Phengaris atroguttata, the great spotted blue, is a small butterfly found in India, Myanmar, and China that belongs to the lycaenids or blues family.
The butterfly was earlier known as Polyommatus atroguttata (Oberthür).
It is found in Nagaland and the Chin Hills of Myanmar and is considered rare.
The butterfly ranges from 44 to 48 mm. The butterfly is white with pale blue suffusion, and, also a dark border on the forewing. The male butterfly has very large black discal spots showing through from below. These are darkened in above in the case of the female butterfly.