another great difference is the 

 entire absence in the present nymph of the four immensely long 

 hairs which project round palmicinctum. 



In other respects than those above named the same description 

 would serve for both species, although the adults are so different. 



I have only found the species upon the yellow lichens which 

 clothe the granite rocks of the Land's End, Cornwall; it is not 

 common even there. 



NOTASPIS LICNOPHORUSjt u. sp. PL II. Figs. 7, 8. 



Average leiigth about * 19 mm. 

 „ breadth „ "ll ,, 



„ length of legs, 1st and 4th pairs, about • 1 mm. 

 2nd „ 3rd „ „ '08 „ 



* Described in this Journal, iii. (1880), p. 184. 

 t AiKyov, a fan ; (pepw. I bear. 



