Asilidae Latreille, 1804
Efferia abdominalis (Wiedemann, 1821)
Efferia aestuans (Linnaeus, 1763)
Efferia affinis (Bellardi, 1861)
Efferia albibarbis (Macquart, 1838)
Efferia albispinosa (Macquart, 1850)
Efferia alia Scarbrough & Perez-Gelabert, 2009
Efferia amarynceus (Walker, 1849)
Efferia amazonica (Bromley, 1934)
Efferia amphissa (Walker, 1849)
Efferia anacapai (Wilcox & Martin, 1945)
Efferia angusta Scarbrough & Perez-Gelabert, 2009
Efferia anomala (Bellardi, 1861)
Efferia antiochi Wilcox, 1966
Efferia antiphon (Walker, 1849)
Efferia anza Forbes, 1988
Efferia apache Wlicox, 1966
Efferia aper (Walker, 1855)
Efferia apicalis (Wiedemann, 1821)
Efferia argentifascia Enderlein, 1914
Efferia argentifrons (Hine, 1911)
Efferia argygogaster (Macquart, 1846)
Efferia argyrosoma (Hine, 1911)
Efferia arida (Williston, 1893)
Efferia armata (Hine, 1918)
Efferia auribarbis (Wiedemann, 1821)
Efferia aurimystacea (Hine, 1919)
Efferia auripila (Hine, 1916)
Efferia aurivestitus (Hine, 1919)
Efferia azteci Wilcox, 1966
Efferia badiapex (Bromley, 1928)
Efferia barbiellinii (Curran, 1935)
Efferia bardyllus (Walker, 1849)
Efferia basingeri Wilcox, 1966
Efferia basini Wilcox, 1966
Efferia beameri Wilcox, 1966
Efferia belfragei (Hine, 1919)
Efferia bellardii Scarbrough, 2008
Efferia benedicti (Bromley, 1940)
Efferia bexarensis (Bromley, 1934)
Efferia bicaudata (Hine, 1919)
Efferia bicolor (Bellardi, 1861)
Efferia bilineatus (Wulp, 1882)
Efferia bimaculata (Bellardi, 1861)
Efferia bromleyi Scarbrough, 2008
Efferia brunnescens (Bromley, 1929)
Efferia bryanti Wilcox, 1966
Efferia bullata Scarbrough & Perez-Gelabert, 2009
Efferia cabeza Wilcox, 1966
Efferia calienta Wilcox, 1966
Efferia caliente Wilcox, 1966
Efferia californica (Schaeffer, 1916)
Efferia camposiana (Curran, 1931)
Efferia cana (Hine, 1916)
Efferia candida Coquillett, 1893
Efferia cannella (Bromley, 1934)
Efferia carinata (Bellardi, 1861)
Efferia caudex (Walker, 1849)
Efferia caymanensis Scarbrough, 1988
Efferia cazieri (Curran, 1953)
Efferia cellatus (Schiner, 1868)
Efferia cerdai Tomasovic, 2002
Efferia chapadensis (Bromley, 1928)
Efferia cingulata (Bellardi, 1861)
Efferia clavata Scarbrough & Perez-Gelabert, 2009
Efferia clementei (Wilcox & Martin, 1945)
Efferia cockerellorum (James, 1953)
Efferia commiles (Walker, 1851)
Efferia completa (Macquart, 1838)
Efferia concinnata (Williston, 1901)
Efferia coquilletti (Hine, 1919)
Efferia coquillettii (Hine, 1919)
Efferia costalis (Williston, 1885)
Efferia coulei Wilcox, 1966
Efferia cressoni (Hine, 1919)
Efferia cubensis (Bromley, 1929)
Efferia cuervana (Hardy, 1943)
Efferia currani (Bromley, 1951)
Efferia davisi Wilcox, 1966
Efferia demifasciata (Macquart, 1850)
Efferia deserti Wilcox, 1966
Efferia dilecta (Walker, 1855)
Efferia dubia (Williston, 1885)
Efferia duncani Wilcox, 1966
Efferia ehrenbergi Wilcox, 1966
Efferia eraxoides (Curran, 1935)
Efferia eurylaris (Wiedemann, 1828)
Efferia exacta Scarbrough & Perez-Gelabert, 2009
Efferia eximia (Bellardi, 1861)
Efferia femorata (Macquart, 1838)
Efferia flavida (Wiedemann, 1828)
Efferia flavofasciata (Wiedemann, 1828)
Efferia forbesi (Curran, 1931)
Efferia fortis (Walker, 1855)
Efferia frewingi Wilcox, 1966
Efferia fulvibarbis (Macquart, 1848)
Efferia fusca (Wiedemann, 1828)
Efferia fuscanipennis (Macquart, 1850)
Efferia fuscipennis (Macquart, 1847)
Efferia garciai Lamas, 1971
Efferia gila Wilcox, 1966
Efferia gossei Farr, 1965
Efferia grandis (Hine, 1919)
Efferia halli Wilcox, 1966
Efferia haloesus (Walker, 1849)
Efferia halterata Enderlein, 1914
Efferia harveyi (Hine, 1919)
Efferia helenae (Bromley, 1951)
Efferia heteropterus (Macquart, 1846)
Efferia hinei Scarbrough, 2008
Efferia hubbelli (James, 1953)
Efferia hyalipennis (Macquart, 1838)
Efferia imbuda (Curran, 1934)
Efferia imperialis Forbes, 1988
Efferia incisura Scarbrough & Perez-Gelabert, 2009
Efferia incognita Forbes, 1987
Efferia inflata (Hine, 1911)
Efferia insula Scarbrough, 2008
Efferia intermedius Lamas, 1971
Efferia jubata (Williston, 1885)
Efferia kansensis (Hine, 1919)
Efferia kelloggi Wilcox, 1966
Efferia knowltoni (Bromley, 1937)
Efferia kondratieffi Bullington & Lavigne, 1984
Efferia labidophora (Wiedemann, 1828)
Efferia lades (Walker, 1849)
Efferia lasciva (Wiedemann, 1828)
Efferia latiforceps (Bromley, 1928)
Efferia latruncula (Williston, 1885)
Efferia lesbius Lamas, 1971
Efferia leucocoma (Williston, 1885)
Efferia loewi (Bellardi, 1862)
Efferia luna Wilcox, 1966
Efferia macrolabis (Wiedemann, 1828)
Efferia macroxipha Forbes, 1988
Efferia macularis (Wiedemann, 1821)
Efferia marginata (Bellardi, 1861)
Efferia mediana (Wiedemann, 1828)
Efferia mellina (Wiedemann, 1828)
Efferia mesquite (Bromley, 1951)
Efferia mexicana (Hine, 1919)
Efferia minor (Macquart, 1847)
Efferia monki (Bromley, 1951)
Efferia montensis Scarbrough & Perez-Gelabert, 2009
Efferia mortensoni Wilcox, 1966
Efferia murina (Philippi, 1865)
Efferia mygidon (Walker, 1851)
Efferia nemoralis (Hine, 1911)
Efferia neoinflata Wilcox, 1966
Efferia neosimilis Forbes, 1987
Efferia nigerina (Wiedemann, 1821)
Efferia nigripes (Macquart, 1850)
Efferia nigritarsis (Hine, 1919)
Efferia obscura (Macquart, 1838)
Efferia ordwayae Wilcox, 1966
Efferia pachychaeta (Bromley, 1928)
Efferia pallidula (Hine, 1911)
Efferia parkeri Wilcox, 1966
Efferia parva (Walker, 1855)
Efferia parvula (Bellardi, 1861)
Efferia patagoniensis (Macquart, 1850)
Efferia pavida (Williston, 1901)
Efferia peralta Wilcox, 1966
Efferia pernicis Coquillett, 1893
Efferia picea Scarbrough & Perez-Gelabert, 2009
Efferia pictipennis (Schiner, 1868)
Efferia pilosa (Hine, 1919)
Efferia pilosula (Bromley, 1929)
Efferia pina Scarbrough, 2008
Efferia pinali Wilcox, 1966
Efferia plena (Hine, 1916)
Efferia poecilolampra (James, 1953)
Efferia pogonias (Wiedemann, 1821)
Efferia portoricensis (Hine, 1919)
Efferia prairiensis (Bromley, 1934)
Efferia prattii (Hine, 1919)
Efferia producta (Hine, 1919)
Efferia prolifica (Osten Sacken, 1887)
Efferia propinqua (Bromley, 1928)
Efferia pulchripes (Bromley, 1928)
Efferia pumila (Macquart, 1850)
Efferia pyrrhogona (Wiedemann, 1828)
Efferia quadrimaculata (Bellardi, 1861)
Efferia rapax (Osten Sacken, 1887)
Efferia remus Tomasovic, 2002
Efferia rubidiventris (Macquart, 1850)
Efferia rufina (Wiedemann, 1819)
Efferia rufipes (Macquart, 1838)
Efferia rufithorax (Macquart, 1846)
Efferia rufitibia (Macquart, 1848)
Efferia sagax (Williston, 1901)
Efferia satyrus Lamas, 1971
Efferia schadei (Bromley, 1951)
Efferia senilis (Wiedemann, 1828)
Efferia serrula Scarbrough & Perez-Gelabert, 2009
Efferia setigera Wilcox, 1966
Efferia sicyon (Walker, 1849)
Efferia similis (Williston, 1885)
Efferia singularis (Macquart, 1838)
Efferia sinuosa Scarbrough & Perez-Gelabert, 2009
Efferia slossonae (Hine, 1919)
Efferia snowi (Hine, 1919)
Efferia sonorensis Forbes, 1987
Efferia speciosa (Philippi, 1865)
Efferia spiniventris (Hine, 1919)
Efferia spinula Scarbrough & Perez-Gelabert, 2009
Efferia splendens (Williston, 1901)
Efferia staminea (Williston, 1885)
Efferia stigmosa (Carrera & Andretta, 1950)
Efferia stimicon (Walker, 1851)
Efferia stylata (Fabricius, 1775)
Efferia subappendiculata (Macquart, 1838)
Efferia subarida (Bromley, 1940)
Efferia subchalybea (Bromley, 1928)
Efferia subcuprea (Schaeffer, 1916)
Efferia subpilosa (Schaeffer, 1916)
Efferia suspiciosa Scarbrough & Perez-Gelabert, 2009
Efferia tabescens (Banks, 1919)
Efferia tagax (Williston, 1885)
Efferia texana (Banks, 1919)
Efferia titan (Bromley, 1934)
Efferia tolandi Wilcox, 1966
Efferia tortola (Curran, 1928)
Efferia tricella (Bromley, 1951)
Efferia triton (Osten Sacken, 1887)
Efferia truncata (Hine, 1911)
Efferia tuberculata (Coquillett, 1904)
Efferia tucsoni Wilcox, 1966
Efferia utahensis (Bromley, 1937)
Efferia varipes (Williston, 1885)
Efferia vauriei (Curran, 1953)
Efferia velox (Wiedemann, 1828)
Efferia vertebrata (Bromley, 1940)
Efferia vinalensis Scarbrough, 2008
Efferia wilcoxi (Bromley, 1940)
Efferia willistoni (Hine, 1919)
Efferia woodleyi Scarbrough & Perez-Gelabert, 2009
Efferia yermo Wilcox, 1966
Efferia yuma Wilcox, 1966
Efferia zetterstedti (Jaennicke, 1865)
Efferia zonata (Hine, 1919)