Amastus

thumb|A. coccinator, Ecuador Amastus is a genus of moths in the family Erebidae. The genus was erected by Francis Walker in 1855.

==Taxonomy== The delimitation of Amastus versus Hemihyalea has long been problematic. It was recently determined that the type species of Hemihyalea (the old Phaegoptera cornea) is so closely related to that of Amastus (P. collaris) as to warrant inclusion in the present genus. That determination led to the reestablishment of the genus Pseudohemihyalea for the more distantly related group of species around "Hemihyalea" schausi. There is no consensus yet on whether to include the remaining Hemihyalea species in Amastus.