Pandeleteius florivorus sp.nov. is described from specimens feeding on the flowers of Piptadenia leucoxylon Barneby et Grimes (Mimosaceae) in Venezuela. Additional distribution records and a revised key to the species of the Pandeleteius biseriatus (Kirsch) species-group are given.

Adults and larvae of Rhinosimus viridiaeneus Randall observed on Vancouver Island, British Columbia, prefer the inner bark of dead branches of red alder (Alnus rubra Bong.) for food. When feeding, the flattened elongated rostrum of the adult is inserted between the papery outer bark and the cambium. The rostrum is also used to prod or flip intruding Rhinosimus away from a feeding site. The larva is described for the first time.

Seven species-groups comprising 20 species in the New World genus Pandeleteius are described or redescribed; they are recognized by their irregular elytral striae and their well-developed stylus on the coxite of the female genitalia. The species-groups and their composition are as follows: P. biseriatus species-group—P. biseriatus (Kirsch), P. confinis sp.nov., P. subtilis sp.nov., P. thomasi sp.nov.; P. pollinosus species-group—P. pollinosus sp.nov., P. mesosternalis sp.nov.; P. porosus species-group—P. porosus (Boheman) (P. aspericollis Hustache, new synonymy), P. spinipennis sp.nov., P. scorpioides sp.nov., P. semiconnatus sp.nov., P. connatus sp.nov., P. torosus sp.nov.; P. upsilon species-group—P. upsilon Howden, P. penai sp.nov., P. baccatus sp.nov., P. cornelli sp.nov., P. smithsoni sp.nov.; P. assimilis Voss (monobasic species-group); P. colatus sp.nov. (monobasic species-group); and P. latirostris (Hustache) (monobasic species-group).

Lectotypes are designated for Menetypus aspericollis Hustache and Pandeleteius assimilis Voss.

All species are South American except P. thomasi, which is Mesoamerican.

Host plants are unknown but adults of five species are recorded as feeding on leaves of various Caesalpinaceae and Mimosaceae.

Fauna of the genus Pandeleteius Schoenherr of Colombia, Venezuela, Trinidad, and the Lesser Antilles are revised in part. Six new species of Pandeleteius are described: P. trinidadensissp. nov. (P. angustirostris species group); P. sabanaensissp. nov. and P. bolivarisp. nov. (P. campestris species group, new concept); P. guriensissp. nov. and P. ductilissp. nov. (P. candidus species group, new concept); and P. clarkisp. nov. (P. modestus species group). The P. kirschi species group (new concept) is redefined based on male and female genitalia, and P. testaceipes Hustache is added to the species group. The other sex is described for three species formerly known from only one sex: the male of P. candidus Howden, male of P. arcanus Howden, and female of P. liberalis Howden. New findings on the post-pupal growth and morphology of the male and female genitalia are applied to the group- and species-level taxonomy. The key to the Pandeleteius species of Venezuela and Colombia is revised to include all the original species groups and subsequent changes, as well as all new taxa.

The majority of the species of the New World litter-inhabiting eyeless weevils belong to groups possessing uncinate tibiae: Molytinae, Cryptorhynchinae, and Cossoninae. The remaining species are Raymondionymini (Erirhininae) and are not included in this work.Eight genera and 40 species with uncinate tibiae are diagnosed and keyed. Caecossonus Gilbert (four species) is revised and the following new species are described: C. continuus (Mexico); C. sylvaticus (Belize). Decuanellus Osella (10 species) is revised and the following new species are described: D. bahamensis (Bahama Islands); D. brevicrus (Virgin Islands); D. iviei (Virgin Islands); D. longirostris (Puerto Rico); D. muchmorei (Virgin Islands). The new genus Kuschelaxius is proposed and the type species K. tomentosus (Puerto Rico) is described from Puerto Rico. The new species K. discifer is described from Hispaniola. No new species are described in the remaining genera: Howdeniola Osella (two species, Colombia); Lymantes Schoenherr (five species, central United States, El Salvador); Neotorneuma Hustache (one species, Chile); Pseudoalaocybites Osella (15 species, Cuba, Jamaica, Colombia, and Venezuela); Pseudocaecocossonus Osella (one species, Cuba). There are many undescribed species in Lymantes and Pseudoalaocybites, and problems precluding much-needed revisions of these genera are detailed.New combinations and a new synonymy are as follows: Bordoniola Osella is transferred to Raymondionymini; Howdeniola is transferred to Cossoninae; Caecossonus negreai Osella is transferred to Pseudoalaocybites (Pseudoalaocybites); Pseudoalaocybites (Pseudoalaocybites) venezuelanus Osella is transferred to P. (Croizatius); Pseudoalaocybites (Croizatius) montanus Osella is a junior synonym of P. (C.) latithorax Osella.Both the geological history of the Caribbean and dispersal by overwater rafting influenced the present distribution patterns of Caecossonus and Decuanellus.