The blue-black grassquit is a small bird in the tanager family, Thraupidae. It was previously classified in the bunting and American sparrow family, Emberizidae. It breeds from southern Mexico through Central America, and South America as far as northern Chile, Argentina and Paraguay, and on Trinidad and Tobago. It is the only member of the genus ''Volatinia''.
Adult blue-black grassquits are 10.2 cm long and weigh 9.3 g . They have a slender conical black bill. The male is glossy blue-black,.. more