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SUMMARY Samples of the invasive alien ladybird, Harmonia axyridis , were col-lected between 27 July and 8 August 2013 at four localities on the Pel-jesac Peninsula in southern Croatia. Altogether, 209 individuals were collected, of which 114 (54.5%) were males and 95 (45.5%) females. ree colour forms were present in the samples: the non-melanic form succinea and the melanic forms spectabilis and conspicua . &e form suc-cinea clearly predominated (90.5% of collected individuals) followed by spectabilis (8.1%) and conspicua (1.4%). &e ectoparasitic fungus He-speromyces virescens , not previously reported from Croatia, was found on the elytron of one H. axyridis individual. &e localities in Peljesac Peninsula mentioned in this paper are the southernmost of all Croatian localities so far reported to be colonized by H. axyridis . Introduction &e harlequin ladybird, Harmonia axyridis (Pallas), is a well known invasive species of Asiatic origin that threatens biodiversity in invaded areas, causes some economic losses in horticulture and winemaking and is a nuisance and health problem to some people (Kovach 2004, Koch & Galvan 2008, Roy et al. 2012). Being a voracious predator of aphids and other so-bodied arthro-pods that are o*en important agricultural pests, H. axyridis was com-monly used in the 20th century as a biological control agent. Despi-te numerous introductions of this species in many parts of the world, starting with the introduction in 1916 in California (USA), for a long time H. axyridis could not establish anywhere outside its native range (Brown et al. 2008). In 1988, however, an established population of H. axyridis was detected in southeastern Louisiana, USA (Chapin & Brou 1991). From this initial nding a rapid spread of the beetle has been ob-served, at the beginning in North America and later also in other conti-nents, including Europe, South America and Africa (Brown et al. 2011).

Population of the invasive harlequin ladybird Harmonia axyridis (Coleoptera: Coccinellidae) from Pelješac Peninsula, southern Croatia