186 POMONA COLLEGE JOURNAL OF ENTOMOLOGY 



5. A large tooth on lower edge of movable finger of mandibles ; long 

 hairs on legs and pedipalpi ; about 30 pectines, or more ; last dorsal 

 segment without distinct keels : all caudal segments with keels below ; 



fingers of hand longer than hand ( Fig. 81, F D) Hadntrns hirsiitiis. 



No such tooth on movable finger of mandibles ; less hairy forms ; last 

 dorsal segment more or less distinctly keeled 6 



6. Middle lamellje of pectines broken up into many small subequal 



sclerites ; usually at least 15 pectines; colors rather pale 8 



Middle lamellae of pectines not broken up ; pectines rarely more than 



10 or 12 ; colors very dark 7 



Figure 80. Anatomical details of a Scorpion. 



7. Movable finger of mandible with at least 5 small teeth ; stigmata 

 rather short; fourth .segment of cauda keeled below; about 10 or 12 



pectines; sting of male normal. (Fig. 81, E) Uroctoiius inordax. 



Movable finger of mandibles with not more than three small teeth ; 

 stigmata very slender ; fourth segment of cauda without keels below ; 



about 7 pectines; sting of male swollen near liasc. (Fig. 81, H) 



AtttiroctouHS plntiodactylus. 



