590 
MR. LUBBOCK ON THE THYSANURA. 
situated, as usual, on a black ground ; and near the central line, a little in front of the 
antenna?, is a black double spot, which looks like the seat of two ocelli. At the same 
time I did not obtain by dissection any further evidence that these spots were really in 
any way connected with vision. 
The two claws are simple, but they differ in form (PL LIX. fig. 2) from those of any 
other species which I have examined. The feet also are provided (perhaps to make up 
for the simplicity of the claws) with four or five tenent hairs. 
The saltatory appendage is somewhat like that of S. Buskii, but less hairy, being 
indeed almost naked; the terminal lamellae, however (PL LIX. fig. 3), are different in 
form. There are no tenent hairs. 
I at first supposed that these specimens might be the young of some already described 
species ; but I have never found any larger ones, and they differ in form as well as in 
colour from all the other representatives of the genus. 
Smyntiiurtjs fusctjs, Lat. This species, which is probably the same as that mentioned 
by Templeton under the name of S. ater, is the only one hitherto recorded as occur- 
ring in England (Sam. Ent. Compend., p. 141). 
PODURID^]. 
This family comprises those species of the old genus Podura, in which the mouth has 
mandibles, and the body is elongated, with a more or less developed saltatory appendage 
at the posterior extremity. 
Before proceeding to describe the species which have come under my notice, it may 
be convenient that I should give a short description of the genera into which they are 
distributed. 
1. Orchesella, Templeton. Segments of the body unequal in size, more or less thickly 
clothed by clubbed hairs. Antennae long, six-jointed. Eyes six in number on each 
side, arranged in the form of an S. 
The structure of the antennae makes this genus very easy to recognize. 
2. Degeeria, Nicolet. Segments of the body unequal in size, more or less thickly 
clothed by clubbed hairs, and sometimes also provided with scales. Antennae 
longer than the head and thorax, filiform, four-jointed. Eyes eight in number, on 
each side of the head. 
cS. Templetonia, n. g. Segments of the body subequal, clothed by clubbed hairs, and 
provided with scales. Antennae longer than the head and thorax, five-jointed, with 
a small basal segment, and with the terminal portion ringed. 
4. Isotoma, Bourlet {Desoria, Nicolet). Pour anterior abdominal segments subequal, 
two posterior small ; body clothed with simple hairs, and without scales. Antennae 
four-jointed, longer than the head ; segments subequal. Eyes seven in number 
on each side, arranged in the form of an S. 
5. Macrotoma, Bourlet (Tomocerus, Nicolet). Abdominal segments unequal, with 
