Five species of ticks belonging to the genera Amblyomma, Haemaphysalis and Rhipicephalus were recorded from endemic and exotic wild mammals in the Esteros del Iberá wetlands, Argentina. Adults and immature stages of Amblyomma dubitatum were found on Hydrochoerus hydrochaeris, Sus scrofa, Axis axis and Myrmecophaga tridactyla. Larvae and nymphs of A. dubitatum were collected on Bubalus bubalis, Lepus europaeus, Monodelphis dimidiata and on the rodents Cavia aperea, Scapteromys aquaticus, Oligoryzomys flavescens and Akodon azarae. One male of Amblyomma nodosum was associated with M. tridactyla; specimens of Haemaphysalis juxtakochi were found on A. axis, S. scrofa and Mazama gouazoubira; and Rhipicephalus (Boophilus) microplus was detected on Blastocerus dichotomus. Adults of Amblyomma triste were collected on B. dichotomus, S. scrofa and H. hydrochaeris, while immatures of this tick were recorded on M. dimidiata, A. azarae, S. aquaticus, O. flavescens and H. hydrochaeris. In addition to elucidating tick-host associations, the findings of this survey are biomedically important. Although the tick fauna of Esteros del Iberá is limited, some species, such as A. triste and R. (B.) microplus, are recognized vectors of pathogenic agents infecting humans and animals. Also, a large number of the Esteros del Iberá collection records were for ticks from exotic (S. scrofa, A. axis, B. bubalis, L. europaeus) or reintroduced (M. tridactyla) mammals, suggesting that the introduction of these mammals may result in the amplification of tick populations in the study area, with potential deleterious effects on the endemic fauna.

Forty-two specimens of three tick species — Dermacentor albipictus, D. variabilis, and Ixodes cookei — were collected from a single road-killed male American mink, Neovison vison, in Leake County, Mississippi, U.S.A. The D. albipictus and I. cookei collections are new county records. This is the first report of tick collections anywhere in Mississippi from a mink.

The male of Transeius avetianae (Arutunjan & Ohandjanian), collected in Zanjan Province, Iran is described for the first time. The female is re-described from a collection large enough (n = 67) to examine morphometric variations. The measurements of female morphological characters collected from Iran are compared with those given in the original description from Armenia. A key to the species of Transeius recorded from Iran is also given.

Cydnoseius negevi (Swirski & Amitai, 1961), Neoseiulus paspalivorus (De Leon, 1957) and Proprioseiopsis beatus (Chaudhri, 1968) are reported for the first time from Saudi Arabia. The mite genus Cydnoseius Muma, 1967 is also new to the Saudi Arabian fauna. Cydnoseius negevi was collected from various host plants in three different regions (Riyadh, Hail, Eastern region) while N. paspalivorus and P. beatus were collected from Cynodon dactylon L. (Poaceae) in date palm orchards in Riyadh and Eastern region respectively. A key is provided to the adult females of the known species of Phytoseiidae of Saudi Arabia.

Two new oribatid mite species, Hermannobates bifurcatus sp. nov. (Hermanniellidae) and Xenillus brevisetosus sp. nov. (Liacaridae), are described from Ecuador. Hermannobates bifurcatus sp. nov. is similar to Hermannobates monstruosus Hammer in having the combination of a tuberculate prodorsum, foveolate notogaster, and long setiform prodorsal and exuvial notogastral setae and sensilli. However it clearly differs from the latter by having some bifurcate epimeral setae, the surface of the prodorsum, and the lengths of some notogastral setae. Xenillus brevisetosus sp. nov. is similar to Xenillus davisorum J. & P. Balogh in having the combination of the same body surface sculpture and the morphology of the lamellar complex, sensilli, and prodorsal and notogastral setae. However it clearly differs from the latter by the length of the lamellar cusps, interlamellar setae and notogastral setae h₁, and number of genital setae. An identification key to Ecuadorian species of Xenillus is presented.

The morphology of the juvenile instars of two species of the oribatid mite family Lohmanniidae, Meristacaris sundensis Hammer, 1979 and Cryptacarus promecus Grandjean, 1950 is described and illustrated. We collate data on the morphology of lohmanniid juvenile instars whose complete ontogeny is known, and show that genera are readily identifiable from their juvenile features. The main generic distinctions are presented by the body surface, the morphology and number of body setae, and the structure of the rostrum and genital plates.

Two new oribatid mite species, Austrocarabodes (Uluguroides) kluttzi Ermilov, Winchester, Lowman & Wassie sp. nov. (Carabodidae) and Pilobatella lowmanae Ermilov, Winchester & Wassie sp. nov. (Haplozetidae), are described from Afro-montane forests in the northern highlands of Ethiopia. An identification key to all known species of Pilobatella is given. An annotated checklist of identified oribatid mite taxa sampled in this studyis presented. Fourteen species, six genera and three families are recorded for the first time from Ethiopia.

A new species, Fusohericia heliconiae, is described and illustrated from adults and phoretic deutonymphs collected from Heliconia imbricata flower bracts at La Selva Biological Station and Reserve, Heredia Province, Costa Rica. Notes on the biology of F. heliconiae are also presented.

A detailed description and illustration of Oulenzia arboricola (Oudemans, 1928) are provided based on the type specimen collected on Hevea leaves, from Medan, Deli, Sumatra (Indonesia). The definition of the genus Oulenzia is clarified and the taxonomic position of species under Oulenzia is discussed.

Erythraeus (Erythraeus) albanicus sp. nov. is described from Albania and belongs to the group of species having the basifemoral setal formula 3-3-3. Leptus (Leptus) josifovi is new to the fauna of Albania and Montenegro, Hauptmannia kotorensis is new to the fauna of Albania, H. stanislavae, Abrolophus quisquiliarus, Balaustium nikae, Erythraeus (Zaracarus) budapestensis and Charletonia cardinalis are new to the fauna of Serbia and Allothrombium meridionale is new to the fauna of Macedonia. New records are given for A. fuliginosum from Macedonia and Serbia.

A new species of the genus Momonides Lundblad, 1941 is described from Ghana. This is the first record of the genus from the Afrotropical region.

From South Australia, a second species of the Australian genus Austrotrombella is described. It differs most noticeably from the sole known species of the genus in the number of acetabula, making an emendation of the genus diagnosis necessary.