The present-day composition and distribution of diaspidid scale and coccinellid beetle species in the Pacific is an amalgam of endemic distribution, and naturalisations or extirpations following unintentional accidental dispersal as well as intentional dispersal as part of biological plant pest control measures. Using primary sources, historic biogeography not only allows us to untangle the nature and sequence of introductions but also to assess which species have endured. This paper is a case study of early twentieth century coccinellid beetles introductions to Micronesia. When faced with the spectre of a collapse of the local copra industry on Yap, the German colonial administration in Micronesia embarked on an ambitious program to eradicate, or at least contain the coconut scale insect. To this end numerous species of coccinellid beetles were introduced from within the Western Pacific (Saipan, New Britain) as well as from the outside (Australia, China, Philippines).

目前，太平洋上的二叠纪鳞甲和球虫甲虫物种的组成和分布是地方性分布的混合物，无意间的偶然扩散和有意扩散后的归化或灭绝是生物植物有害生物防治措施的一部分。使用主要来源，历史生物地理学不仅使我们可以弄清引种的性质和顺序，而且可以评估哪些物种已经忍受。本文是对密克罗尼西亚的二十世纪初球虫科甲虫介绍的个案研究。面对Yap当地椰干产业崩溃的幽灵，德国密克罗尼西亚殖民行政当局开始实施一项雄心勃勃的计划，以消灭或至少遏制椰子鳞虫。