A new species, Roncus satoi CURCIC et DIMITRIJEVIC (Arachnida: Pseudoscorpiones: Neobisiidae), is described from southwestern Serbia, Yugoslavia. It is illustrated and compared with its nearest known congener, R. strahor CURCIC, from southeastern Serbia (Yugoslavia). Notes are given on habitats, distributions, characters, and future studies of Roncus species.
Anomalies in the pedal segmentation patterns were studied in Neobisiumcarpaticum BEIER and Roncus pannonius CURCIC, DIMITRIJEVIC et KARAMATA (Neobisiidae), inhabiting Yugoslavia. A total of 10 abnormal examples were found out of 7, 280 specimens examined. The frequency of the aberrant specimens was variable, depending on the growth stage, sex, and species. In N. carpaticum, the following malformations were noted: partial atrophy, atrophy, and symphysopody; and combinations of different deficiencies [combined atrophy and symphysopody; combined partial division and partial symphysopody; and combined partial atrophy, symphysopody, and schistomely (or heteromorphosis)]. In R. pannonius, however, only symphysopody as well as two combined anomalies (multiple atrophy; and combined atrophy and symphysopody) were found. Teratological variation of the pedal podomeres has been confined only to adults. Additionally, some specific features of the relative distribution of various pedal anomalies are considered. Finally, the probable causes of the origin and development of pedal anomalies in the pseudoscorpions studied have been also discussed.