Io6 LÉPIDOPTÉROLOGIE COMPARÉE 



(= phïloxenus; cp. infra)... " and the paler more slightly marked 

 forms found in Scotland " (= laidiori). 



Of the tïpJîon moors Mr. Robson also makes a graphie sketch. 

 " It was called a moor — Greenleighton Moor ■ — ■ but it was a 

 bog to ail intents and purposes... Patches of red attracted my 

 attention, and stooping down to examine them, I found thèse were 

 plants of the round-leaved sun-dew {Dr osera rotundiflorà)... 

 sweet-gale or bog-myrtle {Myrica gale) was there but not abun- 

 dant, and I had the pleasure of seeing the bog-asphodel 

 (J^arthecium ossifragum), a lovely flower, for the first time... 

 C. davus was tolerably abundant, and we might hâve secured a 

 goodly number had the sun shone brightly but it gradually grew 

 more cloudy and at last my friend called my attention to what 

 was evidently rain falling on the Simonside Hills. " " C. tiphon 

 from this locality ", he continues, " is somewhat intermediate 

 between the Lancashire and the Scotch forms "; a diagnosis to 

 some extent supported by Dr. Buckell who regards his Morpeth 

 spécimens, however, as intermediate between the Middle and 

 Northern Forms. 



Crossing the Tyne valley into Durham, the hill marshes of the 

 west and south-west continue the link of distribution. Mr. J. Arkle 

 reports of some examples from near Wallington, '* not such a good 

 form, I thought, as that taken in Delamere Forest (Cheshire), and 

 North Lancashire " ( = again philoxenus; cp. infrà). 



But, once across the Tees river, the butterfly line, so to speak, 

 divides. Drawing westward by the Pennine range of mountains 

 through Hawes and Wensleydale (N. Yorkshire) tiphon illides 

 with the intermediates of Cumberland, and the phïloxenus of south 

 Westmoreland and Lancashire. South-east by the coast, and the 

 moors of North Yorkshire, it maintains the typical Middle Form, 

 occurring on the mosses of the Esk at Robin Hoods Bay, and by 

 Scarborough, south through the Wolds or uplands by Beverley — 

 the late Mr. J. C. Dale took it at Cottingham near Hull — across 

 the Humber to Thorne Waste and westward again to Rotherham, 

 the Southern limit of the butterfly in this direction. For I cannot 



