1

• Tail very thick, thicker than chela. Chela slender and round in cross section....... Buthidae
• Tail thinner than chela. Chela large and flattened in cross section....... Scorpionoidea (2)

2

• Tail similar to legs in thickness ........Ischnuridae (3)

• Tail thicker than legs........(4) 

3

• Body extremely flattened dorsoventrally. Legs and tail flattened. Dark brown scorpions occurs in rocky habitat.......Hadogenes 

• Body not flattened or only slightly. Blackish and occurs in moist habitats and forests……Opisthacanthus

4

• Chela much thicker than tail, yellow to brown and in burrows....... Scorpionidae: Opistophthalmus
• Chela only slightly thicker than relatively thick tail……Bothriuridae: Lisposoma