Sitemap CP -> Blank Categories (rewrite not working)

[StudioZ]

Was recently checking through my Google Webmaster Tools, to see if the SEO was OK with my logotypes.ca website...
Realized that there was a whole bunch of crawl errors [ 404 (Not found) ]

A quick question ...
When you create new unnamed (no alias) Sections (Categories) that you prefer being automagicaly numbered by the system like:
http://www.logotypes.ca/design/id=220.phtml
http://www.logotypes.ca/design/id=221.phtml
http://www.logotypes.ca/design/id=222.phtml
etc. ...
These appear in the Sitemap as this:
http://www.logotypes.ca/design/220.phtml
http://www.logotypes.ca/design/221.phtml
http://www.logotypes.ca/design/222.phtml
etc. ...
and thus produce 404 error pages, leading nowhere ...

How could I modify the .htaccess file so that the missing "id=" part is added the urls ?

Thanks,

Yves