The endemic Hawaiian mealybug genus Phyllococcus Ehrhorn, 1916 (Hemiptera: Coccomorpha: Pseudococcidae): redescription of the type species and description of a new species on an endangered host plant, Cryptocarya mannii (Lauraceae) Author Percy, Diana M. Department of Botany and Biodiversity Research Centre, University of British Columbia, Vancouver, V 6 T 1 Z 4, BC, Canada. Author Watson, Gillian W. Department of Life Sciences, the Natural History Museum, Cromwell Road, London SW 7 5 BD, U. K. Author Hodgson, Chris J. Department of Biodiversity and Biological Systematics, The National Museum of Wales, Cardiff, CF 10 3 NP, Wales, U. K. text Zootaxa 2024 2024-05-07 5447 3 355 372 http://dx.doi.org/10.11646/zootaxa.5447.3.2 journal article 10.11646/zootaxa.5447.3.2 1175-5326 11149806 866DAE88-DFF6-4B05-A984-CD2F46EAE2A0 Phyllococcus oahuensis (Ehrhorn) ( Figs 1A & B , 2 , 3 ) Cissococcus? oahuensis Ehrhorn 1912: 149 . Phyllococcus oahuensis ( Ehrhorn, 1912 ) ; Ehrhorn 1916: 236 , change of combination. Phyllococcus oahuensis was considered to be extinct by Moir (2021) , but a population was found on Maui in 2007 and the leaf galls were photographed by Dr Karl Magnacca [on Urera glabra , -. viii.2007 , Kahanaiki Gulch below Puu Kukui cabins, Maui, Hawaii ] ( Fig. 1 ). Subsequently, the species was collected in 2012 by Keahi Bustamente on U. glabra in the East Maui Mountains, and this material is described below. These Maui collections represent a new island record for Ph. oahuensis . Note that the recorded host, either as Urera sandwicensis or U. glabra , is now considered to be a synonym of Touchardia sandwicensis (Wedd.) ( POWO 2023 ; Wells et al . 2021 ). Material studied. Lectotype and paralectotypes : 1 slide containing 7 adult females with a single label: “ Cissococcus ? / oahuensis / n.sp. / on Urera sandwichensis [sic] / Tantalus / Oahu / EME 1.30.1911 ”; specimens in fairly good condition (but most slightly distorted by pressure of coverslip); the lectotype , here designated, is the specimen located nearest the edge of the circular coverslip, and is marked with an adjacent black ink spot ( BPBM ). The remaining 6 adult females on the same slide become paralectotypes . Other material studied: 2 slides, each containing 1 adult female and 1 adult male: Hawaii , Mountains nr Koele , Lanai Island , June 1913 , ex herbarium specimens of Urera glabra , coll. C.N. Forbes ; det. J.W. Beardsley (good, but large air bubbles under the coverslips have displaced and tilted some of the specimens). Description below made from 2 slides, each containing 3 adult females labelled: Hawaii , West Maui Mountains , Maui, ex Urera glabra leaf galls, coll. Keahi Bustamente , 22.viii.2012 , det. J. Garcia (good). Note. Although the type series and the material identified by Beardsley were seen by GW, the description and illustrations were made from non-type specimens due to restrictions on the loan of the type slide to CH . We are, however, convinced that the specimens examined from West Maui Mountains are conspecific with those from Oahu .