  A thorough search for Ultraluminous X-ray source candidates within the Local
Volume is made. The search spatially matches potential ULXs detected in X-ray
images or cataloged in the literature with galaxies tabulated in the Catalog of
Neighboring Galaxies compiled by Karachentsev et al. (2004). The specific ULX
frequency (occurrence rate per unit galaxy mass) is found to be a decreasing
function of host galaxy mass for host masses above $\sim10^{8.5}$ solar mass.
There is too little mass in galaxies below this point to determine if this
trend continues to lower galaxy mass. No ULXs have yet been detected in
lower-mass galaxies. Systematic differences between dwarf and giant galaxies
that may explain an abundance of ULXs in dwarf galaxies and what they may imply
about the nature of ULXs are discussed.
