xt CLASSIFICATION 399 
Africa, and eight of these are natives of Britain. D. arundinacea 
is very abundant, especially in heather. It is about an eighth of 
an inch in length WD. uncinata is also often met with. 
Amaurobius, of which about eighty species are known, includes 
some species of much larger size. Three species are native to 
this country, A. ferow, A. similis, and A. fenestralis. A. ferox is 
a large and rather formidable-looking spider, more than half an 
inch in length, with powerful chelicerae. It is found under 
stones and bark, and in cellars and outhouses. A. similis is the 
commonest species in England, though 4. fenestralis somewhat 
replaces it in the north. They are smaller than A. ferox, but 
are found in similar situations. 
Fam. 18. Psechridae.—This is a sinall family of cribellate 
spiders, consisting only of two genera, Psechrus and Fecenia, and 
some eight species, all natives of Southern Asia and the adjacent 
islands. The two species of Psechrus are large spiders. They 
make large domed webs, which they stretch between trees or 
rocks, and beneath which they hang in an inverted position. 
The calamistrum of these spiders is short, about half the 
length of the fourth metatarsus. 
Fam. 19. Zodariidae (Enyoidae)—In this family are in- 
cluded a number of remarkable exotic spiders; most of them 
somewhat Drassid-like in appearance, but generally with three- 
clawed tarsi. The group appears to bea somewhat heterogeneous 
one, the twenty genera of which it consists presenting rather a 
wide range of characteristics. 
Cydrela is an African genus of moderate sized spiders, contain- 
ing five species of very curious habits. They scramble about and 
burrow in the sand, in which, according to Simon,’ they appear 
to swim, and their chief burrowing implements are their pedipalpi, 
which are specially modified, the tarsi in the female bristling 
with spines, and being armed with one or more terminal claws. 
Laches(Lachesis) includes some larger pale-coloured spiders found 
in Egypt and Syria, under stones in very hot and dry localities. 
Storena has representatives in all the tropical and sub-tropical 
parts of the world, and numbers about fifty species. They are 
of moderate size, with integuments smooth and glossy or finely 
shagreened, usually dark-coloured, with white or yellow spots on 
the abdomen. Hermippus (Fig. 206) is also African. Zodarion 
1 Hist. Nat. des Ar. i. p. 416. 
