NOTODONTIDM. i6i 



the birch trees in the daytime in its extremely restricted 

 locality, in the early spring, often before the snow is off the 

 ground, and so securing it soon after emergence. It sits 

 close in one of the open gashes with which all old birch trees 

 are so plentifully ornamented, and is much protected by its 

 great resemblance to the rough dark bark. If the weather is 

 very cold it will hide in the deepest crannies close to the 

 ground. 



So far as I know its only locality in these Islands is the 

 extensive range of birch woods around Loch Rannoch, Perth- 

 shire, but it is hard to understand why it should not be found 

 in all open woods of moderately old birches in the Highlands 

 of Scotland. The first British specimen seems to have been 

 taken by Mr. Cooper in the year 1854. The next year 

 another was found, and from that time to the present a good 

 number of specimens have been taken, mainly by professional 

 collectors, but by no means in regular numbers from year to 

 year. Abroad it is found in Northern France, Germany, 

 Galicia, Livonia, and the Ural Mountain district. 



Genus 10. PYGiERA. 



Antennae about one-half the length of the fore wings, 

 pectinated in the male to at least three-fourths of their 

 length, but not with solid teeth, only with, as in the 

 Sphingidge, horse-shoe shaped tufts of long curved bristles 

 which closely imitate the usual teeth ; thorax strongly 

 crested ; fore wings long and ample, with the hind margin 

 regularly toothed. 



We have only one species. 



1. P. bucephala. L. — Expanse 2 to 1\ inches. Fore 

 wings silvery grey-brown, with a very large round creamy 

 blotch toward the apex. 



Antennae of the male stout, pectinated, but only with 

 tufts of strong curved bristles, placed in horse-shoe form, 



L 



