Pollock Darren A
Department of Biology, Eastern New Mexico University, Portales, NM 88130 USA..
Zootaxa. 2018 May 17;4420(3):301-333. doi: 10.11646/zootaxa.4420.3.1.
The North American (north of Mexico) species of Elacatis were revised, based on external and genitalic structures of adults. Seven species are recognized, though the historical inclusion of E. fasciatus Bland among Nearctic species is very likely based on an erroneous collecting locality. Two new species are described, with type localities (counties only) in parentheses: E. larsoni (Nebraska: Box Butte County) and E. stephani (Arizona: Cochise County). The following new synonym is proposed: Othnius umbrosus LeConte 1861 = Othnius lugubris Horn 1868; therefore, only E. umbrosus (LeConte) is associated with dead/dying conifers in western North America. Larval E. umbrosus are thought to be xylophagous, while adults are very likely predaceous. Elacatis senecionis (Champion) and E. immaculatus (Champion) are recorded from north of Mexico for the first time. A lectotype is designated for Elacatis longicornis Horn. A key to the seven species in Canada and the United States is provided, supplemented with photographic images of habiti and selected structural features. Maps of known distributions, based on geo-referenced locality lists, are provided.
基于成虫的外部和生殖器结构，对北美（墨西哥以北）的伊拉卡蒂斯属物种进行了修订。确认了7个物种，不过近北区物种中历史上曾包含的布兰德氏带纹伊拉卡蒂斯很可能是基于错误的采集地点。描述了两个新物种，括号内为模式产地（仅县名）：拉尔森氏伊拉卡蒂斯（内布拉斯加州：博克斯巴特县）和斯蒂芬氏伊拉卡蒂斯（亚利桑那州：科奇斯县）。提出了以下新异名：1861年的暗色奥氏步甲 = 1868年的暗色奥氏步甲；因此，只有北美西部的暗色伊拉卡蒂斯与死亡/濒死的针叶树有关。暗色伊拉卡蒂斯的幼虫被认为是食木的，而成虫很可能是捕食性的。墨西哥以北首次记录到了千里光伊拉卡蒂斯和无斑伊拉卡蒂斯。为长角伊拉卡蒂斯指定了一个选模标本。提供了加拿大和美国7个物种的检索表，并辅以栖息地和选定结构特征的照片图像。基于地理定位的地点列表提供了已知分布地图。
