This moth is evidently nearly related to Penthophera (PI. 213), 

 and exhibits several remarkable peculiarities; the palpi may 

 be termed maxillary, since they appear to me to be attached 

 above the maxillae, which however are mere rudiments and 

 not contiguous; the internal spine of the anterior tibiae is 

 curved and regularly ciliated, and the hinder ones have but 

 one pair of spurs at the apex. The antennae are most beau- 

 tifully pectinated and resemble two feathers, whence it has 

 been called *plumigera'; the wings are somewhat transpa- 

 rent, and the nervures of the superior pair are totally diffe- 

 rent to any that I have seen. 



Most of the specimens of this moth have been obtained by 

 searching for the caterpillars ; they feed upon the maple, the 

 great round-leaved sallow, and the birch, and are full grown 

 the end of May. Darent Wood seems to be the favourite lo- 

 cality of these larvae; but Mr. Jos. Standish has found them 

 at Birch Wood and Reddlesdown near Croydon; and he tells 

 me that the caterpillars are generally of a powdery green ; that 

 which I have copied from Hubner might probably be on the 

 point of descending into the earth, for his other figure repre- 

 sents one of a whitish green colour, with three yellowish stripes 

 down the back, and one along the side. 



The moth appears the end of October, and even as late as 

 November. 



A sprig of the Common Maple {Acer campestre) with the 

 seed-vessels accompanies the insects in the Plate. 



