Cerobasis guestfalica (Kolbe, 1880)

Lienhard, Charles & Mifsud, David, 2015, Psocids from Malta (Insecta: Psocodea: ‘ Psocoptera’), with new synonymy for Peripsocus stagnivagus based on the discovery of its first Palaearctic male, Zootaxa 3936 (2), pp. 251-260 : 252

Cerobasis guestfalica (Kolbe, 1880)

Material examined. Malta, Buskett Gardens, 2 km S of Rabat, 15. vii.1997, 1 ♀, DB; Buskett, 27. x.2014, 1 ♀, under bark of Pinus halepensis , DM; Fomm ir-Riħ, 29. x.2014, 1 ♀, beating vegetation, DM; Verdala Palace, 12–24.vi.2014, 83 ♀, Malaise trap, DM; same data but 25.vi.–10.vii.2014, 45 ♀; 11.vii.–1. viii.2014, 30 ♀; 1–15.viii.2014, 235 ♀; 15–30.viii.2014, 164 ♀; and 1–30.ix.2014, 363 ♀.

Notes. A new record for the Maltese Islands. Only females of this almost cosmopolitan parthenogenetic (thelytokous) species have been collected in Malta; males are extremely rare ( Lienhard 1998). The species is often abundant on the bark of various trees and woody shrubs, in herbaceous leaf litter and sometimes in human habitation ( Lienhard 1998).