What kind of butterfly is this?

I found it in my backyard and it was dead but I notice these types of insects in my backyard flying around all the time so I was just wondering what they were but, what type of insects are these?

Here's a picture of it's caterpillar form:

http://imageshack.us/a/img42/5940/060810165401.jpg

They are always out during the spring time crawling up the house to make their cocoons.

Here's it's butterfly form:

http://imageshack.us/a/img718/8243/0616101111001.j...

And this is what I found in the backyard of the same creature:

http://imageshack.us/a/img842/2107/qfj8.jpg

Thanks! :)