Wikipedia
Ornithoctoninae, also known as earth tigers, are a subfamily of Asian tarantulas, which were first erected in 1895 by Reginald Innes Pocock on basis of the genotype Ornithoctonus andersoni described in 1892 from former Burma, now Myanmar.
The Ornithoctoninae is a theraphosid sub-family, which are widely distributed in Asia from Myanmar to South China in the north and as far as to Halmahera in the Indonesian archipelago in the south, and in all the ranges in between. Most species in the subfamily live fossorially in burrows, though there are several species which are living arboreally in trees. They are known as defensive spiders; when disturbed they will quickly retreat into their burrows or dig themselves into the soil. When neither is a possibility, they will assume a defensive posture. When provoked, they will strike the aggressor repeatedly with the anterior legs; if the aggressor does not retreat these spiders has been known to bite. Though not deadly, the effects of the venom can be very unpleasant including pain, swelling and arthritis like stiffness in the joints of the extremity affected.
The theraphosid subfamily Ornithoctoninae is defined by the following combination of characters. Presence of retrolateral scopula of filiform setae on the cheliceral base. a small row of larger filiform paddle setae retrolaterally ventro-basally in connection to the retrolateral cheliceral scopula. Arrangement of stridulatory spines prolaterally on maxilla. The character of retrolateral scopula of filiform setae on the cheliceral base is shared by the African subfamily Harpactirinae, but the Ornithoctoninae can be distinguished from the Harpactirinae by the geographic distribution range and the presence of the other characters mentioned, which are lacking in the Harpactirinae.