This paper is the sixth of the series of “Lycosid spiders of Japan”, and the following one species is dealt with: Xerolycosa nemoralis (WESTRING). This species is redescribed and illustrated based on the newly collected materials from various localities in Japan. Its biology is also briefly described.
The nymphs of Spermophora senoculata (DUGÈS) were reared under 3 different photoperiods; natural, long (LD-16:8) and short (LD-10:14). Upon rearing under natural and long photoperiods, there was no difference in the developmental process. Upon rearing under a short photoperiod, however, development showed a retardation of 50-70 days due to prolongation of all instars other than the last one as compared with that under the other conditions.
Upon rearing under natural conditions and at 25°C with a long (LD-16:8) photoperiod, the nymphs of Pholcus crypticolens developed into adults in 45-85 days. Upon rearing at 25°C with a short (LD-10:14) photoperiod, however, they required 90-175 days for development. This remarkable developmental delay under a short photoperiod resulted from prolongation of the last instar.
A new species of the genus Gnomulus is described under the name of G. minor from Luzon, the Philippines. This is the first member of the genus and the third of the family Oncopodidae (Opiliones: Laniatores) to be reported from the Philippines.