THE SPIDERS OF THE TYNE VALLEY. 399 



reaches an altitude of 7,000 feet in Switzerland. 

 Probably it is really only an alpine variety of 0. mono 

 (Fabr.). 



Oligolophus tridens (C. L. K.). This common and 

 generally distributed animal is abundant in Tynedale. 

 It becomes mature in August and September, some 

 individuals hibernating successfully and appearing again 

 in spring. 



Oligolophus palpinalis (Herbst.). Occasionally found 

 accompanying the last species, to which it is closely 

 related. It is recorded from Dorset, North Wales, 

 Cheshire, Yorkshire, and Edinburgh. Also from France 

 and Germany. It does not seem to be common in Britain. 



Oligolophus Hansenii (Kraep.). Several examples in 

 November amongst dead leaves near Haughton Castle. 

 This Phalangid is only reported from Edinburgh, 

 Nottinghamshire, Yorkshire, and Hamburg. 



Oligolophus agrestis (Meade). Abundant in Tynedale, 

 and adult like its congeners in late summer and autumn. 

 Widely distributed in Britain and on the Continent. 



Family NEMASTOMATID^. 



Nemastoma lugubre (Miiller). Common throughout the 

 British Isles. Adults may be found equally abundantly 

 throughout the year. M. Simon states that its life extends 

 over several years, and its prolonged season of maturity 

 certainly contrasts strongly with the short sexual epoch 

 of the Phalangiidse. 



Nemastoma chrysomeJas (Herm.). Common in late 

 summer and autumn amongst long grass and herbage. 

 1 never found adults at any other season. It occurs in 

 Britain from Dorset to Edinburgh, and accompanies 

 Oligolophus alpimts (Herbst.) to the summits of Scafell 

 Pike and Snowdon. In Switzerland it ascends to an 

 altitude of over 4,000 feet. 



