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The morphological ontogeny of Oribatella hungarica Balogh, 1943 is described and illustrated. The nymphs of this species are apopheredermous, i.e. they carry the exuvial scalps of previous instars away from the dorsal integument, using modified setal pair da. The larva has 12 pairs of gastronotal setae, most of them have long barbs, except for c3 with short barbs and minute h3, whereas the nymphs have 13 pairs with short barbs (dm and dp are lacking). In the tritonymph, leg seta d on all femora and genu IV, l” on femora I and II and pair l on genua and tibiae I and II, l’ on femur III and genua and tibiae III and IV, and ft on tarsi II–IV are thicker than other setae on these segments. In all juveniles, a humeral organ is present. In the adult, epimeral seta 4c and leg seta l” on genua and tibiae I and II, and l’ on genu III and genu and tibia IV are thickened.

This paper presents the results of a comparative study on the major groups of mites associated with ants in two different areas (hilly and mountain) of the Argeș basin. Mites from order Gamasida (Suborders Uropodina and Gamasina) and order Oribatida, and the ant fauna (Order Hymenoptera, family Formicidae) were investigated. Out of 31 mite species identified, Oplitis hutae is new to science (Constantinescu, in press), five are recorded for the first time in the Romanian fauna, and two for the second time. Also, one of the host ant species, Lasius sabularum is recorded for the second time in the Romanian myrmecofauna. In addition to the faunistic synopsis, a brief ecological and zoogeographical characterization is presented.Résumé. L'article présente les résultats d'une étude comparative sur les principaux groupes d'acariens associés aux fourmis, dans deux zones différents (collines et montagnes) du bassin d'Argeş. Les acariens de l'Ordre Gamasida (Sousordres Uropodina et Gamasina) et de l'Ordre Oribatida, et la faune des fourmis (Ordre Hymenoptera, Famille Formicidae) ont été étudiés. Parmi les 31 espèces d'acariens identifiées, Oplitis hutae est nouvelle pour la science (Constantinescu, sous presse), cinq sont enregistrées pour la première fois dans la faune de Roumanie et deux autres espèces pour la deuxième fois. Aussi, l'une des espèces de fourmis hôte, Lasius sabularum est enregistrée pour la deuxième fois dans le myrmécofaune de Roumanie. En plus de la synthèse faunistique, une brève caractérisation écologique et zoogéographique a été réalisée.

The morphological ontogeny of Punctoribates astrachanicus Shaldybina, 1973 is described and illustrated. This species was rarely investigated since its description, including its ecological and biological aspects. The adult has fusiform bothridial seta, straight anterior tectum of notogaster, four pairs of saccules, and notogastral setae mostly alveolar, except for short p-series. Tarsus I has a short dorsal projection. Juveniles of this species are light brown, with short and thin prodorsal seta ex, and relatively large humeral organ. The gastronotal setae of larva are of medium size and pointed, in nymphs they are short.

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