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Two major lineages of beetles inhabit cycad cones in the New World: weevils (Curculionoidea) in the subtribe Allocorynina, including the genera Notorhopalotria Tang and O’Brien, Parallocorynus Voss, Protocorynus O’Brien and Tang and Rhopalotria Chevrolat, and beetles in the family Erotylidae, including the genus Pharaxonotha Reitter. Analysis of the 16S ribosomal RNA (rRNA) mitochondrial gene as well as cladistic analysis of morphological characters of the weevils indicate four major radiations, with a probable origin on the cycad genus Dioon Lindl. and comparatively recent host shifts onto Zamia L. Analysis of the 16S rRNA gene for erotylid beetles indicates that an undescribed genus restricted to New World Ceratozamia Brongn. is the most early-diverging clade, and this lineage is sister to a large radiation of the genus Pharaxonotha onto Zamia, with apparent host shifts onto Dioon and Ceratozamia. Analysis of beetles are in accord with current models of continental drift in the Caribbean basin, support some proposed species groupings of cycads, but not others, and suggest that pollinator type may impact population genetic structure in their host cycads.

A new tribe, Mekorhamphini trib. n., two new genera Mekorhamphus gen. n. and Habropezus gen. n. and two new species (M. gyralommus sp. n. and H. plaisiommus sp. n.) are described from Burmese amber. The new tribe resembles the tribe Mesophyletini but differs from the latter by possessing contiguous procoxal cavities and very wide elytra with regular striae. From the tribe Anchineini, it differs by the contiguous procoxal cavities, precoxal portion of the prosternum elongated, and swollen trochanters. The new taxa can be distinguished from modern Carini by having antennae attached near the middle of the rostrum, an elongated precoxal portion of the prosternum and enlarged trochanters.

This contribution provides new information on the association of weevils of the genus Oxycorynus Chevrolat (Belidae: Oxycoryninae) with parasitic plants of the genus Lophophytum Schott & Endl. (Balanophoraceae). New distribution records of Oxycorynus in Argentina are provided.

Se reporta la asociación de Hydnorobius hydnorae (Pascoe) (Belidae: Oxycoryninae) con ambas especies del género Prosopanche de Bary (Hydnoraceae): Prosopanche americana (R. Br.) Baillon y Prosopanche bonacinai Spegazzini, y se cita por primera vez su ocurrencia sobre estaúltima. Se brinda un nuevo registro de distribución en el sur de Mendoza, para la planta P. bonacinai y para las dos especies de gorgojos asociadas con ella: Hydnorobius hydnorae e Hydnorobius parvulus (Bruch). Tal co-ocurrencia de dos especies de Hydnorobius Kuschel, sobre la misma planta hospedadora, también es información nueva.