Malumphy, C.P., & Ostrauskas, H. 2008 Observations on some scale insects (Hemiptera: Coccoidea) collected in Riga, with a revised checklist including three species new for Latvia.. Acta Biologica University Daugavpils 8(1): 107-113

Notes: Collection data are provided for nine species of scale insect collected in Riga during July 2008. Three of these species are reported from Latvia for the first time: Asterodiaspis variolosa and Parthenolecanium rufulum on Quercus robur and Physokermes hemicryphus on Picea abies. A revised checklist of the Coccoidea of Latvia is presented and the total number of species recorded is 58. Forty-four species are native, or at least of European origin, and 14 are introduced species restricted to glasshouses and indoor plantings.