Similiar species:

Separating C. laesaria, meritaria and subtiliaria vide Moths of Borneo and Han & Xue, Fauna Sinica and personal notes of SS. These species are best separated by dissection of genitalia. 
 

Separating C. laesaria, meritaria and subtiliaria vide Moths of Borneo and Han & Xue, Fauna Sinica. 

laesaria: smallest in size (FWL~6-9 mm), postmedials strongly red, two prominent red spots on dorsum. Wings pale blue; hind tibia of male dilated, with hair-pencil. Throughout India distribution. 

meritaria: intermediate size (FWL ~ 8-10 mm). the postmedials are more irregular in size as in laesaria, but the white component predominates, rather than the red. Wings bluish green; hind tibia of male undilated, without hair-pencil. Possibly peninsular Indian distribution (?).

subtiliaria: largest species (FWL ~ >11 mm), postmedials , large and largely with white elements, distal margin (termen) of forewing is straighter than in other species, hindwing discal spot is more regular, square or rhomboidal rather than shaped like an 'N' or 'M'. Wings pale blue; hind wing with the dot on CuA of the postmedial line closer to discal spot than to outer margin. Himalayan species. 

Comostola Meyrick, 1888 species known from the Indian subcontinent. 

Comostola caerulea Warren, 1893. Sikkim, Arunachal Pradesh.

Comostola cedilla Prout, 1917. Andaman Is. 

Comostola chlorargyra (Walker, 1861). India sub-region.

Comostola dispansa (Walker, 1861). Sri Lanka. 

Comostola dyakaria (Walker, 1861). Khasi Hills, Meghalaya.

Comostola hauensteini Smetacek, 2004. Uttarakhand (TL: Bhimtal), Nagaland, Arunachal Pradesh, West Bengal. 

Comostola hypotyphla Prout, 1917. Dalhousie, Himachal Pradesh. 

Comostola inops Prout, 1912. Kashmir: Lidda Valley, Lidderwat, 6700ft, Arunachal Pradesh.

Comostola laesaria (Walker, 1861). India; Sri Lanka (TL). 
Comostola leucosticta Yazaki, 1993. India: Arunachal Pradesh; Nepal (TL). 

Comostola maculata (Moore, 1868). West Bengal.

Comostola meritaria (Walker, 1861). India; Sri Lanka (TL).

Comostola multimaculata (Pajni & Walia, 1984). Himachal Pradesh, Nauni. 

Comostola mundata Warren, 1896. Khasi Hills, Meghalaya.

Comostola ovifera (Warren, 1893). India: Sikkim; Tibet. 

Comostola pyrrhogona (Walker, 1866). South India.

Comostola quantula (Swinhoe, 1886), Mumbai, Maharashtra. 

Comostola subtiliaria (Bremer, 1864). Himalayas. 

Comostola subtiliaria demeritaria Prout, 1917. Khasi Hills, Meghalaya.

Comostola turgescens (Prout, 1917). Khasi Hills, Meghalaya, Arunachal Pradesh.

Comostola virago Prout, 1926. Khasi Hills, Meghalaya.