), in which the mandibles and maxillae
disappear." Our common white Lipura is the European L. fimetaria Linn.
(Fig. 173, copied from Lubbock). The site of the spring is indicated by
an oval scar.

[Illustration: 174. 176. 175.

Anurida maritima.]

Figure 174 represents Anurida maritima found under stones between tide
marks at Nantucket. It is regarded the same as the European species by
Lubbock, to whom I had sent specimens for comparison. This genus differs
in the form of the head from Lipura and also wants the terminal upcurved
spines, while the antennae are much more pointed. The legs (Fig. 175) end
in a large, long, curved claw. On examining specimens soaked in potash,
I have found that the mouth-parts of this species (Fig. 176,) _md_,
mandibles; _mx_, maxillae; _e_, eyes, and a singular accessory group of
small cells, are like those of Achorutes, as previously noticed by
Laboulbene. The mandibles, like those of other Poduras, end in from
three to six teeth, and have a broad, many-toothed molar surface below.
The maxillae; end in a tridentate lacinia as usual, though the palpi and
galea I have not yet studied.

The genus Anura may be readily recognized by the mouth ending in an
acutely conical beak, with its end quite free from the head and hanging
down beneath it. The body is short and broad, much tuberculated, while
the antennae are short and pointed, and the legs are much shorter than in
Lipura, not reaching more than a third of their length beyond the body.
Our common form occurs under the bark of trees.

For the reason that I can find no valid characters for separating these
three genera as a family from the other Poduras, I am inclined to think
that they form, by the absence of the spring, only a subdivision
(perhaps a subfamily) of the Poduridae.

The best way to collect Poduras is, on turning up the stick or stone on
the under side of which they live, to place a vial over them, allowing
them to leap into it; they may be incited to leap by pushing a needle
under the vial. They may also be collected by a bottle with a sponge
saturated with ether or chloroform. They may be kept alive for weeks by
keeping moist slips of blotting paper in the vial. In this way I have
kept specimens of Degeeria, Tomocerus and Orchesella, from the middle of
December till late in January. During this time they occasionally
moulted, and Tomocerus plumbeus, after shedding its skin, ate it within
a few hours. Poduras feed ordina