Estheria cristata (Garden Chafer Parasite Fly) Hutchinson's bank - I have never seen the host at Hutchinson's bank

From Steve Falk
A medium-sized (body length 8.5-10.5 mm) densely grey-dusted tachinid with bare eyes, a plumose arista and a short petiole (shortest than cross vein r-m) at the end of wing cell R4+5. The vibrissae are inserted well above the mouth edge, the jowls and parafacialia are very broad and eyes relatively small. There is no strong longitudinal ridge between the antennae in contrast to Dexia and Dinera species. The thoracic dorsum has four dark vittae and 3 pairs of postsutural dorsocentrals. The scutellum has a reddish ground colour. The abdomen has shifting dark markings. The legs are dark with brownish tibiae. The male frons is about one-eighth the head width, that of the female about two-fifths. The much rare E. bohemani is similar but has four pairs of postsutural dorsocentrals, a dark scutellum and the wing petiole about twice as long as cross-vein r-m.

E. cristata is a scarce species of southern Britain with records extending thinly north to Cumberland. It is found on dunes, downland and heathland. Adults fly in July and August and visit flowers such as ragworts, umbellifers and Yarrow. The larvae develop as internal parasitoids of the Garden Chafer Phyllopertha horticola.

NBN map:
species.nbnatlas.org/species/NBNSYS0000030055