Sorry did the search right this time, will share the page: www.umex.edu/ces/whort/gardenfacts/XHT 10.. (It's a pale pink and smaller).
Now have to figure out what other pest in eating in my bed.

The iris borer caterpillar is a very pale pink - not green. The head is light brown.

Iris borers will not hatch until the days turn warm enough for 2 consecutive 70 degree + days. That doesn't happen here until at least April. Plus it takes them a couple months to grow to 1-1/5 inches.
You got some other kind of bugger!
Laetitia

Here is a picture I found when searched for iris borer

Here is a link that might be useful:

Good picture, but don't be fooled by the pink color. Many times they are cream colored.
Laetitia