[Millipedes] On underside of body [Centipedes] On the sides or top of body [Trait] 
Spiracles
L e g s
L o c o m o t i o n
F e e d i n g
S p i r a c l e s
R e p r o d u c t i v e o p e n i n g s
R e p r o d u c t i v e b e h a v i o r