Contribution to the knowledge of myrmecophilous beetles (Insecta, Coleoptera) of Latvia Author V, Alexey Author V, Alexander Author Barševskis, Arvids text Linzer biologische Beiträge 2015 2015-12-30 47 2 1829 1842 journal article 10.5281/zenodo.5285902 0253-116X 5285902 Myrmechixenus subterraneus CHEVROLAT , 1835 R e m a r k s: The species is known from Europe and European Russia . For Latvia it was recorded by ULANOWSKI (1884) and MÜTHEL (1889) . As a result of our study, in total we registered 35 species of 8 families from nests of Formica and Lasius : Carabidae LATREILLE, 1802 , Histeridae GYLLENHAL, 1808 , Ptiliidae ERICHSON, 1845 , Staphylinidae LATREILLE, 1802 , Scirtidae FLEMING, 1821 , Latridiidae Erichson, 1842 , Monotomidae LAPORTE DE CASTELNAU, 1840 and Tenebrionidae LATREILLE, 1802 . The dominant family in nests of ants is Staphylinidae , which constitutes 74% of the total number of registered species. For the genus Formica we observed 31 species of beetles, for Lasius - 7 species, four species of which have been observed only for these ants, and three species also met with Formica . Dominant species in nests of Formica are Acrotrichis montandonii (AL.) , Amidobia talpa (HEER) , Lyprocorrhe anceps (ER.) , Thiasophila angulata (ER.) , Leptacinus formicetorum MAERK. and Myrmechixenus subterraneus CHEV. ; in nests of Lasius - Pella limbata (PAYK.) . Almost a third of all observed species from the nests of Formica were represented by only one specimen , from nests of Lasius – three species. The studied fauna of myrmecophilous beetles included five zoogeographical elements with a predominance of Transpalaearctic, European and European-Siberian species: Transpalaearcrtic – 14 species (40%), European-Siberian – 10 species (28.5%), European – 8 species (22.9 %) and Cosmopolites – 3 species (8.5%). Based on the classification of groups of myrmecophilous invertebrates of Wheeler (1910) , all myrmecophilous Coleoptera species which were observed by us in nests of ants can be are divided into the following categories: synechthrans ( Quedius brevis ); neutral synoeketes ( Myrmetes paykulli MARS. , Acrotrichis montandoni (AL.) , Amidobia talpa (HEER) , Lyprocorrhe anceps (Er.) , Notothecta flavipes (GRAV.) , Oxypoda formiceticola MAERK. , Thiasophila angulata (ER.) , Stenus aterrimus (ER.) , Leptacinus formicetorum MAERK. , Corticaria longicollis (ZETT.) , Monotoma spp. , Palorus depressus (F.), Myrmechixenus subterraneus CHEV. ), symphiloid synoeketes ( Dinarda maerkelii KSW. , Pella limbata (PAYK.)) and symphiles ( Scydmaenus hellwigii , Euplectus spp. ). Other species which were registered by us occur in ant-hills only accidentaly, and their occurance depends on the habitat where the nests are located, and the time of year (in autumn, many species use nests of ants for overwintering).