21. Eyes unlike in color or rarely absent 22. 

 Eyes either all dark or all light ■ 34. 



22. Anal tubercle enlarged and fringed with long hairs 23. 

 Anal tubercle normal 24. 



23. With a cribellum and calamistrum (except in adult males) 



Oecohiidae Oecobiids 

 No cribellum and calamistrum 

 Urocteidae Urocteids 



24. Tibia and metatarsus of lirst two legs with a regular row of alternating 



long and short spines (two long, several short, etc.) 

 Mimetidae Mimetids 

 Not so 25. 



25. Chelicerae joined together at base; tracheal spiracle situated slightly behind 



the lung spiracles 26. 



Chelicerae free; tracheal spiracle normally situated slightly before the 



spinnerets 27. 



26. Eyes grouped together on a low, median knob on the front of the cephalo' 



thorax 



Filistatidae Filistatids 

 Eyes in two to three rows; legs very long and slender 

 Pholcidae Pholcids 



27. With a cribellum and calamistrum (except in adult males) 28. 

 No cribellum and calamistrum 29. 



28. With a single row of hairs in the calamistrum 



Dictynidae Dictynids 

 With a double row of hairs in the calamistrum 

 Amanrobiidae Amaurobiids 



29. Tarsi without serrated bristles 30. 

 Tarsi of some of the legs with serrated bristles 3 1 . 



30. No basal spot on the chelicera; spinnerets two or six 



Zodariidae Zodariids 

 With a basal spot on the chelicera; spinnerets six 

 Agalemdae Funncbweb Spiders 



31. Tarsus of fourth leg with a comb (a regular row of serrated bristles) on 



the inner surface 



Theridiidae Comb-footed Spiders 

 Bristles, if present on the tarsus of the fourth leg, not so regularly ar' 

 ranged 32. 



32. No stridulating organ on the chelicera; eyes eight; making orb webs 



Argiopidae Orb Weavers 

 (Epeiridae) 

 Outer side of the chelicera with a stridulating organ (rasp-like structure) ; 

 eyes eight or rarely absent; making sheet webs 33. 



33. With spines on the legs 



Linyphiidae Sheet-web Spiders 



212 



