Tephritid Flies

A female Tephritid fly with clear wings, probably Terellia serratulae (Diptera: Tephritidae).  Terellia longicauda is similar but has an oviscape that is as long as the adbomen.

This is a male of the same species.  Note the pale blue swellings on either side of the abdomen.  These are pheromone sacs that the males use to attract females (see here).

Photos taken in Whiteknights Park, Reading, UK, on 2012-07-13.