[1] Chestnut-brown, shining; mandibles finely and closely, head and thorax more or less widely, longitudinally striate; the nodes of the pedicel smooth or only slightly rugulose; abdomen polished and smooth; pilosity long, abundant, reddish yellow, slightly oblique on the antennae and legs.

Thorax: the pronotum somewhat vaguely and transversely and the mesonotum posteriorly longitudinally striate; anteriorly the latter is smooth and polished, the scutellum rugose, the metanotum irregularly striate rugose, including the basal portion of the metanotal spines.

Light chestnut-yellow, the apical margins of the abdominal segments more or less broadly brownish black; head and thorax somewhat densely pubescent, in places rugulose, giving them a dull subopaque look; head on each side of the ocelli longitudinally striate.

subcarinata, Smith, is slighter, more slender and lighter in colour, often nearly smooth; it occurs in Bengal, Burma, and Tenasserim, and extends down to Borneo.

The colour and the rugosity, as well as the pilosity, vary very much; but, so far as a very long series has enabled me to judge, the one species with many slightly differing local races extends through India, Ceylon, and Burma.