Rhinostomus Rafinesque, 1815
Diagnosis: Small to large, 7-40 mm in total body length; elongate-narrow in form, uniformly black; rostrum more or less straight; mandibles large, divaricate, divergent, with distinct teeth on outer edge; antennal funicle of 6 articles, apex just reaching anterior margin of eye; anterior margin of pronotum straight behind eye; tarsus of 5 articles, but article 4 small, located at very base of article 3, article 3 wider than 2 and bilobed ventrally; front coxae separated; pygydium largely covered by elytra.
Natural history: Adults are collected most frequently at lights but are also associated with trunks of various species of dead or dying palms.
Diversity: Four species of Rhinostomus are known from Central and South America. Two species are found in Costa Rica and Panama.
Distribution: Belize, Costa Rica, Guatemala, Honduras, Nicaragua, Mexico, and Panama; also in South America.
Natural history: This common and widespread species is known as the bottlebrush weevil. It seems to be associated with older, injured or dying palms and is not a primary palm pest. Ferreira and Morin (1984) report on the biology of this species on coconut palms in Brazil.
Eberhard (1983) studied the behaviour of this species, in particular the role of the male “bearded” rostrum and prosternum, and elongated front legs in sexual selection.
Distribution: Costa Rica and Panama; also in South America.
Natural history: No significant information.