The beautiful species figured in illustration of the Genus 

 was first noticed, I believe, by Harris in his Aurelian as an in- 

 habitant of this island ; it was afterwards taken by Mr. Ha- 

 worth in Yorkshire, since which Mr. Dale has met with it in 

 Hampshire ; and during a late visit to that county he was so 

 obliging as to point out the locality to me. 



The figure in Der Gamlmig Europaischer Schmetterlinge 

 of Hubner {Geometra, pi. ^G.Jl 140.) represents G. Belgiaria, 

 which so much resembles the female oi B.favillacearhis^ except 

 in its pectinated antennae, that until this year an opinion was 

 entertained that we possessed both species : as however we 

 found the sexes upon the same ground, and out of a conside- 

 rable number of both, the males were all B.favillacearms and 

 the females B. Beegiarius, there can no longer be a doubt of 

 their being the sexes of the same species ; and if it were not 

 for the masculine antennae of Hubner's figure, I should be 

 disposed to consider it, as the female of his B.Javillacearius ; 

 it may possibly be a strong variety of the male partaking of 

 the colouring of the female, or the antennae may have been 

 erroneously figured : if it be otherwise, we do not at present 

 possess the species. 



Both sexes of B. favillacearius are found from the middle 

 of May to the middle of July resting upon the ground (with 

 the inferior wings completely concealed by the superior ones): 

 where turf has been pared off upon heaths, especially where it 

 is rather moist, it is easily detected, from the earth (a black 

 peat) being so opposite in colour ; and it is perhaps the most 

 easy of all insects to capture, as nothing apparently will induce 

 it to fly during the day : late in the evening we took specimens 

 of the male near Lyndhurst flying very sluggishly. 



The plant figured, Tm'mentilla et'ecta (common or officinal 

 Tormentil), was growing upon the heaths where the moths 

 were taken. 



