ABSTRACT White (1846) described Rhisotrogus zealandicus from two syntypes, however no lectotype has since been designated. When the genus Costelytra Given 1952 was described, with Rhisotrogus zealandicus White 1846 as its type species, Given’s description of this species was based on 400 specimens collected at different localities in New Zealand as White’s syntypes were not available to him. Later, Given (1960) examined one of the syntypes, stating that it was identical to specimens he used to describe C. zealandica, but a lectoype was not designated at this time. So, the aims of this paper are: (i) to provide a detailed description of the external morphology, mouthparts and male genitalia based on the syntypes of R. zealandicus; (ii) to compare these type specimens with the description by Given (1952); (iii) to compare the syntypes to establish if they are conspecific; (iv) to designate an appropriate lectotype and (v) to study a representative series of C. zealandica collected from throughout New Zealand to establish the status of the taxon currently known as C. zealandica. Differences between the syntype specimens, and Given’s (1952) description of the New Zealand specimens were found. In addition, White’s syntypes are not conspecific. As a result Costelytra giveni n. sp. is established and described to represent the species currently known as the ‘New Zealand grass grub’. http://zoobank.org/urn:lsid:zoobank.org:pub:F6CB0129-5ACE-4DE1-B76C-95CEE3AFDEEC

中文翻译：

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Costelytra zealandica（White 1846）（鞘翅目：金龟科：Melolonthae）的身份确定，该物种通常被称为新西兰草蛴螬

摘要 White (1846) 描述了来自两种同型的 Rhisotrogus zealandicus，但此后没有指定选型。当描述 Costelytra Given 1952 属时，以 Rhisotrogus zealandicus White 1846 作为其模式种，Given 对该种的描述是基于在新西兰不同地点收集的 400 个标本，因为他无法获得 White 的同型。后来，Given (1960) 检查了其中一个同型，指出它与他用来描述 C. zealandica 的标本相同，但此时没有指定一种 lectoype。因此，本文的目的是：(i) 基于 R. zealandicus 的同型提供对外部形态、口器和雄性生殖器的详细描述；(ii) 将这些类型标本与 Given (1952) 的描述进行比较；(iii) 比较同型以确定它们是否是同种的；(iv) 指定适当的选型和 (v) 研究从新西兰各地收集的具有代表性的 C. zealandica 系列，以确定目前称为 C. zealandica 的分类群的地位。发现了同型标本和 Given's (1952) 对新西兰标本的描述之间的差异。此外，怀特的同型不是同种的。因此，Costelytra 给定了 n。sp. 被建立并描述为代表目前被称为“新西兰草蛴螬”的物种。http://zoobank.org/urn:lsid:zoobank.org:pub:F6CB0129-5ACE-4DE1-B76C-95CEE3AFDEEC zealandica 从新西兰各地收集，以确定目前称为 C. zealandica 的分类群的地位。发现了同型标本和 Given's (1952) 对新西兰标本的描述之间的差异。此外，怀特的同型不是同种的。因此，Costelytra 给定了 n。sp. 被建立并描述为代表目前被称为“新西兰草蛴螬”的物种。http://zoobank.org/urn:lsid:zoobank.org:pub:F6CB0129-5ACE-4DE1-B76C-95CEE3AFDEEC zealandica 从新西兰各地收集，以确定目前称为 C. zealandica 的分类群的地位。发现了同型标本和 Given's (1952) 对新西兰标本的描述之间的差异。此外，怀特的同型不是同种的。因此，Costelytra 给定了 n。sp. 被建立并描述为代表目前被称为“新西兰草蛴螬”的物种。http://zoobank.org/urn:lsid:zoobank.org:pub:F6CB0129-5ACE-4DE1-B76C-95CEE3AFDEEC