88 



'This species differs from the others by its large size and simple antennae. 

 It will undoubtedly be found in the mountainous and boreal regions of North 

 America, as it seems to be common in Newfoundland and also in Labrador, 

 and can scarcely lie regarded as an imported species. My examples do not 

 differ materially from European ones. Its range in Europe is set down by 

 Staudinger as follows : Northern and Central Europe ; Piedmont ; Ural Mount- 

 ains; ! Armenia; Amur; Lapland. 



To the synonyms given above may be added the following from Guene"e, 

 which I have been unable to verity : nut'ilnhi Fabr. 226, autumnata 132, 

 impluviata 131, quadrifasciata 133, affiniata 134, carpinata 135? Bork., 

 inscriptata Donov., Jimbriata Haw., neglectata Steph. It is ealled in Europe 

 1 he November moth. 



Larva. — "The head of the caterpillar is rather narrower than the body, 

 and not notched on the crown; the body is stout, velvety, and cylindrical; 

 the colour of the head is dull-green, the mouth tinged with purple; the body- 

 is apple-green above, but liable to great variation, purple markings sometimes 

 appearing on all the segments; the back of the second segment, and a median 

 line on the tenth, eleventh, and twelfth segments, are often of this colour, and 

 the thirteenth segment 'is generally tinged with purple; there is, moreover, a 

 white stripe just below the spiracles; the body is glaucous or blue-green ; 

 the legs are pale transparent-green, the claspers of nearly the same colour, 

 but often tinged or blotched with purple. It feeds on white-thorn, black- 

 thorn, horn-beam, sloe, oak, and almost every forest tree, and is full-fed in 

 June." — Newman's British Moths, 109. 



THERA Stephens. Plate 1, fig. 5. 



Dysstroma Hiibn. (in part), Verz., 331!, 1818. 



Pelurga Hiibn. (in part), Verz., 335, 1818. 



Chesias Treits. (in part), Schm. Ear., vi (i), 330, 1827. 



Dnp (in part), Lep. Franco, viii (v), 497, 1830. 

 Thera Steph., 111., iii, -271, 183*1. 

 Cidaria Boisd. (in part), Gen. et Index, 213, 1840. 

 Chrsi<ix Boisd, (in part), Gen. et Index, 213, 1840. 

 Melanthia Boisd. (in part), Gen. et Index, 217, 1840. 

 Zarentia H.-Sch. (in part), Scbm. Eur., iii, 141, 1847. 

 Thera Steph., Cat. Br. Lep., 196, 1850. 



i. ii. mi., l'lial., ii, :!7ii, 1857. 



Walk., List Lep. Br. Jlus., xxiv, 1260, 1862. 



£ ■ — Head rather fuller and wider in front than in Petrophora. Antennae 

 and palpi as in Petrophora, the latter being long and pointed, rather bushy, 



