Microthyris prolongalis is a moth in the family Crambidae.

It is found in Brazil, the West Indies (Jamaica, the Dominican Republic, Puerto Rico, Cuba),[1] Costa Rica, Panama,[2] Belize, Honduras, Mexico, Texas and Florida.

Adults are on wing in June, October and December in Florida.

[4] The larvae have been recorded feeding on Ipomea species.

This Agroterini-related article is a stub.