CEOMETRI DJE. GEOMETIIA. 163| 



tennse differently pectinated, and also in the form and dentation 

 of its wings, the posterior of which are not angnlated ; it also reposes 

 with them deflexed: — the larva is likewise of different form. 



Sp. 1. bidentata. A/is anticis fusco-cinerascentibus, atomosis, strigis duabus 

 undulatis annuloque interjecto fuscis. (Exp. alar. 2 unc. 2 unc. 2 lin.) 



Ph. Ge. bidentata. Linne.—N. G. bidentata. Steph. Catal. part ii. p. 6459. 



Harris, A. pi. 10. J", s — z. 



Ashy or reddish-brown : anterior wings the same, very finely dotted with fus- 

 cescent, with an undulated brownish stigma towards the base, and another 

 behind the middle, more or less approximating on the inner margin, and 

 between them, towards the costa, an oblong fuscous ring, enclosing a whitish 

 spot : posterior wings rather paler, with an ocellated spot on the disc as in the 

 anterior, and behind it an undulated fuscous striga. 



Variable in tint, some specimens being much darker than others, without refer- 

 ence to sex, as I have light and dark examples of both: the female, however, 

 has the hinder margin of the wings more strongly dentate, exclusively of the 

 difference in the antennce : — the relative position of the strigae, on the anterior 

 wings, to each other, varies much in different examples. 



Caterpillar variable, griseous marbled with brown, or green, or grayish-red; 

 sometunes nearly green, with irregular black or white spots : — it feeds on 

 various trees, such as the rose, wUlow, fir, alder, &c. ; — the pupa is thick, 

 smooth, and chesnut-brown ; and changes to the perfect state either in April 

 or June, the insect being double-brooded. 



Not very uncommon in woods and copses near London. " Heb- 

 den-bridge." — Mr. Gibson. " Epping." — Mr. Doubleday. " Mel- 

 don-park, Newcastle, &C.'''' — G. Wailes, Esq. 



Genus CLXXV. — Gegmetra, Leach. 



Palpi rather long, approximating, porrected and a little inclined downwards, 

 very pilose, the apex exposed and squamous, triarticulate, the basal joint 

 stout, longer than the second, which is cylindric, a little attenuated towards 

 the apex, terminal minute, subglobose : maxillw slender, short, scarcely 

 exceeding the palpi in length. Antenncs of the males bipectinated to the apex, 

 the radii ciliated and incurved ; of the females slightly serrated on both sides : 

 head small 5 eyes rather prominent : thorax robust, very woolly : abdomen 

 moderately stout, robust and obtuse in the females : wings flavescent, angu- 

 lated, and indented on the hinder margin ; during repose elevated, especially 

 in the second section. Larvae more or less elongated, resembling twigs, the 

 body having various tubercular excrescences : head depressed, slightly emar- 

 ginate anteriorly : pupa elongate, generally in a foUiculus among leaves. 



