2 
[Juno 
This little animal differs ehiedv from L. ambulans (L.) in colour, 
and 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 Lip nr a 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 Ma chilis 
unknown to me ; at that time I had not carefully studied the genus, 
and so referred them to the species polypoda (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 towai’ds 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 antennae are laid 
back along the sides, they hardly extend to the end of the meta-tliorax. The large 
palpi are composed of six joints, very little (less than 1 mm.) shorter than the 
antennae. The second pair of palpi are short and 3-jointed, the last joint being 
ovate. 
The legs are biunguiculate, and the last two pairs bear papilliform processes on 
the basal joint, corresponding to those described by Sir John Lubbock in M. poly- 
poda, and which he supposes to be homologous with the abdominal appendages. The 
central caudal 3 eta is nearly as long as the body, being 8 mm. in length. 
