[2] The type species, K. antennatus, is known from only the holotype, a single, complete adult, now deposited in the American Museum of Natural History as specimen number "AMNH Bu-113".

The amber specimen is from deposits in Kachin State, Tanai Village, 105 kilometres (65 mi) northwest of Myitkyina, Myanmar.

Kachinus has a unique combination of characters found in both the Cephennini and Eutheiini tribes of the Scydmaeninae supertribe Scydmaenitae.

[2] Elytra and pronotum which are not clearly discontinuous and a head which does not have a narrowed area from the vertex to the occiput are features found in the modern Cephennini genera.

It is noted that with the distinctly elevated mesosternal keel Kachinus is similar in appearance to the modern genus Paraneseuthia.