Aegithus is a neotropical genus of pleasing fungus beetles (family Erotylidae) in subfamily Erotylinae.

These beetles are large by their family´s standards, and have a rounded "hump-backed" shape as adults; overall, they resemble a large plump species of ladybeetle. Their antennae are clubbed at the tips.While many species have the yellowish-and-black coloration often seen in pleasing fungus beetles, some show, more unusually for this family, bright red colors.

Among their subfamily, they seem to be a rather ancient lineage retaining many ancestral traits, such as a general lack of complicated color patterns (zigzag bands or eyespots) and larvae which feed singly on polypore fungi.

Species: Aegithus contains some 75 described species:

• Aegithus abruptus Casey, 1916
• Aegithus andreae Lacordaire, 1842
• Aegithus armitagei Gorham, 1889
• Aegithus assimilis Crotch, 1876
• Aegithus bartletti Gorham, 1889
• Aegithus bicolor Kirsch, 1865
• Aegithus binarius Casey, 1916
• Aegithus bourcieri Guérin-Méneville, 1855
• Aegithus brunnipennis Lacordaire, 1842
• Aegithus bulla Lacordaire, 1842
• Aegithus burmeisteri Lacordaire, 1842
• Aegithus cardinalis Chevrolat, 1834
• Aegithus chalybeus (Duponchel, 1825)
• Aegithus cinctipennis (Duponchel, 1825)
• Aegithus circumfusus Kuhnt, 1908
• Aegithus clathraticollis Mader, 1942
• Aegithus clavicornis (Linnaeus, 1758)
• Aegithus consularis Guérin-Méneville, 1855
• Aegithus cordatus Crotch, 1876
• Aegithus cretaceus Guérin, 1956
• Aegithus cribrosus Lacordaire, 1842
• Aegithus cyanipennis Guérin-Méneville, 1841
• Aegithus decoloratus Kuhnt, 1910
• Aegithus dichrous Crotch, 1876
• Aegithus dohrni Mader, 1942
• Aegithus dubius Gorham, 1888
• Aegithus duplicatus Gorham, 1888
• Aegithus ecuadorianus Mader, 1942
• Aegithus flavolineatus Mader, 1943
• Aegithus geminatus Lacordaire, 1842
• Aegithus globulus Achard, 1926
• Aegithus gorhami Alvarenga, 1977
• Aegithus grammicus Gorham, 1888
• Aegithus hemisphaericus Lacordaire, 1842
• Aegithus hogei Gorham, 1888
• Aegithus inflatus Crotch, 1876
• Aegithus jansoni Crotch, 1873
• Aegithus lateritius Lacordaire, 1842
• Aegithus leachi Lacordaire, 1842
• Aegithus lebasi Lacordaire, 1842
• Aegithus lineatus Guérin-Méneville, 1844
• Aegithus lineola Lacordaire, 1842
• Aegithus luridus Kuhnt, 1908
• Aegithus luteus Erichson, 1847
• Aegithus maculicollis (Duponchel, 1825)
• Aegithus melaspis Gorham, 1888
• Aegithus meridionalis Crotch, 1873
• Aegithus mesosternalis Kuhnt, 1908
• Aegithus monochrous Lacordaire, 1842
• Aegithus multistriatus Mader, 1942
• Aegithus nigrocinctus Erichson, 1847
• Aegithus olivaceipennis Mader, 1942
• Aegithus ornaticollis Lacordaire, 1842
• Aegithus pallidus Kuhnt, 1908
• Aegithus politissimus Crotch, 1876
• Aegithus politus Gorham, 1888
• Aegithus punctatissimus (Fabricius, 1775)
• Aegithus quadrimaculatus Gistel, 1848
• Aegithus quadrinotatus Chevrolat, 1834
• Aegithus rhombifer Casey, 1916
• Aegithus rubriventris Kuhnt, 1908
• Aegithus rufipennis Chevrolat, 1834
• Aegithus sanguinans Dohrn, 1880
• Aegithus satellitius Lacordaire, 1842
• Aegithus schenklingi Mader, 1942
• Aegithus scurra Lacordaire, 1842
• Aegithus stillatus Gorham, 1888
• Aegithus striatellus Crotch, 1876
• Aegithus strigicollis Gorham, 1888
• Aegithus suturella Lacordaire, 1842
• Aegithus torquatus Lacordaire, 1842
• Aegithus trilineatus Kuhnt, 1908
• Aegithus truncatus Crotch, 1876
• Aegithus uva Lacordaire, 1842
• Aegithus varicollis Lacordaire, 1842
• Aegithus walkenaeri Lacordaire, 1842