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III. 0?i the Distrihutiou of Lepidoptera in Great 

 Britain and Ireland. By Herbert Jenner Fust, 

 Junr,, M.A. 



[Read 18tli February, 1867— 6th January, 1868.] 



Mr. H. C. Watson, in his great work on '' British Plants, 

 and their Geographical Relations" — the Cyhele Britan- 

 nica — has divided Britain into eighteen provinces, and 

 these again into thirty-eight sub-provinces. These divisions 

 have been adopted by Mr. A. Gr. More and others engaged 

 in investigations of a similar nature, and for the sake of 

 uniformity will be employed here. "It is to be remem- 

 bered," says Mr. Watson (C. B. vol. i. p. 18), "that 

 these provinces are only arbitrary sections, adopted for 

 convenience in description and reference, instead of 

 counties. So far as they do corres]iond with peculiarities 

 in the pliysical geography of Britain, it is an advan- 

 tageous circumstance ; although such a correspondence 

 is not necessary to their object or use." This passage is 

 quoted to show that not being in any way botanical 

 divisions, they are just as applicable to the investigation 

 of tlie distribution of insects as of plants. 



The following is the arrangement referred to : — 



List of Provinces and their included Counties. 

 (See Plate X.) 



1. Peninsula. — Cornwall, Devon, Somerset. 



2. Channel. — Dorset, Wilts, Isle of Wight, Hants, 



Sussex. 



3. Thames. — Kent, Surrey, Berks, Oxford, Bucks, 



Middlesex, Heists, Essex. 



4. use.— Suffolk, Norfolk, CVimbridgc, Bedford, 



Huntingdon, Northam])ton . 



5. Severn. — Gloucester, Worcester, Warwick, Staf- 



ford, Salop, Hereford, Monmouth. 



0. South AVales. — Glamorgan, Caermartheu, Pem- 

 broke, Cardigan, Brecon, Radnor. 



TR. ENT. SOC. third SERIES, VOL. IV. PART IV. FEB. 18G8. 



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