TRIFIDJZ. 245 



giving a proper shape to the cavity. The thin silk opercu- 

 him, coated with chips, which forms the outlet of the cocoon, 

 often shows no indication of the exit of the moth — the sides 

 of the opening, which is an irregular slit, falling together 

 again. (Dr. Chapman.) 



In this state through the winter. 



The moth is found occasionally, in its very restricted 

 localities, sitting in the daytime on the trunk of a hawthorn, 

 or an oak, clinging very closely to the bark and resembling 

 a knob of bark or a small patch of lichen. It flies at dusk, 

 and its flight is said to be low, undulating, and even slow. 

 It comes readily to sugar, but prefers a sheltered situation. 



It is one of our most local species, almost confined to the 

 Cambridge district — Fulbourn, Whittlesford, Waterbeach, 

 Isleham, Wicken, Chatteris, Newmarket ; and Monkswood, 

 Hunts. There is a record of the capture of two specimens at 

 Castle Morton, Worcestershire, and the Rev. T. H. Marsh 

 informs me of his capture of a specimen in North Norfolk. 

 Moreover, the late Mr. J. F. Stephens, writing about the year 

 1829, stated: "Mr. Haworth possesses a single specimen of 

 this insect, which I believe was captured in Norfolk." Nearly 

 all the recent specimens have been obtained in the Cambridge 

 district, to which its range in these Islands is probably now 

 almost limited. Abroad it inhabits Central Europe, Southern 

 France, Southern Russia, and some portion of Siberia. 



6. A. tridens, 8cliiff. — Expanse H to If inch. Fore 

 wings of a warm grey, with a deep black streak at the base 

 and on the costa, and a black dagger-mark at the anal angle; 

 second line curved obliquely inward toward the costa. 



Antennae of the male rather stout, notched near the base, 

 finely ciliated, dark brown, with the back of the shaft ashy- 

 white ; palpi and head tufted, greyish-white ; thorax greyish, 

 rather square, with a slight ridge in the middle of the collar; 

 shoulder lappets rather upraised, edged outwardly with 

 black ; at the back is a small crest of two points, each usually 



