P. tigrinawesseli which was previously known in the hobby as Poecilotheria sp. "tigris" is a new species found in 2004 in northeastern India. This species has similar colouring to P.formosa though it is infact more closely related to the darker P.miranda. These species has been described in 2006 by Andrew Smith in the May BTS Journal.
Smith, A.M. 2006. A new species of Poecilotheria from northeast peninsular India (Araneae, Mygalomorphae, Theraphosidae) with notes on its distribution and conservation status. Journal of the British Tarantula Society 21(3): 83-94 [p. 86, pl. 1-2, f. 1-20].
Gabriel, R. 2011. Poecilotheria formosa, P. metallica, P. miranda and P. tigrinawesseli: Notes and observations on their captive breeding, maturity rate and sociability. Journal of the British Tarantula Society 26(3): 101-110.