Odonestis pruni

This individual has
Bright red rounded wings (not triangular).
Both wings with slightly dentate margins.
Black post-medial line is fine and strongly concave. Ante-medial line is also strongly concave.

Sergeev, A. I. & V. V. Zolotuhin. 2009. A review of the genus Odonestis Germar, 1812 with descriptions of two new species and one new subspecies (Lepidoptera, Lasiocampidae).
Atalanta 41 (3/4): 375-396. Pg. 388. Pl. 14/7-9.

Based on above paper, the species of Odonestis from N. India are
Odonestis pruni oberthueri Nepal, NE India
http://www.lepiforum.de/lepiwiki.pl?Odonestis_Pruni
Could be pruni as post-medial and ante-medial fascia is strongly concave; sub-marginal markings unclear.

Odonestis erectilinea erectilinea (Swinhoe, 1904)
Dist: includes NE India
http://www.mothsofborneo.com/part-3/lasiocampidae/lasiocampidae_14_1.php
Not erectilinea which has triangular wings and post-medial fascia outlined with white, and ante-medial/post-medial fascia almost parallel.
MOT vol 4, pl 20/4 & 7.

Not Odonestis bheroba bheroba Nepal, NE India
Not bheroba as post-medial is strongly concave and external margin is not smooth, but slightly dentate,
http://www.jpmoth.org/~dmoth/Digital_Moths_of_Asia/75_LASIOCAMPOIDEA/Lasiocampidae/27_Odonestis/Odonestis%20bheroba/Odonestis%20bheroba.htm
MOT vol 4, pl 20/8 & 9.

Odonestis vita indica Nepal, NE India
http://www.mothsofborneo.com/part-3/lasiocampidae/lasiocampidae_14_3.php
https://www.inaturalist.org/taxa/124949-Odonestis-vita
http://v3.boldsystems.org/index.php/TaxBrowser_Taxonpage?taxid=392697
Not vita, which has irregular or angled post-medial fascia.