The quest that I received for this was Rhian's Dyes. It's got the same kills, and presumably the same reward, but I'm not done yet. As an update, I got no dye, but I did happen to see Large Eirebugs in Lough Derg at location 8.9, 50.2 so no need to go way up to Connacht. Can't confirm you get credit for quest kill, but worth a try.
Edited, Aug 22nd 2007 2:06:04pm by Friml