THE SPIDERS OF EPPING FOREST.
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distinct variety, cespiticolis, Walck, regarded by some authors as a
separate species, which is found commonly in Britain, but I have
never seen it in the Forest.
Philodromus dispar, Walck. A few specimens from near
Theydon Bois.
Philodromus margaritatus, Clk. A single specimen from
Chingford.
The following British species of Philodromus have not, up to
the present, been taken in Epping Forest:—P. fallax, Sund.;
P. elegans, Bl.; P. emarginatus, Schr.; P. constellatus, Sim; P.
clarkii, Bl.; P. variatus, Bl.; P. mistus, Bl.; P. praedatus, Cb;
P. lineatipes, Cb.
Family THOMISIDAE.
[Thomisidae, Cambr. List ad pat tem Thomisinae.]
Cephalo-thorax short and very broad, strongly constricted at the caput, which
is truncated in front. Eyes homogeneous, of the diurnal type, arranged usually
in two rows which after enclose a crescent-shaped figure. Clypeus high, more or
less vertical. Falces small, often very weak. Legs very unequal in length, those
of the first and second pairs being much the largest and strongest. Tarsal claws
two, but almost always without either claw-tuft or Scopula. Abdomen short,
broadest towards its hinder part, marked upon its upper surface with five
impressed spots which form a triangle with its apex in front. Spinners short and
compact.
This family includes all the typical crab-spiders. It is by no
means extensively represented in Epping Forest as far as our
present knowledge goes.
TABLE OF THOMISIDAE.
1. Curve of posterior row of eyes less strong than that of the
the anterior row. Lateral eyes upon a common pro-
tuberance .. .. .. .. 2
Curve of posterior row of eyes equal to, or stronger than
that of the anterior row. Lateral eyes upon separate
protuberances .. .. .. .. 4
2. Quadrangle formed by the central eyes longer than wide Pistius
Quadrangle formed by the central eyes not longer than
wide, usually wider than long .. .. 3
3. Clypeus inclined, as high as ocular area, vertical. Front of
caput angularly produced .. .. .. Thomisus
Clypeus lower than ocular area, vertical. Front of caput
obtuse, not produced .. .. .. Misumena
4. Quadrangle formed by the central eyes longer than wide .. 5
Quadrangle formed by the central eyes not longer than
wide, often wider than long .. .. .. Xysticus
5. Posterior row of eyes very strongly curved, the centrals