Hydrachnellae 265 



13. Palpi in general narrow; palpal segment ii seldom clublike, not 

 longer than segment iv; segment iv as long or usually longer than 

 segment ii; dorsal length of palpal segment ii never equals seg- 

 ments III plus IV, but III plus IV longer than segment ii 14 



Palpi short and clublike; palpal segment ii especially thick and 

 strong; palpal segment iv shorter than segment ii; dorsal length 

 of segment ii same or longer than segments in plus iv; cheliceral 

 claw proportionately small Mamersopsidae 



14. Palpal segment iv without sclerotic process on inner side; segment 

 II usually with pegs or spines on inner side; skin without thick, 

 spiny sclerotic plates 1 5 



Palpal segment iv dorsally-distally elongated; segment ii without 

 appendage, peg, or spine on inner side; skin densely covered with 

 thick-shafted, many-pointed, spiny sclerotic plates 



Pseudohydryphantidae 



15. Epimera in four groups of two each; these groups (at least second 

 and third) separated from one another by skin areas 16 



Epimera united into one group, often medianly united with one 

 another; laterally epimera ii and iii completely united without 

 suture or only partial suture present; genital plates fit snugly into 

 epimera iv without free ventral skin being present 18 



16. No gland on epimera iv 17 

 Large, glandular organ on anterior median corner of epimera iv 



Teutoniidae 



17. Lateral eyes united in eye capsules; palpal segment ii with spine- 

 covered projection on inner side; legs iv with claws Sperchonidae 



Lateral eyes not united in capsules but separated from each other 

 by skin; palpal segment ii only with spines on inner margin; legs 

 IV without claws Anisitsiellidae 



18. Epimeral region not fused with ventral region and genital organ 

 therefore not enclosed; ventral region behind genital organ unar- 

 mored and membranous; dorsum as a rule not sclerotized; dorsal- 

 ventral suture lacking; with six (seldom four) large genital suckers 



Lebertiidae 



Epimeral region forming with venter (including genital organ) 

 ventral armor which is closed behind genital organ; this extends 

 laterally around body to dorsum where it is separated from dorsal 

 shield by dorsal suture; genital organ with twelve small genital 

 suckers under inner margin of genital flaps Atractideidae 



