Thanks Tim and Steve,
Steve, you are correct according to the ranges given in Clements (who I notice has changed the generic name from Columba to Patagioenas for the New World in line with the AOU). If the birds are Plumbeous they will be of the pallescens sub-species or if they Ruddy they will be of the bogotensis sub-species.
Unfortunately, I don't have any descriptions at the sub-species level.
Thanks for the warm welcome BTW