ADDITIONS TO BRITISH LEPIDOPTERA. 185 



ments entirely with the Sardinian ichnusa and polaris form are 

 still required ; but we have still succeeded in several cases in 

 more or less completely producing the ichnusa form by heat and 

 the polaris form by cold from our intermediate German form. 



The darker colouring of the polar form scarcely depends on 

 adaptation, or is Lord Walsingham's interpretation correct, 

 according to which the duskier colouring of the arctic butterflies 

 is considered as a protection from temperature? In this case 

 we must expect that the dark colouring of this var. polaris still 

 remains constant at a high temperature, as the scale-determi- 

 nants in question would then be directed once for all to the pro- 

 duction of black. Before experiments have disproved such a 

 state of affairs, I might regard the change in the darkness of 

 Vanessa urticce as the direct result, biologically without signi- 

 ficaoce, of the action of different degrees of temperature on the 

 wings in the course of development. But heat-experiments with 

 the arctic brood would be quite as desirable as cold-experiments 

 with the Sardinian. 



Thus we have before us, in Chrysophanus phloeas and Vanessa 

 urticcey species which, according to the present position of our 

 view, exhibit direct seasonal or climatic dimorphism ; and it is 

 interesting, that — as I brought forward years ago— the direct 

 action of a higher temperature has just the opposite result in 

 the one species to what it has in the other : phloeas is blackened 

 by heat, urticce becomes brighter and more fiery from the same 

 cause. We cannot, therefore, say generally how often and how 

 repeatedly this has happened : that heat darkens the colours of 

 butterflies. 



(To be continued.) 



REMARKS ON ''ADDITIONS to the BRITISH LEPIDOPTERA 

 DURING THE PAST TEN YEARS." 



By Eustace R. Bankes, M.A., F.E.S. 



As the list of "Additions to the British Lepidoptera during 

 the past Ten Years," published in the 'Entomologist,' xxvii. 342-5 

 (1894), was to some extent compiled from notes and information 

 supplied to Mr. South by myself, I may perhaps be allowed to 

 supply a few omissions that I notice, and corrections, &c., that 

 should be made. Species formerly omitted are marked thus *. 



Sesia conopiformis, Esp., must apparently be struck out. 

 Although Mr. C. W. Dale has not yet cancelled his note in 

 Entom. xxvii. 245, I learn that it was decided at the meeting 

 of the Ent. Soc. London, at which he exhibited the specimen 



ENTOM. JUNE, 1896. P 



