The present study summarizes the previous limited knowledge on the genus Eustigmaeus from Greece. Based on material collected from many localities, nine species are recorded from Greece for the first time and four species, Eustigmaeus irregularis sp. nov., E. fantinoui sp. nov., E. microvacuolatus sp. nov., and E. capitatus sp. nov. are described as new to science. Additionally, males of five known species of Eustigmaeus are described for the first time. A list of the world species of the genus Eustigmaeus and a key to species of this genus recorded in Greece are provided.

The genus Stigmaeus Koch (Acari: Stigmaeidae) is reported for the first time in Greece. Based on material collected from many localities, fifteen species are recorded from Greece for the first time and five species, Stigmaeus canestrinii sp. nov., S. kochi sp. nov., S. claviformis sp. nov., S. pseudoangustus sp. nov. and S. graminis sp. nov. are described as new to science. Additionally, males of two known species of Stigmaeus are described for the first time. A key to species of this genus recorded in Greece is provided.

Horse chestnut, Aesculus hippocastanum L. (Sapindaceae), is a large deciduous tree native to a small area in the Pindus Mountain mixed forests and the Balkan mixed forests of Southeast Europe. It was introduced to most countries in Europe mainly for ornamental purposes. The aim of the present study was to assess the occurrence, species composition and population densities of phytoseiid mites on A. hippocastanum in countries where this tree species is autochthonous and to compare them with Central Europe. In addition, we tested whether the horse chestnut leaf miner, Cameraria ohridella or the horse chestnut leaf blotch, Guignardia aesculi has any effect on Phytoseiidae population density. Leaf samples were collected in the cities of České Budějovice, Czech Republic and Orestiada, Greece in September 2013 and 2015, respectively. Thirty compound leaves were randomly taken from tree branches up to 2.5 m above ground in both localities. Mites were collected by washing the leaves in ethanol and were then mounted in lactic acid and identified. A total of 441 specimens of phytoseiid mites belonging to six species (Euseius finlandicus, Neoseiulella tiliarum, Kampimodromus aberrans, Paraseiulus talbii, Phytoseius macropilis and Typhlodromus (Typhlodromus) pyri) were collected. A significantly higher population density of Phytoseiidae was found in České Budějovice. The density was not affected by the horse chestnut leaf miner, Cameraria ohridella or the horse chestnut leaf blotch, Guignardia aesculi. Euseius finlandicus was the predominant species in both České Budějovice (96.8%) and Orestiada (48.4%) where, however, it competed with K. aberrans (42.9%).

Four species of phytoseiid mites namely Neoseiulus knappi Zannou, Moraes, Ueckermann& Oliveira, Typhlodromus (Typhlodromus) octogenipilus Kreiter, Tixier & Duso, Typhlodromus (T.) phialatus Athias-Henriot, and Typhloseiella isotricha (Athias-Henriot) are recorded for the first time from Turkey. Two new species Neoseiulus sekeroglui Döker & Stathakis n. sp. and Typhlodromus (Typhlodromus) antakyaensis Stathakis & Döker n. sp. are described and illustrated. A key to the all known phytoseiid species for the Turkish fauna is also provided.

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Two new species, Neoseiulus elisiensis n. sp. and Neoseiulus neomarginatus n. sp., are described from Greece. Neoseiulus leucophaeus (Athias-Henriot) is re-described and illustrated based on specimens collected on Thymelaea hirsuta (L.) Endl. A key to all species of the genus Neoseiulus Hughes reported from Greece is provided.

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