[4] The author cites an earlier name, Halmaturus greyii, published by John Edward Gray in 1843 without a valid description, assigning it to a subgenus of the same name—Macropus (Halmaturus)—and providing the common name of the newly described species as Grey's wallaby.

[5][6] The common name and epithet greyi commemorates the collector and explorer George Grey, who provided the two specimens to researchers at the British Museum of Natural History.

[10] The toolache wallaby was a slim, graceful, and elegant creature that had a pale ashy-brown pelt with a buff-yellow underbelly.

[11] Their movements were unusual and extremely rapid, able to outpace almost any terrestrial predator; they were known to evade the fastest dogs of the colonial hunters.

[6] The toolache wallaby occupied the southeastern corner of Australia to the western part of Victoria.

Besides the destruction of its habitat, the introduction of predators, such as the European red fox, began to kill off the species as well.

[2] The species is presumed to be extinct, although extensive research is still being conducted in the region after reports of suspected sightings through the 1970s.