THE SPIDERS OF EPPING FOREST. 197
Eyes small, very widely separated, the posterior
laterals being placed far back upon the
caput .. .. .. .. Eresidae
9. Width of ocular area greater than its length.
Eyes not greatly unequal in size .. 10
Width of ocular area not greater than its
length. Eyes very unequal in size .. 24
10. Tarsal claws 2 .. .. .. 11
Tarsal claws 3 .. .. .. 16
11. Inferior spinners well separated at their bases.. Drassidae
Inferior spinners set close together at their bases 12
12. Eyes homogeneous, of the diurnal type. Pos-
terior row recurved. Legs of second pair
longer than those of the first and often than
those of the fourth. Clypeus moderately
high .. .. .. .. 13
Eyes usually distinctly heterogenous (except
Sparassidae). Posterior row often pro-
curved. Legs of second pair shorter than
those of the first and fourth pairs.
Clypeus low .. .. .. 14
13. Legs I and II much longer than legs III and
IV. Tarsi without scopulae .. .. Thomisidae
Legs not greatly unequal. Tarsi with scopulae Philodromidae
14. Tube tracheae opening in a very distinct trans-
verse impression_ near the centre of the
abdomen .. .. .. Anyphaenidae
Tube tracheae opening just in front of the
spinners, the aperture being small and
inconspicuous .. .. .. 15
15. Labium rather long. Eyes distinctly hetero-
geneous .. .. .. Clubionidae
Labium very short, almost semi-circular. Eyes
almost homogeneous .. .. Sparassidae
16. Spinners short and arranged in a compact
group .. .. .. .. 17
Spinners of superior pair long, consisting of
more than one joint .. .. 22
17. Genital aperture placed some considerable dis
tance behind the openings of the laminal
tracheae .. .. .. 18
Genital aperture placed between the openings
of the laminal tracheae .. .. 19
18. Legs without spines .. .. .. Pachygnathidae
Legs with spines .. .. Tetragnathidae