1^4 The Scottish Naturalist. 



also occur with white stigmas, whitish front margin, and whitish 

 mid-vein (sagitta) {Entomologist, 1884; plate 1, fig. 3); also, quite 

 uniformly dark-brown specimens occur, in which only the stigmas 

 have a margin of yellow, {obscure). {Entomologist, 1884; August 

 and September; plate 1, fig. 2.) 



16. Agrotis OCCTllta L. {Aplecta Occulta L.) Stgr. Gronl. ; 

 Mosch. Labr. ; Sch. Fen.; Frey Alp.; Stdfs. Sil. Mont.; H. Here. 

 Mont.; Stgr. and Wk. Cat. Lap. Pale specimens occur like those 

 of the South of England. The black form of the Scottish moun- 

 tains, which appears also with us in mountainous regions, e.g. 

 Upper Harz, was not captured. July. 



17. Chareas graminis L. Stgr. Isl.; Stgr. Gronl.; Stgr. and 

 Wk. Lap.; Sch. Fen.; Frey Alp.; Stdfs. Sil. Mont.; H. Here. 

 Mont.; Stgr. and Wk. Cat. Labr. Ordinary form, end of July and 

 August. Unfortunately I was unable to examine this species, 

 among which there are said to be very dark specimens, pro- 

 bably Latenai, which also appears in the Upper Harz, along with 

 the type form, in May and June. 



* 18. Dianthoecia nana Hufn. var. {Diantlwecia conspersa 

 S.V.) Wk. Norv. Alp.; Frey Alp.; Stdfs. Sil. Mont.; Spr. Verbr. 

 Lap. 



The darkest specimens of this curious Shetland form could 

 scarcely be considered as nana, were it not that the paler ones 

 formed a transition. I saw three males, which in comparison with 

 the type form must be characterised in the following way : — 

 Ground colour, a paler or darker lead grey, washed over with a 

 greenish yellow. The white marks of the type form are visible on 

 the upper wings of the palest specimen, as well as the orbicular and 

 reniform stigmas ; the white spots on the inner margin and the 

 white outlines of the wavy lines are also faintly shown ; and traces 

 of white colouring are found on head, collar, shoulder-lappets, and 

 nuchal crest. In the second specimen, white markings quite dis- 

 appear from the wings, and only on the head and thorax do they 

 still remain visible. In the third (darkest) specimen, the white 

 colouring has entirely disappeared even from the head and thorax, 

 and the colour is simply leaden grey, washed over with faint 

 greenish yellow. The orbicular and reniform stigmas are outlined 

 with black ; the two double cross lines and the arrow marking of 

 the wavy lines are black. Mr. Mac Arthur answers my question, 

 whether the common form does not also occur in the islands. 



