Queensland Museum, PO Box 3300, South Brisbane 4101, Queensland, Australia..
Zootaxa. 2021 Apr 28;4965(2):363374. doi: 10.11646/zootaxa.4965.2.9.
The endemic Australian ruteline genus Mesystoechus Waterhouse, 1878 (Coleoptera: Scarabaeidae: Rutelinae: Anoplognathini: Schizognathina) is revised and compared with Amblochilus Blanchard, 1851 and Bilobatus Machatschke, 1970. Mesystoechus lithgowae new species is described from inland southeastern Queensland. Diagnostic characters and information on the distribution, natural history, and ecology of the two previously described species (M. ciliatus Waterhouse, 1878 and M. costatus Carne, 1958) and a description of the female of M. costatus are given. A key to males of the genus is proposed. Lectotypes are designated for Amblochilus bicolor Blanchard, 1851, Mesystoechus ciliatus Waterhouse, 1878, Homotropus luridipennis Waterhouse, 1878 (now Bilobatus luridipennis), and Homotropus testaceipennis Ohaus, 1901 (now Bilobatus testaceipennis), and their distributions are clarified.
澳大利亚地方性 Ruteline 属 Mesystoechus Waterhouse，1878（鞘翅目：金龟科： Rutelinae：Anoplognathini：Schizognathina）经过修订，并与 Amblochilus Blanchard，1851 和 Bilobatus Machatschke，1970 进行了比较。来自昆士兰内陆东南部的新种 Mesystoechus lithgowae 被描述。对以前描述的两个物种（M. ciliatus Waterhouse，1878 和 M. costatus Carne，1958）以及 M. costatus 雌性的分布、自然历史和生态给出了诊断特征和信息。提出了属雄性的关键。指定了 Amblochilus bicolor Blanchard，1851、Mesystoechus ciliatus Waterhouse，1878、Homotropus luridipennis Waterhouse，1878（现为 Bilobatus luridipennis）和 Homotropus testaceipennis Ohaus，1901（现为 Bilobatus testaceipennis）的模式标本，并澄清了它们的分布。
