The Southeast Asian whirligig beetle genus Porrorhynchus Laporte, 1835 is revised. The genus is composed of five species, P. depressus Régimbart, 1892, P. indicans (Walker, 1858), P. landaisi Régimbart, 1892, P. marginatus Laporte, 1835, and P. misoolensis (Ochs, 1955), new status, and two subgenera, Porrorhynchus s. str. and Rhomborhynchus Ochs, 1926. The characters uniting the species within the two subgenera are discussed, as is their relation to the genus Dineutus Macleay, 1825. New synonyms are established: Ceylorhynchus Brinck, 1955 is synonymized with the Porrorhynchus s. str.; P. barthelemyi Régimbart, 1907 and P. landaisi latilimbus Ochs, 1926 are synonymized with P. landaisi; P. marginatus mjobergi Ochs, 1926 is synonymized with P. marginatus; Dineutus (Rhomborhynchus) depressus jamurensis Ochs, 1955, Dineutus (Rhomborhynchus) depressus versteegi Ochs, 1955, and Dineutus (Rhomborhynchus) depressus moszkowskii Ochs, 1955, are synonymized with P. (Rhomborhynchus) depressus. Porrorhynchus misoolensis (Ochs, 1955) is elevated to full species status. Lectotypes are designated for P. brevirostris Régimbart, 1877, P. tenuirostris Régimbart, 1877, P. landaisi Régimbart, 1892, P. barthelemyi Régimbart, 1907, P. marginatus mjobergi Ochs, 1926, and P. landaisi latilimbus Ochs, 1926. Each species has its dorsal habitus imaged, male and female genitalia illustrated, important morphology illustrated, complete catalog of associated names and their use, distribution mapped, and proposed common name proposed, along with a discussion section. A key to the species is included, as is a checklist of the species that includes synonyms and common names.

Five new genera and 13 new species of Neotropical synchitine zopherids are described, and two new combinations are proposed. Globotrichus Lord and Ivie, new genus (type species Globotrichus harti Lord and Ivie, new species) is described from Central and South America. Helonoton Lord and Ivie, new genus (type species Helonoton costaricense Lord and Ivie, new species) is described from Central America for Helonoton pascoei (Sharp, 1894), new combination (from Bitoma Herbst) and 11 new species: Helonoton amistad Lord and Ivie, new species; Helonoton ashei Lord and Ivie, new species; Helonoton bituberculatum Lord and Ivie, new species; Helonoton chiriqui Lord and Ivie, new species; H. costaricense; Helonoton foleyi Lord and Ivie, new species; Helonoton mexicanum Lord and Ivie, new species; Helonoton pustulosum Lord and Ivie, new species; Helonoton tatumbla Lord and Ivie, new species; Helonoton tico Lord and Ivie, new species; and Helonoton tripartum Lord and Ivie, new species. Paxillobitoma Lord and Ivie, new genus (type species Paxillobitoma clinei Lord and Ivie, new species) is described from South America. Rapthius Lord and Ivie, new genus (type species Tarphius peruvianus Franz, 1969, new combination) is described from Peru. Slipinskius Lord and Ivie, new genus (type species Tarphius chilensis Franz, 1969, new combination) is described from Chile. Distribution maps, illustrations, redescriptions, and keys are provided.

A brief review of the classification history of the subfamily Colydiinae is provided, followed by a provisional diagnosis for the group. The 47 genera of New World Colydiinae (Colydiidae auctorum) are reviewed, with an illustrated key to genera, a representative habitus of each genus, a list of all 305 described species currently considered valid, each placed into the appropriate recognized genus, with full citations for each. Numerous nomenclatural changes are noted. Opostirus Kirsch is transferred to the Tenebrionidae: Eudysantina, new placement. The Adimerini Sharp 1894 are synonymized with Synchitini Erichson, 1845, new synonymy. In the Acropini, Lemmis Pascoe, 1860 = Acropis Burmeister, 1840, new synonymy, with Acropis caelatus (Pascoe, 1860), new combination and Acropis tuberosus (Grouvelle, 1896), new combination. Acropis fryi Pascoe, 1860 = Acropis tuberculifera Burmeister, 1840, new synonymy and Acropis incensa Pascoe, 1860 = Acropis aspera Pascoe, 1860, new synonymy. In the Synchitini, Anisopaulax Reitter, 1877 = Lasconotus Erichson, 1845, new synonymy, with Lasconotus brucki (Reitter, 1877), new combination. Pristoderus brasiliensis (Grouvelle, 1896), new combination follows synonymization of Ulonotus Erichson with Pristoderus. Eucicones Sharp, 1894 = Catolaemus Sharp, 1894 = Cacotarphius Sharp, 1894, new synonymies, with Eucicones minutus (Sharp, 1894), new combination and Eucicones compressus (Sharp, 1894), new combination. Reylus Ivie, Lord, Foley, and Ślipiński is a new replacement name for Erylus Dajoz, 1969 [not Erylus Gray, 1867 (Porifera)]. Eulachus Erichson, 1845 = Anarmostes Pascoe, 1860, new synonymy, with Anarmostes costatus (Erichson, 1845), new combination, Bitoma quinquecarinata (Chevrolat, 1864), new combination, and Bitoma semifuliginosa Chevrolat, 1864), new combination. Hystricones Sharp, 1894 = Paryphus Erichson, 1845, new synonymy, with Paryphus armatus (Sharp, 1894), new combination and the following species moved to Colobicones Grouvelle, 1918: Colobicones vagans (Arrow, 1927), new combination; Colobicones hirtus (Ślipiński, 1985), new combination; and Colobicones papuanus (Ślipiński, 1985), new combination. Labrotrichus Sharp, 1894 = Neotrichus Sharp, 1885, new synonymy, with Neotrichus aberrans (Sharp), new combination and Neotrichus verrucatus (Hinton, 1935), new combination. Microsicus Sharp, 1894 = Synchita Hellwig in Schneider, 1792, new synonymy, resulting in changes for the Japanese

Anthrenus (Florilinus) taiwanicus Kadej, Háva, and Kitano, new species, Anthrenus (Florilinus) ohbayashii Kadej, Háva, and Kitano, new species, both from Taiwan, and Anthrenus (Solskinus) katmandui Kadej, Háva, and Kitano, new species, from Nepal, are described, illustrated, and compared with related species. Keys to the known species of Anthrenus Geoffroy from Nepal and Taiwan are presented.

Physopleurus antonkozlovi Santos-Silva and Botero, new species from Colombia, is described and illustrated. A key to females of Physopleurus Lacordaire with spines on the protibiae is provided.

Haliplus lucigelinae Vondel and Alarie, new species, is described from Ontario and Québec, Canada. A description, diagnosis, distribution, and illustrations of the new species are provided.

A short history of Amillarus Thomson, 1857 (Cerambycidae: Lamiinae: Agapanthiini) is provided. Aphies Dejean, 1835 is considered as an unavailable genus name. A lectotype is designated for Amillarus erythroderus Chevrolat, 1861. A short comment on Amillarus secundus (Tippmann, 1951) is provided. Trichogrammopsis ruficollis Breuning, 1948 is considered as a new junior synonym of Amillarus singularis Aurivillius, 1922. Amillarus apicalis nigroampliatus Breuning, 1974 is provisionally kept as distinct from A. apicalis apicalis Thomson, 1857.

Cyclocaccus Sharp is a Neotropical genus comprising three previously described species from Central America. We recognize three species-groups within the genus, redescribe previously described species, and describe 12 new species, bringing the total to 15 species as follow: the Cyclocaccus laeticulus species-group includes C. clinei Hisamatsu, new species, C. laeticulus Sharp, 1891, C. speciosus Hisamatsu, new species, C. monticola Sharp, 1891, C. costaricensis Hisamatsu, new species, C. maculatus Hisamatsu, new species, and C. epakros Hisamatsu, new species; the Cyclocaccus brevicollis species-group includes C. brevicollis Sharp, 1891, C. oenorubens Hisamatsu, new species, and C. pantherinus Hisamatsu, new species; and the Cyclocaccus morulus species-group includes C. lescheni Hisamatsu, new species, C. stonyx Hisamatsu, new species, C. morulus Hisamatsu, new species, C. smileyeyes Hisamatsu, new species, and C. intermediatus Hisamatsu, new species. All species are described or redescribed. Dorsal habitus images, illustrations of male and female genitalia, and other important diagnostic characters are provided for all species. A key for identification of species-groups and species is included.

Two new species of the scydmaenine genus Syndicus Motschulsky, 1851, Syndicus (s. str.) qiong Yin and Zhou, new species and Syndicus (s. str.) philippinus Yin and Zhou, new species, are described from southern China and the Philippines, respectively. Syndicus (Semisyndicus) schuelkei Jałoszyński, 2011, new synonym is placed as a junior synonym of Syndicus (Semisyndicus) sinensis Jałoszyński, 2004. Material from Sichuan, previously published as S. sinensis, represents a different species, described here as Syndicus (Semisyndicus) sichuanicus Yin and Zhou, new species. Additional collecting data are given for Syndicus (s. str.) jaloszynskii Yin and Song, 2014 and Syndicus (Semisyndicus) hainanicus Yin and Li, 2015 in China, and Syndicus (s. str.) difficilis Jałoszyński, 2004 in Thailand.

Two newly described species of the West Indian genus Xerolinus Ivie and Hart provide new island records for the genus and extend the previously known range of the genus to the south and east. Xerolinus swearingenae Hart and Ivie, new species, is described from Jamaica, whereas Xerolinus camanoensis Hart and Ivie, new species, is described from the Virgin Islands (Great Camanoe).

Altica sylvia Malloch, 1919 and Mantura chrysanthemi (Koch, 1803) co-inhabit natural and commercial stands of lowbush blueberry, Vaccinium angustifolium Aiton (Ericaceae), in eastern Canada and the northeastern United States. Whereas A. sylvia feeds on lowbush blueberry plants, an important crop to the region, M. chrysanthemi feeds on sheep sorrel, Rumex acetosella L. (Polygonaceae), an important weed frequently found in lowbush blueberry fields. This study provides a detailed morphological examination of males and females of these flea beetles to compare species and sex-specific features. Scanning electron microscopy identified key distinguishing features, including internal and external sexual dimorphism of both species.