div.teasers_box, just before the opening
div for each teaser.
If more than one teaser is shown on a page, this hook fires before each of them. The position of the post is passed as a parameter if needed in actions added to this hook (targeting only the first or third posts, for example).
<div class="teasers_box"> thesis_hook_before_teaser_box <div class="post-3 post hentry category-uncategorized teaser" id="post-3">
There are no default functions added to this hook.