THE SPIDERS OF EPPING FOREST. I97 



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 (e.xcept 

 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- 



seneous .. .. .. 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 . . . . ig 



18. Legs without spines .. .. .. Pachygnathidae 



Legs with spines .. .. Tetra^nathidae 



