ON THE LEPIDOPTERA OF THE OUTER HEBRIDES. 221 



Larentia didymata. — The specimens are dwarf, and present 

 the grey coloration of the two species above mentioned, especially 

 in the female. 



L. ccBsiata. — Another species of the prevailing grey colour of 

 the Hebridean Geometrae ; but as grey is the normal colour the 

 diti'erentiation is not very marked. 



Emmelesia albidata. — None of the specimens resemble those 

 captured last year in the Shetlands, but the insect occurs in the 

 neighbourhood of Stornoway in two widel}' different forms ; first 

 there is the ordinary coloration, which is quite indistinguishable 

 from that of Scotch and English specimens. A pure white 

 variety has been taken in the jDroportion of about one to six of 

 the normal form. I have never before seen an albino of a 

 Geometer, except one that I possess myself of EiiboUa hiininctaria ; 

 but this, which I took at Lewes, Sussex, is a mere accidental 

 aberration. In the case of the purely white specimens of 

 E. albidata, as several were taken, it is clearly a well-defined 

 local variety, if it be not a species, for no intermediate varieties 

 were found. I propose, therefore, that this variety should receive 

 the subspecific name of Emmelesia albulata, variety Hebudium. 



Ypsipctes impluviata. — The specimens are of an almost uniform 

 grey colour, with the central light band found in the Southern 

 form obscured, another instance probably of an insect assimilated 

 in colour to its environment. 



Melanippe hastata. — Those taken are much smaller than 

 English specimens, are more strongly marked with black, and 

 in some the upper wings have the ground colour of a very pale 

 yellow. 



M. montanata.~T\iQ whole of the ground colour of those 

 captured is suffused with grey, and the specimens are far below 

 the usual size, but they do not resemble those from the Shetlands 

 in the breaking up of the central band into bandlets. 



Campitogramma bdineata. — Tiie si^ecimens do not quite 

 resemble those from Shetland, but differ in colour very much 

 from the normal form ; the primary wings, though not strictly 

 grey, have the appearance of being washed with that colour, and 

 contrast with the yellow of the secondaries ; moreover, in all 

 cases but one, the central band is broadly edged with black ; the 

 one aberrant variety is entirely clay-coloured, with the markings 

 unusually faint. 



