@Setanta,
Using the bug identifier here:
http://www.insectidentification.org/
Black body with blue as a secondary color, found in Texas, and I can only assume it has 6 legs.
It appears it is an American Oil Beetle. They are dull, no wings and slow moving.
Since it seems it's also seen in the DC area you need to pay attention to the disclaimer on the page.
*Since insects do not obey man-made borders, they may appear in areas/regions/states beyond those listed above.