In Costa Rica, the local population of monarchs travel between the east and west coasts of the country, and do not intermingle with the populations from the United States or Canada.
According to funet the Monarch is found on the whole continent:
http://www.nic.funet.fi/pub/sci/bio/life/insecta/lepidoptera/ditrysia/papilionoidea/nymphalidae/danainae/danaus/index.html#plexippus
Look at these shots, I guess the ID is correct:
http://www.flickr.com/photos/baztoune/6007119386/
http://www.flickr.com/photos/eduardomena/5156241013/
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