CONTRIBUTIONS TO HISTORY OF THE BRITISH PTEROPHORI. 279 



certainlj' with larvse, of the- second brood. For this reason it 



would perhaps be more correct to say that there are a succession 



of broods between June and October. From my own observation 



I am inclined to think that there are but two broods, and that the 



periods may be approximately fixed as follows : — First brood, 



larva, June and July ; imago, July and August. Second brood, 



larva, August and September ; imago, September and October. 



Lord Walsingham, in his ' Pterophoridae of California and 



Oregon,' writing of Pteropkorus monodactylus (p. 40), says : — 



" One distinguishing peculiarity of this genus and species, 



whether in Europe or in America, by which it may always be 



immediately recognised, is the presence of brush-like tufts of 



appressed scales on the upper side of the hind feet. In good 



specimens these are noticeable on each of the tarsal joints below 



the second pair of spurs; it is remarkably constant, and 



does not occur, so far as I am aware, in any other genus of the 



Pterophoridse." 



Platyptilia, Hb. 



bertrami, Eoessler. 

 Imago. — Expanse, 12-14 lines. Fore wing whitish ochreous, more 

 or less suffused with a pale shade of raw sienna, and clouded with a darker 

 shade of the same colour. The costa narrowly dotted with dark brown 

 scales : beyond the middle these scales become more numerous, and form a 

 distinct dark brown costal edging to the outer digit ; this edging is 

 interrupted just over the digital juncture by the whitish ochreous ground 

 colour, which shows up in the costa at this point. Just below the digital 

 juncture are some dark brown scales ; in some examples these scales are 

 so compacted as to form a distinct dot. Fringes, a paler shade of ground 

 colour, with a patch of brownish scales at the angle of inner digit, and a 

 smaller patch about the middle of the inner margin also brownish. Tip of 

 outer digit, in some specimens produced and hooked, in others it is not 

 produced and hardly pointed ; tip of inner digit obtuse. Hind wing, first 

 and second feathers brown, with a faint purple gloss ; fringes paler. Shaft 

 of third feather pale brown ; fringe grayish brown, whitish ochreous at the 

 base, with a small, apparently round, patch of dark brown scales in the 

 middle of inner margin.* Head, thorax, and abdominal juncture whitish 

 ochreous, more or less suffused with raw sienna. Hind legs whitish, with 

 three brown bands ; one large and one small one on the tibise, and a small 

 one on the tarsi. The tarsal markings are only seen in fresh specimens. 

 July. 



* This patch alsw occurs in dichrodactylus, but reference to it was omitted in my 

 debciipliun of that insect (Ent >m. xv. iiU). — R. S. 



