Two new species of Bembidion are described from river shores in North America. One, Bembidion mimbressp. nov., from the Gila River watershed in the lands of the Mimbres culture in New Mexico and Arizona, is closely related to the widespread Bembidion levigatum. DNA sequences from several linkage groups and morphology provide evidence of the distinctiveness of B. mimbres. The second, Bembidion corgenomasp. nov., has been the subject of recent genomic and transcriptomic studies. It belongs in the Bembidion transversale subgroup, and occurs from California north to British Columbia, east to Montana and Nevada. The B. transversale subgroup as a whole is reviewed, and morphological characters that distinguish B. corgenoma from the similar and sympatric B. transversale and B. erosum are described and illustrated. DNA sequences of these three species show no consistent differences in 28S, COI, CAD, and Topoisomerase, and a coalescent species delimitation analysis reveals no notable structure within the complex. This is the first known trio of species within Bembidion for which those genes provide no clear signal of species boundaries. A neotype is designated for the one name in the group that lacks a primary type, Bembidium haplogonum Chaudoir. Chromosomes of the new species and their relatives are as is typical for Bembidion, with eleven pairs of autosomes and an XY/XX sex chromosome system.

中文翻译：

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碎片，层序和海岸线：来自北美的两种新的本比当（Coleoptera，Carabidae）

在北美洲的河岸地区描述了两种新的本比比尼物种。第一，Bembidion mimbressp。nov。，来自新墨西哥州和亚利桑那州Mimbres文化地区的吉拉河（Gila River）分水岭，与广泛的本比维尼山（Bembidion levigatum）密切相关。来自几个连锁群和形态的DNA序列提供了微小芽孢杆菌的独特性的证据。第二，本比比定Corgenomasp。11月，已成为最近的基因组和转录组学研究的主题。它属于Bembidion跨国子组，从加利福尼亚州北部到不列颠哥伦比亚省，东部到蒙大拿州和内华达州。整个B. transversale亚组进行了综述，并描述和说明了将B. corgenoma与相似和同生的B. transversale和B. erosum区分的形态特征。这三个物种的DNA序列在28S，COI，CAD和拓扑异构酶上均未显示出一致的差异，并且聚结物种定界分析表明复合物中没有明显的结构。这是Bembidion中第一个已知的物种三重奏，这些基因没有提供明确的物种边界信号。一种新类型被指定为缺少主要类型的组中的一个名称，即Bembidium haplogonum Chaudoir。新物种及其亲属的染色体与Bembidion一样，具有11对常染色体和XY / XX性染色体系统。这是Bembidion中第一个已知的物种三重奏，这些基因没有提供明确的物种边界信号。一种新类型被指定为缺少主要类型的组中的一个名称，即Bembidium haplogonum Chaudoir。新物种及其亲属的染色体与Bembidion一样，具有11对常染色体和XY / XX性染色体系统。这是Bembidion中第一个已知的物种三重奏，这些基因没有提供明确的物种边界信号。一种新类型被指定为缺少主要类型的组中的一个名称，即Bembidium haplogonum Chaudoir。新物种及其亲属的染色体与Bembidion一样，具有11对常染色体和XY / XX性染色体系统。