css test: adjacent siblings in safari

CSS for this page:

    .test dt:hover,
    .test li:hover {
        font-weight : bold;
    }
    .test dt:hover + dd,
    .test li:hover + li {
        color : red;
    }

Intended effect

Hovering over "boris" should bold it and turn "black and bitter" red. Hovering over any numbered list item should bold it and turn the next item red.

Test

boris: black and bitter
sasha: cute and stupid

cats are small
cats are fuzzy
dogs are hairy
dogs are of varying size

Results

Passes in Mozilla 1.7.2

Fails in Safari 1.2.4:

bolding works
adjacent siblings in definition list fail totally.
adjacent siblings in ordered list work only when scanning up the list, and then stay red until scanning down.

Validation

XHTML
CSS