Athyma ranga, the blackvein sergeant,[1][2] is a species of nymphalid butterfly found in south-west India, Cambodia and parts of Southeast Asia.

[1][2] Upperside: Male velvety black, female very dark brown, suffused with bluish in certain lights.

It selected one of the side nerves of a leaf and ate away the soft parts on each side till the bare nerve stood out; then having barricaded the approach to this with fragments of leaf which it had contrived to cut off in feeding, mixed with excrement and silk, it rested motionless on the very point of the rib unapproachable by ants or spiders.

We infer that the worst enemies of this species- are not birds or parasites but small spiders and predaceous insects."

It is suspended perpendicularly; abdominal segments slender, the thoracic region larger and expanded laterally; two long sharp horns issuing from the sides of the head and at first parallel, diverge and point laterally; on the back there are two prominent processes curved towards each other, and many small points and tubercles.