The number of legs will depend upon the length and therefore body segments. Usually 1 to 6 inches, in the Southeast and Southwest may grow to 8 inches. The house centipede is usually 1 to 1 inches long. They have 15 pairs of legs which makes them appear larger than they actually are. House centipedes are grayish-yellow in color with three dark brown stripes running down the back of their bodies.
Millipedes also like to live outdoors in damp areas.
Millipedes are very slow moving and if you watch them carefully enough you can easily see them moving. This pest has a round brown body with 2 pairs of legs to each body segment and range from to 1 inches long. Oh yes, they do crunch when stepped on. Chances are you will find centipedes in bath rooms, damp closets and basements. They eat other insects and are quite beneficial.