l66 LÉPIDOPTÉROLOGIE COMPARÉE 



and Fabricius's Gênera însectorum (1777). I am inclined to think 

 that, probably, he had not much idea of the butterfly thèse authors 

 described respectively as iiphon, and davns, or he would hardly 

 hâve given his isïs speci&c rank. This is his description (loc. ciL) : 



" Pa-pilio Isïs. P. D. F., alis integris ferrugineis supra imma- 

 culatis, subtus anticis fascia alba ocelloque soHtario, posticis arcu 

 albo ocelloque sesquialtero. 



" Habitat in Svecia Dom. Delen, alii; in Roslagia, Gedner. 



" Alas intégras, supra ferrugineas seu ferruginege-fuscae unico- 

 loris absque ocellis. Subtus anticae ferrugineas fascia abbreviata alba 

 pone médium, et pone hanc ocellus solitarius; posticae fuscae fascia 

 undata alba in medio et intra marginem ocellus pupillatus cum 

 adjecto puncto albido casco. 



" Simillimus P. pamphïlo, sed duplo fere major, et in pluribus 

 distinctus. " 



Wallengren {Skandinaviens Dagfjàrïlar, 1853, p. 15) will hâve 

 none of ïsis as a species, and classifi.es it as a variety of tï-phon 

 " var. d. " synonymous with /aidion, Bkh. 



" Alas anticae supra pallide ochracesî, cœcas, infra ocello unico, 

 interdum evanescenti, posticas cœcae aut ocello tantum obsoleto ", 

 a concise description of the extrême Scottish form of Ludion. 



Professer C. Aurivillius (Nordens Fjàrilar, p. 36), while asso- 

 ciating the typical tiphon only with southernmost Sweden, and 

 Denmark, shares the opinion of his predecessor and compatriot. 



There are examples, none the less, in the British Muséum Col- 

 lection arranged by Mr. H. J. Elwes as " Var. isïs, Thunb. ". 

 They come from Lapland (? locality); Leech Collection; and 

 North Finland, Schilde; Elwes Collection. They appear to me, 

 however, again to differ only in degree from some of the Scotch 

 laidion in that possibly the gênerai ground colour of the under 

 side is paler more washy grey. Those from St. Petersburg, Grum 

 Grishmailo, classified as intermediates between tiphon and isis, 

 I should include also with laidion owing to the poverty of the 



