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A new troglobitic species of the genus Antillobisium is described from Sancti Spiritus province, Cuba. Antillobisium tomasi n. sp. is the third known species of the genus and is well characterized by its large size and extremely slender appendages. Biogeographical and ecological considerations on the genus are given. Se describe una nueva especie troglobia del género Antillobisium de la provincia de Sancti Spiritus, Cuba. Antillobisium tomasi n. sp. es la tercera especie conocida del género y está bien caracterizada por su gran tamaño y por sus artejos extremadamente esbeltos en comparación con las otras. Se dan consideraciones biogeográficas y ecológicas sobre el género.

Investigating the soil samples of the Hungarian Natural History Museum collected in the North-Eastern Carpathians, a total of six species belonging to two families were found. One of them, Neobisium brevidigitatum (Beier, 1928) is new for the fauna of Ukraine; a brief description of the new specimen is given. The pseudoscorpion species reported earlier from the region are briefly summarized. According to these new and the preceding literature data the pseudoscorpion fauna of Ukraine now counts twenty-six species.

Only two species of Chthonius (Ephippiochthonius) (Chthoniidae) are presently known from Dobruja, Romania. Among these one should mention Chthonius (Ephippiochthonius) tetrachelatus (Preyssler) (not endemic) and C. (E.) scythicus Georgescu & Capuse (endemic). A new cave species belonging to the genus Chthonius - Chthonius (Ephippiochthonius) borissketi Curcic and Sarbu n. sp., is described from a well nr. Movile Cave, Mangalia, Romania and is endemic to the area studied. Its taxonomic relationships with phenetically close congeners, as well as its comparative morphological traits, are described in detail. [Projekat Ministarstva nauke Republike Srbije, br. 173038]

A careful analysis of samples of pseudoscorpions (Neobisiidae, Pseudoscorpiones) from two underground habitats, one near Trebinje (Herzegovina) and the other from the National Park Paklenica (Croatia), has yielded two species of the genus Roncus L. Koch new to science, Roncus tribunus n. sp. and R. argyrunti n. sp. Both new species are described thoroughly, illustrated, and diagnosed. Some biogeographical and evolutionary characteristics of the two taxa are briefly discussed. [Projekat Ministarstva nauke Republike Srbije, br. 173038]

A new blind false scorpion, Microchthonius kasteli n. sp., from the Mićoletova Jama Pit, Rudine, nr. Kaštel, Dalmatia, has been described. The new pseudoscorpion is different from all other congeners. It is probable that this new taxon is the remain of an old tropical soil fauna, which now inhabits the subtropical area of the Mediterranean seaside. Morphometric ratios, figures, and linear measurements of the new species are presented in detail. [Projekat Ministarstva nauke Republike Srbije, br. 173038]

Pseudoscorpions collected from southern Laos, Champasak Province, are described. One new species of the family Chthoniidae Daday 1888 is identified and illustrated under the name of Tyrannochthonius etu sp. nov. Five species belonging to five family are reported from Laos for the first time: Apocheiridium pelagicum (Redikorzev, 1938), Lagynochthonius tonkinensis (Beier, 1951), Geogarypus longidigitatus (Rainbow, 1897), Nhatrangia dawydoffi Redikorzev, 1938, Indolpium funebrum (Redikorzev, 1938).

Two new species of the genus Stenohya Beier, 1967 are described from China: Stenohya pengae sp. n. (male and female; type locality Daming Mountain, Nanning City, Guangxi Zhuang Autonomous Region) and S. huangi sp. n. (female; type locality Gushan Mountain, Fuzhou City, Fujian Prov.). The presence of S. pengae sp. n. in the tree crown of Castanopsis fabri represents a new habitat for Neobisiidae. A key and a distribution map of the Chinese Stenohya species are also provided.

Two species of troglobitic false scorpions, Roncus meledae n. sp. and Neobisium oculatum n. sp. (Neobisiidae, Pseudoscorpiones), are described from inside underground habitat, i.e. the Jama Na Žutim Kokom Cave, the Island of Mljet, Dalmatia, Croatia. The analyzed pseudoscorpions prove to differ from all other congeners. It is possible that the subterranean pseudoscorpions analyzed represent relicts of an old north tropical faunal pattern of the Mediterranean. [Projekat Ministarstva nauke Republike Srbije, br. 173038]

Two new endemic cave pseudoscorpion species from the Petropavlova Pecina Cave, village Bihovi, 6 km from Trebinje, Herzegovina, are presented, thoroughly described and illustrated. These are named Chthonius (Globochthonius) petroupauli n. sp. and Roncus paulipetrou n. sp. Their main morphometric characteristics and important diagnostic features are analyzed and compared to those of their phylogenetically closest congeners.

A new species of epigean pseudoscorpion pertaining to the genus Chthonius C. L. Koch 1843 from Macedonia is erected. Its relationship to phenetically close congeners is briefly discussed. The new species, Chthonius (Ephippiochthonius) lagadini n. sp. is a relict form presently known only from its type locality (Lagadin, nr. Ohrid, Macedonia).

A new pseudoscorpion from the family Chthoniidae - Chthonius (Chthonius) aquasanctae n. sp. from west Serbia is described. The newly erected taxon is endemic to the area studied. Its taxonomic relationship to its phenetically close congeners Chthonius (Chthonius) lesnik Curcic and Chthonius (Chthonius) iugoslavicus Curcic, as well as the comparative morphological traits, are described in detail.

The pseudoscorpion sample from a cave in Bosnia has been studied. Two new species have been described herein: Chthonius (Chthonius) protobosniacus n. sp. and C. (C.) kladanjensis n. sp. Both taxa are considered endemic of Bosnia and the Balkan Peninsula. In this paper, diagnostic characters of the analyzed forms are thoroughly described and figured. Taxonomic interrelationship amd geographic distribution are briefly discussed.

The pseudoscorpion sample from a cave in Montenegro has been studied. A new species, Chthonius (Globochthonius) medeonis n. sp. is described. A reanalysis of the type material of Chthonius (Ephippiochthonius) polychaetus Hadzi supports its transfer to the subgenus Chthonius (Globochthonius Beier). The species studied is considered to be endemic to the Balkan Peninsula. The diagnostic characteristics of the analyzed taxon are thoroughly described or figured. Taxonomic interrelationships and geographic distribution are briefly discussed.

A new endemic cavernicolous pseudoscorpion species, Neobisium bozidarcurcici, from Vodena Pecina Cave on Mt. Durmitor in Montenegro is described and illustrated. Its morphological characters and diagnostic features are analyzed and compared to those of its phenetically closest congeners, N. davidbengurioni Curcic & Dimitrijevic and N. mendelssohni Curcic & Curcic, from caves on Mt. Durmitor.

A new species of the endemic pseudoscorpion genus Protoneobisium Curcic, 1988, P. basilice sp. n. from Croatia has been found, described and diagnosed. From its phenetically close congener, P. biocovense (M?ller, 1931), the new taxon differs in many respects of both qualitative and quantitative nature. Both species of Protoneobisium have a limited distribution; they inhabit Mt. Biokovo, Croatia, and are probably the remnants of some ancient Maditerranean fauna of pre-Tertiary origin.

A new cave-dwelling species of pseudoscorpion belonging to the family Neobisiidae - Neobisium ninae n. sp. - is described from the Pecina u Dubokom Potoku Cave in the village of Donje Bisevo, near Rozaje in Eastern Montenegro. A diagnosis of the new species is presented. This taxon is a relict and endemic to the area studied. Additionally, some taxonomic and biogeographical traits of the new species are discussed in the light of the evolution of the karst relief of the Balkan Peninsula.

A new species of false scorpion belonging to the family Chthoniidae, Chthonius (Chthonius) globocicae n. sp., is described from a cave in the village of Trnovo, near Virpazar in Montenegro. This endemic form is illustrated, diagnosed, and thoroughly compared to its phenetically closest congener [C. (C.) porevidi Curcic, Makarov & Lucic, 1998] from the area of Krivosije in Montenegro. Additionally, certain diagnostic and other features, taxonomic traits and biogeographical details are briefly discussed in the light of evolution of the karstification process in Montenegro.

El género de pseudoescorpion Cryptocheiridium Chamberlin, 1931 es reportado por primera vez en Colombia, es descrita como nueva especie Cryptocheiridium mairae sp. nov., del noroccidente colombiano, asociada a detritos de hormigas Atta colombica Guérin-Méneville, 1844./ The pseudoscorpion genus Cryptocheiridium Chamberlin, 1931 is reported for the first time in Colombia, is described as new species Cryptocheiridium mairae sp. nov., in northwestern Colombia, associated with debris produced by the leafcutter ant Atta colombica Guérin-Méneville, 1844.

A new cave-dwelling species of pseudoscorpion belonging to the family Neobisiidae - Neobisium rajkodimitrijevici n. sp. - is described from the Rajkova Pecina Cave near Majdanpek in Eastern Serbia. A diagnosis of the new species is presented. This taxon is a relict and endemic to the area studied. Additionally, some taxonomic, biogeographical, and phoretic traits of the new species are discussed in the light of evolution of the karst relief of the Balkan Peninsula.

Two species of pseudoscorpions new to science (Neobisium montisageli n. sp. and Roncus peissei n. sp.), collected in Southeastern France, are described, the diagnostic characteristics are illustrated, and their distribution is given. The possible establishment of two species groups of Roncus in Europe is discussed briefly in view of the importance of some of the diagnostic characteristics. .

A new species of cave-dwelling pseudoscorpions pertaining to the genus Roncus L. Koch, 1873 from Montenegro is erected. Its relations with close congeners are briefly discussed. The new species, Roncus hajnehaj n. sp., is an endemic form presently known only from its type locality (Haj Nehaj Pecina Cave, nr. Sutomore, Montenegro).

A careful analysis of samples of pseudoscorpions (Neobisiidae, Pseudoscorpiones) from two epigean habitats, one near Split (Croatia) and the other on Mt. Orjen (Montenegro), has yielded two species of the genus Roncus L. Koch new to science: Roncus diocletiani n. sp. and R. orjensis n. sp. Both new species are described, thoroughly illustrated, and diagnosed. Some biogeographical and evolutionary characteristics of the two taxa are briefly discussed.

Summary Many Collembola species are characterised by an aggregative behaviour, which is closely related to communication and co-ordination between individuals. In spite of a general heavy predation pressure, a large number of Collembola is found in soil suggesting that they have developed defence strategies against predators. This study investigates changes in spatial structure of gregarious Collembola species in presence of a predator. It is analysed if the gregarious lifestyle of Collembola populations functions as a defence strategy against predation. In presence of a predator distances between individuals in the Collembola species Folsomia candida and Heteromurus tetrophthalmus became closer, reducing the risk of individuals to be captured by predators. On the contrary, Onychiurus sinensis specimens, which were never caught probably because of the extrusion of repelling fluids by means of their pseudocelli, moved away from each another. Besides being a successful chemical defence against predation, repelling fluid secretion may effectively repel conspecifics, thereby keeping individuals at greater distance.

Two species of Roncus L. Koch, 1873 (Neobisiidae), new to science (R. ciobanmos n. sp. and R. dragobeten. sp.), and one species of Neobisium Chamberlin, 1930 [N. (N). biharicum Beier, 1939], collected in the Movile Cave, southern Dobrogea, Romania, have been described, diagnostic characters illustrated, and their geographic distribution analyzed. In addition, the description of Chthonius (Chthonius) monicae Boghean, 1989 (Chthoniidae), otherwise known only from two females, has been amended. The possible relationships of these species are discussed in view of the importance of some diagnostic characters and of the evolution of their cave habitat.