220 THE KNTOMOLOGI8T. 



The ants found attendant upon these hirvae were black, and 

 of a different species from those discovered associated with the 

 larvse of corydon at Eeigate, which were Formica Jlava ; oddly 

 enough, however, I was unsuccessful in my efforts to obtain a 

 demonstration of the function of the gland by means of these 

 black ants, some of which I brought with me on my return from 

 Folkestone, while complete success attended the first attempt 

 when an example of F. Jiava — taken from a nest introduced 

 some time ago into my garden for the purpose of experimenting 

 with the larvce of L. aiion — was made the medium. 



Possibly jiava — which is common on the ieZZa/r/ws-affected 

 hillslopes at Folkestone — is more generally associated with these 

 Lycsenid larvae than are other species of ants, and the instinct 

 for "nursing" more highly developed than is the case with the 

 black ants referred to, which have been identified for me as 

 workers of Lasius niger. 



That ants are not essential to the well-being of corydon or 

 bellargus appears to be certain, as both species have, I believe, 

 been successfully reared through from the egg without any inter- 

 vention or assistance from them, and a brood of the latter 

 species, reared by me last year from ova deposited in captivity, 

 were kept under conditions which certainly precluded the possi- 

 bility of their aid. It appears probable, nevertheless, that under 

 entirely normal conditions ants may protect the larvfe in some 

 measure from the attacks of their natural enemies, and, if that 

 be so, the relationship would seem to be a mutually advan- 

 tageous one. 



Wallington : Sept. 19th, 1906. 



SOME NOTES ON SCANDINAVIAN AND LAPLAND 

 BUTTEEFLIES. 



By H. Rowland-Brown, M.A., F.E.S. 



(plate VI.) 



My plans for an entomological excursion to Sweden had 

 been carefully arranged before I left England, and arrived at 

 Gotenburg in the middle of June last. My original itinerary 

 comprised an expedition to Narvik, the terminus of the Ofoten 

 Eailway, crossing thence to Swedish Lapland, and reaching 

 Abisko on the Tornea Lake about the end of the month. But 

 advices from Herr J. Sparre- Schneider at Tromso, who kindly 

 furnished with much local information, decided me to reverse 

 the order of my going. The season of 1906 in the higher north, 

 owing to the depth and quantity of the snow, was evidently very 



