University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Center for Systematic Entomology, Gainesville, Insecta Mundi Florida 2-26-2021 A brief review of the New World Xestipyge Marseul (Coleoptera: Histeridae: Dendrophilinae: Paromalini) with description of a new species from the southwestern USA William B. Warner Follow this and additional works at: https://digitalcommons.unl.edu/insectamundi Part of the Ecology and Evolutionary Biology Commons, and the Entomology Commons This Article is brought to you for free and open access by the Center for Systematic Entomology, Gainesville, Florida at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Insecta Mundi by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. A journal of world insect systematics INSECTA MUNDI 0854 A brief review of the New World Xestipyge Marseul Page Count: 12 (Coleoptera: Histeridae: Dendrophilinae: Paromalini) with description of a new species from the southwestern USA Warner William B. Warner 1345 W. Gila Lane Chandler, Arizona 85224 USA Date of issue: February 26, 2021 Center for Systematic Entomology, Inc., Gainesville, FL Warner WB. 2021. A brief review of the New World Xestipyge Marseul (Coleoptera: Histeridae: Dendrophilinae: Paromalini) with description of a new species from the southwestern USA. Insecta Mundi 0854: 1–12. Published on February 26, 2021 by Center for Systematic Entomology, Inc. P.O. Box 141874 Gainesville, FL 32614-1874 USA http://centerforsystematicentomology.org/ Insecta Mundi is a journal primarily devoted to insect systematics, but articles can be published on any non- marine arthropod. 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This is an open access article distributed under the terms of the Creative Commons, Attribution Non-Commer- cial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited. http://creativecommons.org/licenses/by-nc/3.0/ 0854: 1–12 INSECTA MUNDI 2021 A brief review of the New World Xestipyge Marseul (Coleoptera: Histeridae: Dendrophilinae: Paromalini) with description of a new species from the southwestern USA William B. Warner 1345 W. Gila Lane Chandler, Arizona 85224 USA [email protected] Abstract. New World species of the histerid beetle genus Xestipyge Marseul (Coleoptera: Histeridae: Den- drophilinae: Paromalini) are reviewed, and X. skelleyi, new species, is described. A dichotomous key and illustrations are provided as identification means for the now five included species from the Western Hemi- sphere. Key words. Key, taxonomy, clown beetle, inquiline. ZooBank registration. urn:lsid:zoobank.org:pub:966EA115-4F25-4B34-996F-FB0DF51E609D Introduction Xestipyge was erected by Marseul (1862) as a monotypic subgenus of his genus Carcinops for “Carcinops radula Marseul” because of its unusual elytral striae, with fourth dorsal stria arched over the fifth dorsal stria and con- necting to the sutural (= sixth dorsal) stria. Lewis elevated Xestipyge to generic status in 1905. In addition to the different elytral strial arrangement, mostXestipyge species (including all those known from the New World) have unusual ground punctures consisting of mostly transverse groups of 2–5 (usually 3) micropunctures (e.g., Fig. 4), and males have the ventral protarsal setae enlarged and spatulate somewhat similar to males of many Saprininae histerids. The unusual microsculpture ofXestipyge adults is shared by specimens of Carcinops subgenus Carci- nopsida Casey, currently comprising four described species of which two were considered valid by Reese and Swanson (2017); however, C. (Carcinopsida) species lack the elytral strial and male protarsal characters of Xesti- pyge species. Microsculpture in the several dozen species forming the much larger nominate subgenus Carcinops consists of discrete, single micropunctures. Xestipyge species are not numerous, and Mazur (2011) lists only four species from the New World. Com- pared to many other Paromalini groups, Xestipyge species are relatively distinctive from one another, differing both in external sculpture and in the shape of the male genitalia, especially the parameres in males. This brief review provides a description of a new species from the southwestern USA, along with illustrations of it and the other four described species from the Western Hemisphere. Materials and Methods Terminology except as described below follows Bousquet and Laplante (2006). As is the standard for histerids, elytral striae are numbered in ascending order from the humerus to the suture, rather than from the suture towards the outside as is used in most other beetles. Measurements are rounded to the nearest 0.1 mm. “Length” is defined by the dorsal distance between the anterior edge of the pronotum to the posterior edge of the elytra. “Total length” is defined as the distance between the visibly anterior-most point of the body (usually head) to the visible posterior-most point on the body (usually pygidium), both measurements being exclusive of appendages. (Where fewer than 10 specimens were measured, the number is given following the size range.) “Ground punc- tures” means the underlying micropunctural surface sculpture, not the much larger punctures visible to the naked eye or under low magnification. Ground punctures in Xestipyge are grouped micropunctures (usually groups of 3) and are generally not mentioned in diagnoses as they are present on most body surfaces on all species. The 2 · February 26, 2021 Warner groupings are generally more or less transverse, but on the more heavily punctured lateral pronotal portions can become nearly longitudinal and tend to form channels between the micropunctures, and may appear subacicu- late. Elytral “pseudostriae” are elongate striaform elements between the dorsal stria, generally of much shorter length than striae themselves and often discontinuous. Those species lacking elytral pseudostriae often have similar, though finer, aciculations on the apical elytral declivity, each scratch-like mark ending in a puncture at the top of the declivity and not extending far onto the elytral disc as with pseudostriae. Males may be separated from females by the structure of the protarsal setae (Bousquet and LaPlante 2006): Males have the ventral setae flattened and broader (narrowly subfoliate), whereas females have these setae simple and usually shorter. Synony- mies do not include mere mention in checklists or other publications without taxonomic acts, (re)descriptions, or keys. In distribution information, USA state and Canadian provincial codes are those used by the postal services of those countries. Collection codes are as follows: ASUT: Arizona State University, Tempe; CASC: California Academy of Sciences, San Francisco; CMNH: Carnegie Museum of Natural History, Pittsburgh; CSCA: California State Collection of Arthropods (California Department of Food & Agriculture), Sacramento; CSUC: Colorado State University, Ft. Collins; DMNS: Denver Museum of Nature and Science, Denver; FMNH: Field Museum of Natural History, Chicago; FSCA: Florida State Collection of Arthropods, Gainesville; MCZC: Museum of Com- parative Zoology, Harvard University, Cambridge; MNHN: Museum Nacional Histoire Naturelle, Paris; TAMU: Texas A & M University, College