[jQuery] get tag name

[bob]

<select name="month" id="month" >
<option value="" SELECTED></option>
<option value="1" >January</option>
<option value="2"  >February</option>


function do_something_based_on_tag_name(selector) {

        if(???=='select') {}
}

var selector = jq('#month');

do_something_based_on_tag_name(selector);

How do I get tag name from "selector" variable?