NOTES ON ARACHNIDA ON THE N.E. COAST 

 OF YORKSHIRE. 



wm. falconer, 



Slaithivaite, Huddersfield. 



Of the three great divisions of Yorkshire, the North Riding 

 has had the least attention paid to its spider population, so that 

 a few notes of captures made on its north-east coast in August 

 last may not be without interest. Altogether, eighty species 

 of true spiders were met with, of which (.-1 ) four have not before 

 been found in any part of the county ; {B) seven others also 

 new to the North Riding ; and (C) six more, for which there is 

 but one North Riding record, though they have, with one excep- 

 tion, been observed more abundantly in the other divisions. 

 A. — New to Yorkshire. 



Micronda innotabilis Camb., one male, on the trunk of a 

 larch in the wood leading out of Riftswood to Skelton. 



Cnephalo cotes inter jectus Camb., many examples of both 

 sexes, on the coast a little east of Redcar. 



Troxochriis cirrijrons Camb., two males, eleven females, 

 on the coast west of Marske. ' 



Cornicularia vigilax Bl. One female in Coatham Marshes. 

 All are local or rare British spiders, but the most interesting 

 is T. cirrifrons Camb. It is usually found in the company of 

 T. scabvicitlus Westr., and there is considerable diversity of 

 opinion as to whether the two should be looked upon as one 

 species with dimorphous males, or as distinct species. There 

 are striking differences between the males, but up to the present 

 it has been thought that none existed between the females, 

 the latter being apparently indistinguishable from each other. 

 The Rev. O. Pickard-Cambridge states, however, in a letter 

 to the writer, that he has lately discovered a discriminatory 

 character, which is fairly constant in the specimens he has 

 examined, and certainly on comparing the above females with 

 others, obtained along with T. scahriculus, there is a consider- 

 able amount of difference between them. 

 B. — New^ to North Riding. 



Clubiona pallidiila Clerck. One female near Saltburn. 



Agroeca proxima Camb., Both sexes, amongst herbage on 

 the cliff adjacent to Marske Cemetery. 



Enoplognatha iJioracica Hahn. One female in Coatham 

 Marshes. There is one other Yorkshire record only — 

 a female, North Cave, East Riding. 



1910 Jan. I. 



