Scientists used to think that it was a direct mimic, now they know that the Viceroy is also bad tasting.
When I see a new species, I go to the USGS, butterflies page and look to see if it is listed:http://www.butterfliesandmoths.org/map?ds=44&_dcs=1
Are you in Harris county? I looked up the country for Houston.http://www.butterfliesandmoths.org/map? ... cc=1&si=44
You have to learn the families to look up the butterflies. Viceroys are the Admiral family.http://www.butterfliesandmoths.org/spec ... e=48*Texas
According to the map, they have been seen in your area.
Look at the caterpillars hosts plants, habitat, nectar preference...
The caterpillars don't scream, I'm here, but if you look for them on the hosts you just might find them.
If the butterfly was not listed in your area, then you could consider it a record and post it on the record list:http://www.butterfliesandmoths.org/faq/report