I have found a dead moth in my porch, and can't find out what species it is. How do i find out?

Question:The moth has yellow wings with back identical lines all over it. It looks a bit like stained glass. And also has a stained glass head with 3 dimonds on it and a pair of extra red wings with black spots on it underneath the yellow and black wings. It has black antena, and is 4.5 cm long, and 2 cm wide.

Answers:
Go to a library and look it up