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Mealybug (Hemiptera: Pseudococcidae) attacks many citrus plants over the world. This study reveals mealybug species attack on citrus grown at three different altitude levels: lowlands (800 m asl) in Bengkulu Province. The results record nine species of mealybugs namely Dysmicoccus arachidis Williams, Dysmicoccus lepelleyi (Betrem), Ferrisia dasylirii (Cockerell), Ferrisia virgate (Cockerell), Paracoccus tripurae Williams, Pseudococcus comstocki (Kuwana), Pseudococcus cryptus Hempel, Planococcus dischidiae (Takahashi) and Rastrococcus chinensis Ferris. The species of R. chinensis is only found in the lowlands. Furthermore, P. comstocki is only found in the moderate lands and P. discidiae is only found in the highlands. D. arachidis, F. dasylirii, and R. chinensis are new insects pest on citrus. The key of those species is also included.

University sites are generally used as conservation areas in many countries. The secondary forest plays pivotal role in maintaining biodiversity in urban area. One of the creatures that live in secondary forest areas is arthropods. Moreover, there is only limited study about the diversity of soil arthropods in secondary forest of University of Bengkulu (UNIB). This study aimed to calculate the diversity of arthropod species as one of the measurement parameters in biodiversity. The samples were collected from soil and litter taken randomly in the secondary forest area at University of Bengkulu. A total of 5 locations within five replications were placed in the Berlese funnel. The results showed moderate diversity with an index value of 1.18, moderate evenness with an index value of 0.41, and moderate dominance with an index value of 0.56 in the habitat. UNIB secondary forest is being habituated and is still in the category of developing ecosystem. It is estimated that the number of species and populations will increase over time.