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poss. Chrysomya rufifacies - Chrysomya megacephala
This is a larger fly. It measures about 5/8" long
Tropical dry forest in NW Costa Rica six weeks into the six month dry season
Thanks Johan. I'm not sure that the marginalis is a species encountered in Costa Rica. However, you have helped me considerably narrow it down to one of the following:
Chrysomya rufifacies - Chrysomya megacephala