You should still be able to do it through iPhoto (or Image Capture would work as well).
If you want a quick way to do it on your phone:
-open the Photos app, then go to the Photos tab on bottom left.
-once there, make sure you're in the Moments view (not Collections or Years).
-tap Select at the upper right. This allows you to select many photos at once by choosing one of the date ranges.
-after you've selected the date range you want to delete, tap the trash can icon at lower right.
Hope that helps!
02-09-2014 09:14 AM