Perhaps not a very short process, but shorter.
Highlight one of the emails you want to delete, then hold down Shift (and keep it down) and press the up or down arrow on the keyboard to highlight adjacent emails. After selection, release Shift. Right click highlighted area and select Delete.
For selection of non-adjacent emails, click on one email to highlight it, then hold down CTRL and click to select any other emails you want to delete. Right click and delete.