A new species, Sarcophaga (Sarcorohdendorfia) maxima sp. nov., supported by both morphological and DNA barcoding data, is described from Queensland and New South Wales, Australia. The major morphological features of the new species are listed, and the male terminalia are documented with both photography and scanning electron microscopy. Sarcophaga alcicornis Hardy, 1932 is transferred from subgenus Lioproctia Enderlein to Sarcorohdendorfia Baranov.