ARACHKOMORPH.E. 



207 



b 6 . Posterior spinners present, not shorter than 



anterior. 



a 6 . 1st leg enormously thick, with tarsus pedun- 

 culate and almost clawless Palpimanida. 



ft 6 . 1st leg typically subsimilar to the rest (larger 

 in most Attidae) ; its tarsus normal and 

 clawed. 

 a 7 . Posterior spinners enormously long and 



apically slender Hersiliidae 



b~. Posterior spinners shorter and thick. 

 a 8 . Anal papilla very large, fringed with 

 long hairs; posterior spinners much 



larger than anterior Urocteidae. 



b 8 . Anal papilla small, not fringed; pos- 

 terior spinners generally subequal to 

 the anterior. 



a 9 . Claws 3 ; no ungual tufts. 

 a 10 . Tarsus of 4th leg with comb of 



spines below Theridiidae. 



b 10 . Tarsus of 4th leg without comb of 



spines. 



a 11 . Maxillae inclined on labium ; 

 mandibles scarcely toothed; legs 



very long and slender Pholcidae. 



ft 11 . Maxillae not inclined on la- 

 bium ; mandibles toothed ; legs 

 shorter and thicker. 

 a 12 . Tarsi armed apically with 

 curved serrate spines. Seden- 

 tary web-weavers Argyopidae. 



b 1 ' 2 . Tarsi without serrate spines 



at apex. Hunting Spiders. 

 a 13 . Mandibles powerful, 

 toothed ; labium and max- 

 illae short Lycosidae. 



b 13 . Mandibles weak, weakly 

 toothed; labium and max- 

 illae long Oxyopidae. 



b 9 . Claws 2 ; ungual tufts present. 

 a 14 . Anterior spinners wide apart at 



base Gnaphosida. 



ft 14 . Anterior spinners close together 



at base. 



a 15 . Anterior median eyes enor- 

 mously large ; eyes of posterior 

 line forming a square on sides 



of head Attidce. 



b is . Eyes more normal in size and 



position. 



a 16 . Mandibles prominent, strongly 

 toothed; 3rd and 4th legs 

 not much shorter than 1st 



and 2nd Clubionidae. 



b 10 . Mandibles weak, weakly 

 toothed; 3rd and 4th legs 

 much shorter than 1st and 

 2nd , Thommda. 



