Allegedly 4E is GM frendly in terms of game prep so I am going to give it a try.
Adventure: A spider nest in the forest is starting to attack a village.
So I am going to use Kobolds but "file the numbers off": Shifty becomes Jumpy; The javlin is replaced with a Spit attack. The +2 trap sense I'm replacing with +2 for stealth checks. Dark vision becomes tremor sense. So what does our Fell Spiders look like:
Thanks to Monster Maker 3.1 from Encounter-a-day. Also submitted to The Open Archive.
Source image from spilopterus