Lachnaia is a genus of leaf beetles in the subfamily Cryptocephalinae, tribe Clytrini. Multiple species in this genus are known to be myrmecophiles, such as the larvae of L. italica.

Species Lachnaia caprai Grasso, 1958 Lachnaia cylindrica (Lacordaire, 1848) Lachnaia hirta (Fabricius, 1801) Lachnaia italica Weise, 1881 Lachnaia orientalis Weise, 1881 Lachnaia paradoxa (GA Olivier, 1808) Lachnaia pseudobarathraea K. Daniel & J. Daniel, 1898 Lachnaia pubescens (Dufour, 1820) Lachnaia puncticollis Chevrolat, 1840 Lachnaia sexpunctata (Scopoli, 1763) Lachnaia tristigma (Lacordaire, 1848) Lachnaia variolosa (Linnaeus, 1767) Lachnaia zoiai Regalin, 1997

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