A detailed systematics of the siwalik Bovids has been worked out as a result of which 20 genera and 33 species have been identified. Of these, 11 species are new to science. These are: Miotragoceurs dhokpathanensis, Pachyportax ginanteus, Selenoportax dhokpathanensis, S. tatrotensis Proamphibos, dhokawanensis, Bublus bathygnathus, Antilope intermedius, Gazella padriensis.
2. Status and position of the Siwalik and some non-Siwalik genera and species has been reviewed and the following changes have been made.
i). Sterpsiportax has been synonymised with Miotragoceurs by Solounias( 1981) to which agree.
ii). Sterpsiportax chinjiensis has been synonymised with the species .S. gluten. S. gluten has been transferred to the genus Miotragocerus.
iii). Tragocerus rugosifrons is removed from Tragocerus and has been transferred to the genus Tragoportax.
iv) Tragocerus browni, which had been transferred to Miotragocerus by Gentry (1974) and to Tragoportax by Solounias(1981) has been resurrected.
v). Pachyportax latidens var . dhokpathanensis has been regarded as invalid.
vi). Selenoportax lydekkeri which was considered doubtful by Gentry (1974) has been regarded as a valid species of the genus.
vii) Protragocerus .gluten-praecox (pilgrim) gentry (1974) has been regarded invalid and Helicoportax praecox has been resurrected.
viii). Helicoportax, which was synonymised with Protragocerus by gentry (1970), with Miotragocerus by Solounias (1981) has been resurrected.
ix) Tragoportax islami which was considered by gentry (1970) to be doubtful, has been regarded as a valid species of the genus Tragoportax.
x). The sub-genera Bison( Bison), B. (Simobison), B. (Superbison), B. (Platycerboison), B. (Giantobison) and B. (parabison) may be regarded as invalid and the genus Bison in treated as full genus.
3. The Following material is being described for the first time in following species. i). P2 M1 in Phachyportax latidens. ii). A fragment of the right horn-core in Ruticeros pugio. iii). P4-M1 in Bison sivalensis iv). M1 in Antilope subtorta.
4. Probable evolution, migration and extinction of the Siwalik forms have been discussed. The salient features are: i). Pachyportax originated in Siwalik region. Pachyportax nagrii has been regarded as the most primitive species of the genus. ii). Selenoportax originated in the Siwalik region and S. vexillarius has been regarded as the most primitive species of the genus. iii). Proamphibos originated in Siwalik region. P. lachrymans has been regarded as the most primitive species of the genus. iv). Bubalus originated in the Siwalik region. It is absent Europe and Africa. The hitherto referred material from Africa by Duvernoy(1851), Seeley (1891) and Lonnberg (1933) has been transferred t the genus Pelorovis by Gentry (1978) to which I agree. v). Bison originated in Asia probably in the Siwalik region. Bison crassicornis has been regarded as the most primitive species of the genus vi) Antilope originated in the Siwalik region and A. planiscornis is the most primitive species of the genus.