That looks like a praying mantis egg case.

Thank-you emmayct! After searching it is confirmed:
http://www.hiltonpond.org/ThisWeek010522.html

Now, I'm not so sure they are beneficial as they will eat
anything in its path, including butterflies!

Good to know. .. thanks again!

Here is a link that might be useful: Carolina Mantis egg case

You're welcome!

We have actually had some discussion on this forum as to whether they are beneficial or not according to butterfly lovers...Most agreed they are eating machines but cool nonetheless!

Personally, I love praying mantids and think you are very lucky indeed! Maryann of CT

I love 'em, myself! I do raise them and put them out in the FRONT yard where we have Roses and Alstromeria. :)