436 MR. LUBBOCK ON THE THYSANURA. 



a foil, or rather perhaps a drop of dew, except that the form is more elliptic. The ter- 

 minal portion of the organ has no hairs ; it has a broad knife-like shape, and is -009" 

 in length by -0025" in breadth. On its inner margin it has a row of minute teeth ; 

 the outer edge is smooth. At the base of the spring are two peculiar, thickened parts of 

 the skin (PL XLV. fig. 13). They are constant in form and position : the shaded part 

 seems to be rather thicker than the rest ; but the whole structure is transparent, and 

 more refractive than the skin round it. They do not serve as attachments to muscles, 

 and I am at a loss to understand what their function can be. On each side of the anus 

 are two great scimitar-shaped organs (PI. XLV. fig. 14), which are no doubt gigantic 

 and specially modified hairs. They appear, indeed, to agree with the ordinary ones in 

 their constitution and mode of attachment. Tliey are about -008" in length, and -001" 

 in breadth. The apical half of the inner margin, and a small part of the outer edge, 

 are roughened by irregular teeth, which, however, are so unsymmetrical as rather to 

 suggest the idea of the border being fretted by use. The two scimitars did not even 

 agree in the extent to which they were thus aifected. 



Papirius, Lbk. 



The characters of this genus have been given above. 

 PAPiKirs CURSOE, n. s. Body globular, with scattered hairs ; abdomen without a re-en- 

 tering angle. Colour dull purple. Eyes not situated in a black patch. Ends of 

 spring pale. Antennae fom'-jointed ; terminal segment short, with about ten distinct 

 whorls of hairs, but without actual joints. Claw with two distinct teeth on the 

 lower margin. 



Length -05". 



PL XLVI. fig. 25, represents a form of Oregarma frequently found in this species. 



This species occurred, with the preceding, under logs of wood. It appeared, however, 

 somewhat later in the autumn ; at least, I found the first specimen towards the end of 

 October. It was common through November, but died out again towards the end of the 

 year, reappearing in May. 



The structure of the antennse at once distinguishes this species from all those described 

 by M. Nicolet. In this respect it approaches more nearly to the Smyjithurus viridis of 

 Templeton, from which, however, its colouring is entirely different ; and Mr, Templeton 

 does not, unfortunately, give any anatomical details. 



The legs are longer than in the preceding species ; the animal is altogether more lively, 

 not indeed so fond of walking as the following species, but more so than S. Buskii, which 

 does not very often move except by leaps. 



The antennse are much longer than in the preceding species, the increase being in the 

 two middle segments. The whole organ has a length of -055", with the comparatively 

 small thickness of -002". The basal segment is -005" in length ; the second -0225" ; 

 the third is a little longer than the second, and especially towards its apical end, wliich is 

 slightly swollen, and resembles a knobby stick. The terminal segment is about as long as 

 the basal, and is somewhat conical. The whole organ is covered with scattered hairs, 

 which are particularly numerous on the distal half of the third and on the apical segments. 



