Ambrosia beetles of the Euwallacea fornicatus (Eichhoff, 1868) species complex are emerging tree pests, responsible for significant damage to orchards and ecosystems around the world. The species complex comprises seven described species, all of which are nearly identical. Given that the morphology-defined species boundaries have been ambiguous, historically, there has been much disagreement on species validity, which was compounded by the presumed loss of the type series of E. fornicatus. The species complex was recently reviewed using morphometrics to associate the type specimens to the clades delineated with molecular data under the assumption of the lost type series. We rediscovered a syntype of Xyleborus fornicatus, and reevaluated the species in the complex using morphometrics. We propose the following taxonomic changes to the species complex: Euwallacea fornicatus (=E. tapatapaoensis (Schedl, 1951); = E. whitfordiodendrus (Schedl, 1942)) syn. res.); E. fornicatior (Eggers, 1923) (=E. schultzei (Schedl, 1951) syn. nov.); E. kuroshio (Gomez and Hulcr, 2018) and E. perbrevis (Schedl, 1951) stat. res. These taxonomic changes shift the species name associated with the widely used common names for two taxa, namely: Euwallacea fornicatus should be used for the “Polyphagous Shot Hole Borer”, and E. perbrevis for the “Tea Shot Hole Borer clade a”. A lectotype is designated for X. fornicatus in order to stabilize the use of the name.

The occurrence of the exotic “granulate ambrosia beetle” Xylosandrus crassiusculus (Motschulsky) in Argentina and Uruguay is reported for the first time, documenting expansion in South America. Morphological characters are provided to allow distinction of this species from other similar ambrosia beetles. Molecular identification was also done on the basis of the 5′ region of the mitochondrial cytochrome c oxidase I (COI) gene, obtained from a specimen from Argentina and compared with available “barcode” sequences in public databases. Phylogenetic analyses, via maximum likelihood and parsimony, were performed using COI sequences from 17 terminals, including 14 sequences of X. crassiusculus from different continents plus other Xylosandrus and Cnestus species as outgroups. Results from the sequence analyses confirm the identity of X. crassiusculus. The specimen from Argentina and the two sampled from United States showed no differences in their COI sequences. Further studies are needed, on the genetic variation through the native and introduced ranges of the granulate ambrosia beetle, to ascertain the source/s of origin of this biological invasion in the Americas. The present paper reports the expansion of this exotic species in South America into Argentina and Uruguay.

Xyleborine ambrosia beetles bore galleries into wood to cultivate symbiotic fungi for larval and adult food. This habit and their haplodiploid mating system have contributed to their diversification in forest habitats throughout the world. There are ∼1,200 species divided in 37 genera that have been recently revised in a phylogenetic framework. To continue to equate genera with monophyletic groups, we investigated the validity of Heteroborips Reitter, 1913, a genus first erected for the Palearctic species Xyleborus cryptographus (Ratzeburg, 1837). Based on a phylogeny inferred fromDNAsequence data, X. cryptographus and Xyleborus seriatus (Blandford, 1894) are monophyletic. These species are unrelated to Xyleborus Eichhoff, 1864 and belong to a larger clade of species of Coptodryas Hopkins, 1915, Cryptoxyleborus Schedl, 1937, and Microperus Wood, 1980. Xyleborus cryptographus and X. seriatus differ from these and other Xyleborini genera by excavating brood galleries under bark and by characteristics of the antennae, pronotum, and elytra. Given monophyly and morphological diagnostic characters, Heteroborips is validated as genus bona and includes the type species, Heteroborips cryptographus, combination reinstated, and Heteroborips seriatus, new combination.

The following 13 new combinations are given: Ambrosiophilus osumiensis (Murayama, 1934), Ancipitis machili (Niisima, 1910), Cyclorhipidion bispinum (Nobuchi, 1981), Cyclorhipidion japonicum (Nobuchi, 1981), Cyclorhipidion laetum (Niisima, 1909), Cyclorhipidion misatoense (Nobuchi, 1981), Cyclorhipidion miyazakiense (Murayama, 1936), Cyclorhipidion okinosenense (Murayama, 1961), Cyclorhipidion takinoyense (Murayama, 1953), Debus defensus (Blandford, 1894), Immanus permarginatus (Schedl, 1933), Microperus calamoides (Murayama, 1934), Microperus quercicola (Eggers, 1926), all originally described in Xyleborus Eichhoff, 1864. The following 24 new synonyms are proposed: Ambrosiophilus atratus (Eichhoff, 1876) (=Xyleborus collis Niisima, 1910 syn. n.); Ambrosiophilus osumiensis (Murayama, 1934) (=Xyleborus metanepotulus Eggers, 1939 syn. n.); Ancipitis machili (Niisima, 1910) (=Xyleborus depressus Eggers, 1923 syn. n.; = Xyleborus kojimai Murayama, 1936 syn. n.); Anisandrus dispar (Fabricius, 1792) (=Xyleborus ishidai Niisima, 1909 syn. n.); Cnestus aterrimus (Eggers, 1927) (=Cnestus maculatus Browne, 1983 syn. n.; = Cnestus murayamai Schedl, 1962 syn. n.; = Cnestus murayamai Browne, 1963 syn. n.; = Tosaxyleborus pallidipennis Murayama, 1950. syn. n.); Cyclorhipidion miyazakiense (Murayama, 1936) (=Xyleborus armipennis Schedl, 1953 syn. n.; = Xyleborus wakayamensis Nobuchi, 1981 syn. n.); Microperus kadoyamaensis (Murayama, 1934) (=Xyleborus nameranus Murayama, 1954 syn. n.); Microperus quercicola (Eggers, 1926) (=Xyleborus izuensis Murayama, 1952 syn. n.); Planiculus bicolor (Blandford, 1894) (=Xyleborus ashuensis Murayama, 1954 syn. n.); Xyleborinus attenuatus (Blandford, 1894) (=Xyleborinus canus Niisima, 1909 syn. n.); Xyleborinus schaufussi (Blandford, 1894) (=Xyleborus kraunhiae Niisima, 1910 syn. n.); Xyleborus festivus Eichhoff, 1876 (=Xyleborus detectus Schedl, 1975a syn. n.; = Xyleborus pinicola Eggers, 1930 syn. n.; = Xyleborus pinivorus Browne, 1980 syn. n.); Xyleborus metacuneolus Eggers, 1940 (= Xyleborus kaimochii Nobuchi, 1981 syn. n.); Xyleborus perforans (Wollaston, 1857) (=Xyleborus shionomisakiensis Murayama, 1951 syn. n.); Xyleborus pfeilii (Ratzeburg, 1837) (=Xyleborus septentrionalis Niisima 1909 syn. n.); Xyleborus seriatus Blandford, 1894 (=Xyleborus todo Kono, 1938 syn. n.); Xylosandrus brevis (Eichhoff, 1877) (=Xyleborus montanus Niisima, 1910 syn. n.). Arixyleborus yakushimanus (Murayama, 1958) is removed from synonymy with A. malayensis (Schedl, 1954). The types of Xyleborus nagaoensis Murayama, 1934, and X. ohtoensis Nobuchi, 1981 were examined and are confirmed to be correctly placed in Xyleborus. Lectotypes are designated for Xyleborus ishidai Niisima, 1909, and Xyleborus septentrionalis Niisima, 1909.

Sarah M. Smith, Roger A. Beaver, and Anthony I. Cognato (2017) The Ambrosia Beetle Ambrosiophilus peregrinus Smith and Cognato, Introduced to the USA, is Ambrosiophilus nodulosus (Eggers), New Combination (Coleoptera: Curculionidae: Scolytinae) The Coleopterists Bulletin: Vol. 71, No. 3, pp. 552-553. https://doi.org/10.1649/0010-065X-71.3.552

In 2015, a trapping effort was initiated to collect individuals of the polyphagous shot hole borer, Euwallacea nr. fornicatus (Eichhoff), at five sites in northern Vietnam. The traps tested the usage of quercivorol (paramenthenol), a-copaene, cubeb oil, conophthorin, and ethanol as potential lures. These compounds have been effective in collecting individuals in the USA but have not been tested within the species' putative native range. As reported for the USA, the species responded best to the quercivorol lure. Throughout the duration of the study, 21 species were collected. Among them were Ambrosiophilus nodulosus (Eggers, 1941), Beaverium magnus (Niisima, 1910), new combination, Xyleborus glabratus Eichhoff, 1877, and Xylosandrus discolor (Blandford, 1898), all of which are new country records. Arixyleborus nudulus Smith, Rabaglia, and Cognato, new species, was also collected and is described and illustrated.