This Sulphur was nectaring on a Red Shrimp plant this morning. I cannot quite place it with confidence. It is about the right size for a Large Orange Sulphur (Phoebis agarithe) but i don't feel certain about the ID. Anyone?

Phoebis agarithe maxima fits well, there is variation but the top photo is much the same as yours. Males and females often differ as you will know.

Florida
Type locality: USA (Fl)

http://www.butterfliesofameric...

http://www.butterfliesofameric...

Phoebis agarithe agarithe is also a contender, both being subspecies of the same species.

http://www.butterfliesofameric...

Type locality: Mexico:

http://www.butterfliesofameric...

Location is often the clue as to which subspecies it is.

It pays to check other Phoebis species for locality using 'find on this page' to search for Mexico.

http://www.butterfliesofameric...

Phoebis agarithe fisheri looks similar ..

http://www.butterfliesofameric...

Whichever, it looks like Phoebis agarithe.

I found a pdf, 4th link (that changes), "Butterflies of the state of Colima, Mexico - Yale University" but it's not opening for me. Phoebis agarithe agarithe is in the link,

https://www.google.co.uk/searc...

I found you can get the article via the arrow at the end of the web address, a cached version.

The google link doesn't always work, sometimes it will if refreshed. Search for "Phoebis agarithe agarithe Colima, Mexico"

Thank you Janet, there are some super links here. I did not know about the Yale Publication and will pursue it.

I hope you saw my edits on the google link.

Yes, i did and have already been there...in the process of reading some. Funny, but i never thought to search Colima butterflies. I do know of a few studies that have been done here on the aristolochia swallowtails & etc. Generally, i've had the feeling that the scientists have preferred the eastern part of the country, (veracruz, oaxaca, yucatan in that area) for their researches but your links have given me new incentive to take another look. I know there has been activity within the country. There is a govt. program CONABIO that works for the protection and identification and taxonomy of native fauna and flora. CONABIO is quite active, but boy they have a lot of rugged ground to cover! wowser! When i retired i thought i would have all the leisure time in the world to do everything i want to do...i wonder what ever happened to that idea