Yorkshire Naturalists' Union : Annual Report, igii. 29 



(i) Careful record of localities examined with lists of 

 specimens and exact position of plant-beds. 



(2) Investigation of new localities, especially inland. 



(3) Detailed study of certain species in association w^ith 



others. 



(4) Search for specimens shewing structure. 



Professor Seward and Mr. Thomas have kindly undertaken 

 to describe and determine specimens. 



The work done has been more or less preliminary up to the 

 present, but several promising inland beds hitherto unknown or 

 unworked have been discovered, and are being investigated. 



OTHER COMIVIITTEES. 



Yorkshire Arachnida Committee. — Mr. Falconer writes : — 

 The exceptional weather in the past year has not been without its 

 effect on spider life. In some districts, where the situation and 

 geological formation tended to conditions of excessive dryness, 

 individuals have been less plentiful than usual ; but in others, 

 where, in spite of the long drought, some degree of moisture was 

 retained, the reverse has been the case. 



Not only has the distributional range of many rare species 

 been extended during the year, but 13 species new to the county 

 have also been discovered, viz., in the N. Riding, 5, Entelecara 

 thorellii Westr., Hypselistes jacksonii Camb., Troxochrus ignobilis 

 Camb., Xysticus sabulosus Hahn, Ero camhridgii Kulcz ; in the 

 E. Riding, 3, Theridion impressimi L. Koch, Bathyphantes 

 setiger F. O. P., Camb., Pirata latitans Bl. ; and in the W. 

 Riding, 5, Diplocephalus protnberans Camb. ($ new to Britain), 

 D. castaneipes Sim., Arceoncus crassiceps Westr., Epeira sturmii 

 Hahm, and Pisaura mirahilis Clerck. For particulars of these, 

 with one exception,' reference should be made to " New and Rare 

 Yorkshire Spiders " (" Naturalist," August 1911, pp. 283-8). 

 The Hypselistes nov. sp. there noted, appears from information 

 since received, to have been an error, and must therefore be 

 deleted, so that the total for the county is 309. 



Further details of the Committee's work will appear elsewhere 

 in 'The Naturalist.' 



Committee of Suggestions for Research. — It is gratifying to 

 record that suggestions for special observations made by the 

 Committee are bearing fruit, and much attention has been paid 

 to definite distribution problems during the Union's Excursions. 



Appeals for advice for definite lines of work by local societies 

 have .been received, and the suggestions given are being carried 

 out. 



The Yorkshire Micro-Zoology and Micro-Botany Committee.— 

 The interest in the work of this Committee is kept up by a few of 

 its members, individually. Some of the work was recorded in 

 '■ The Naturalist " ; more will shortly appear. Young recruit^s 

 are desired. 



1912 Jan. I. 



