  The recent years have witnessed a carnival of discoveries in the Outer Solar
System. Here we provide evidence from numerical simulations of orbital
stability to suggest the possible existence of two long lived belts of
primordial planetesimals in the Solar System. The first is the domain of the
Vulcanoids (between 0.09 - 0.21 AU) between the Sun and Mercury, where remnant
planetesimals may survive on dynamically stable orbits provided they possess a
characteristic radius greater than 0.1 km. The second is a belt between the
Earth and Mars (1.08 -1.28 AU) on which an initial population of particles on
circular orbits may survive for the age of the Solar System. A search through
the catalogues of Near-Earth Objects reveals an excess of asteroids with low
eccentricities and inclinations occupying this belt, such as the recently
discovered objects 1996 XB27, 1998 HG49 and 1998 KG3.
