北京水梭，节肢动物门-昆虫纲-鞘翅目-沼梭甲科。Length 3.6-3.9 mm, width 2.1-2.2 mm. Body wi-dest just behind shoulders, in the middle subparallel.Head: Yellow to yellow-brown, dark mark on neckreaching downwards to halfway height of eyes. Strongly and densely punctured, slightly im-pressed behind fro