Observation notes: The buttterfly was seen at St. Marks NWR on the dike at Lighthouse Pond on the dike closest to the Gulf of Mexico. The butterfly was first sighted by Sally Jue and she recognized it as perhaps being a Cassius Blue because of its constant and erratic flight, only stopping very briefly on vegetation before flying again, a behavior that is very similar to Cassius Blue individuals that we have observed previously in south Florida. The primary nectar plant in the vegetation patch where the butterfly was flying Bidens alba (Spanish Needle). The butterfly also acted as if it were trying to oviposit on a legume species a few times. Rich Howard took the picture of the Cassius Blue ovipositing. The weather was sunny and warm.