Lachnopus is a genus of broad-nosed weevils in the family Curculionidae distributed in the Caribbean Region.

[2] The names Menoetius Dejean, 1821-94 [3] and Ptilopus Schönherr, 1823: c. 1140 [4] are considered junior synonyms of Lachnopus.

[6] Then considered among the Barynotini in van Emden (1944) [7] and O'Brien and Wibmer (1982),[5] a widespread assemblage of weevils which is now known as the Geonemini.

[10] Girón et al. (2018) recognized six species groups within the genus,[10] partly based on results of a previous morphology-based phylogenetic study.

[11] According to the key provided by van Emden (1944),[7] some characters to recognize the genus Lachnopus are as follows: Rostrum weakly and evenly convex throughout; antennal scape extending to, or slightly passing beyond middle of eye; frons between eyes conspicuously narrower than dorsal surface of rostrum; head not constricted posteriad of eyes; eyes only moderately convex; humeri only slightly wider than posterior margin of pronotum; femora unarmed; tibiae ventrally denticulate; and metatibial corbel lacking scales.The genus Lachnopus ranges across the Caribbean Region, spanning the Lucayan Archipelago (The Bahamas plus the Turks and Caicos Islands), the Greater Antilles, the Cayman Islands, and Cozumel Island (Mexico).