The Scottish Naturalist. 245 



39. Oidaria Adsequata Bkh. {Emmelesia blandiata SV.) 

 Stgr. and Wk. Lap. ; Sch. Fen. ; Frey Alp. ; Stdfs. Sil. Mont. 



Ordinary form, only with somewhat sharply denned markings. 

 Time of flight is July. 



40. Oidaria Albulata Schiff. and aberr. Thules J.W. 

 (Emmelesia albulata Schiff ". and aberr. Thules J.W.) Stgr. and Wk. 

 Lap. • Wk. Norv. Alp. • Sch. Fen. ; Frey Alp. ; Stdfs. Sil. Mont. ; 

 H. Here. Mont. 



This species also in the Shetland Islands exhibits a very inter- 

 esting modification. It shows a tendency to a yellowish leaden- 

 gray ground colour, which in some examples supplants the white 

 on the upper and under wings (aberr. Thules J.W.). The figures 

 in the Entomologist 1880, pi. 4, figs 4 and 5, show the commence- 

 ment of a transition to such specimens ; I possess some markedly 

 darker, as well as the ordinary form from the Shetland Islands. 

 Mr. MacArthur writes me in answer to a question — "Albulata 

 varies from the ordinary form up to the dark specimens." I there- 

 fore regard Thules J.W. as an aberr. of albulata. It flies in July. 



I received from Dr. Staudinger a very pale pair of specimens 

 from the Caucasus. The male especially is almost snow-white, 

 but the yellowish bands are indicated ; and they offer a curious 

 contrast to the deep leaden-gray specimens of the Shetland Islands ; 

 yet even these have the characteristic sheen on the wings which 

 is peculiar to albulata. Dr. Staudinger writes that he has met 

 with the species near Bossekop (Lapland), flying over the meadows 

 in almost fabulous numbers. I also found them, ten years ago, 

 on the meadows of the Upper Harz in millions, but since that time, 

 it has always been rare there ; the insect must therefore appear 

 only periodically in such numbers. 



41. Oidaria Bilineata L. (Camptogramma bilineata L.) 

 Stdfs. Sil. Mont. 



Somewhat more dull-coloured than our specimens (Hanover.) 

 It flies in July. Entomologist, 1880, plate 4, fig. 8. 



42. Eupithecia Venosata F. var. ; Wk. Norv. Alp. ; Frey 

 Alp. ; Stdfs. Sil. Mont. 



I saw 6 specimens of this variety from the Shetland Islands. 

 The insect, at the first glance, gives quite a different impression 

 from our venosata, and yet it is hard to say in what the difference 

 consists. The ground-colour of the wings is less transparent, not 

 reddish-gray but brownish-gray. The two cross-stripes, usually 



