Summarized from Brake (2000)
The Milichiidae are a monophyletic family (Click here for phylogenetic tree).
Apomorphic characters for the Milichiidae are:
Classification: Aldrichiomyza; Borneomyia; Costalima; Desmometopa; Enigmilichia; Eusiphona; Leptometopa; Leptometopa niveipennis; Litometopa; Madiza; Madizinae; Microsimus; Milichia; Milichia distinctipennis; Milichia speciosa; Milichiella; Milichiella freyi; Milichiella nigeriae nigeriae; Milichiella populi; Milichiella sp. B; Milichiella sp. K; Milichiella tosi; Milichiinae; Neophyllomyza; Paramyia; Paramyioides; Pholeomyia; Pholeomyia nigricosta; Phyllomyza; Phyllomyzinae; Platophrymia; Stomosis; Ulia; Xenophyllomyza; Acartophthalmidae; Australimyzidae; Carnidae; Chloropidae; Milichiidae; Tethinidae
The question of whether the Carnidae is a subfamily of the Milichiidae or a separate family has for long been a subject for discussion. The reason for this is the similarity between the carnid genera Meoneura and
Hemeromyia, and several Madizinae. Both groups are characterised by the presence of two medioclinate "frontal" setae and two lateroclinate orbital setae. This condition is unique in the Schizophora.
Classification: Carnus; Madizinae; Meoneura; Carnidae; Chloropidae; Milichiidae
Glossary: Orbital seta
The Robber Fly is Promachus albifacies, the prey is a native bee of the genus Agapostemon female, the ant is a Pogonomyrmex and of course the fly is another member of the Chloropidae. This photo taken on my property Hereford Arizona at five thousand feet elevation, Huachuca Mountains.
This image shows a female Efferia bryanti with its prey a Pentatomidae. The Freeloader walks all over the asilid and I believe remains attached even when the Predator flies some distance(at least if it transports its prey.
This population of Efferia bryanti is located between Paradise and Portal in Cochise County AZ.