2 [June, 



This little auimal differs chiefly from L. ambulans (L.) in colour, 

 aud also in facies, being broader in proportion to its length, and 

 having the joints of the antennae more distinctly separate. It lives 

 under stones, moving about very briskly, in spite of its blindness, and 

 the contrast between the orange body and white antennae and feet 

 makes it an extremely beautiful little insect. All its colour disappears 

 in spirits and it becomes quite white. 



I propose for it the name Lipura aurantiaca. 



20, Portsea Place, Connaught Square : 

 May, 1880. 



A NEW SPECIES OF MACHILIS. 

 BY HENRY N. RIDLEY. 



On May 1st, 1879, in an expedition made with the Woolhope 

 Society's Field Club to the waterfall known as Water-break-its-neck, 

 in the Radnor Forest, I captured three specimens of a Machilis 

 unknown to me ; at that time I had not carefully studied the genus, 

 and so referred them to the species pohjpoda (Linn.), but on further 

 examination I was convinced that the species was new ; and having 

 this year succeeded in procuring additional specimens, am enabled to 

 describe it. 



The length of the body is 9 mm., and that of the antennae 4 mm. ; the central 

 caudal seta is 8 mm. long. The colour varies somewhat according to age, the adults 

 are brown and metallic, with a thin darker central line on. the back, and three 

 irregular dark brown patches on each side. The legs, antennae, and caudal seta are 

 brown, the latter ringed with paler colour. The younger forms are grey, and more 

 irregularly mottled. None that I have seen are as dark as M. polypoda, and most 

 are much lighter. The head is small, the eyes black, and almost touched by the front 

 edge of the prothorax, they meet in the middle line. The prothorax is narrow and 

 cylindrical, the meso-thorax broad and elevated, the meta-thorax narrow, and partially 

 overlapped by the meso-thorax. The segments of the abdomen are nearly equal, and 

 taper gradually towards the tail. The antenna? have a thick basal joint, which is 

 followed by a whip-like portion, composed of numerous small segments, and these, 

 at the extremity, are marked off into three secondary segments, each consisting of 

 five of the smaller segments. The whole is thicker than the antenna of M. polypoda, 

 and much shorter, since, in the usual position of rest, when the antenna? are laid 

 back along the sides, they hardly extend to the end of the meta-thorax. The large 

 palpi are composed of six joints, very little (less than 1 mm.) shorter than the 

 antenna?. The second pair of palpi are short and 3-jointed, the last joint being 

 ovate. 



The legs are biunguiculate, and the last tw r o pairs bear papilliform processes on 

 the basal joint, corresponding to those described by Sir John Lubbock in M. poly- 

 podia, and which he supposes to be homologous with the abdominal appendages. The 

 central caudal seta is nearly as long as the body, being 8 mm. in length. 



