GEOMETRID^.— PERICALLIA. 171 



Wings above from the base to behind the middle reddish-brown^ varied with 

 cinereous, with a white lunula in the centre of the disc of the posterior and 

 towards the costa of the anterior ; near the base is an obscure incurved darker 

 striga ; the hinder portion is purplish-white, with a bright red-brown lunular 

 mark at the apex ; the hinder margin rather dusky, angulated and obsoletely 

 denticulated : posterior slightly denticulated, the same as the anterior behind 

 the middle, with a brown spot: beneath somewhat similar markings, but 

 elegantly varied with luteous and purplish shades. 



Caterpillar brown or reddish, with whitish stripes on the sides, and brownish 

 spots ; it feeds on oak, &c. : the imago appears in June. 



Rare : found in the vicinity of Birch-wood, and in other places 

 within the metropolitan district: also, I believe, in the New 

 Forest. 



Genus CLXXVI. — Pericallia * mihi. 



Palpi rather short, parallel, acute, the base pilose, the apex scaly, triarticulate, 

 the two basal joints somewhat robust, the second longest, terminal minute, 

 subglobose : maxillae rather short. Anienna; bipectinated to the apex in both 

 sexes, the pectinations shortest in the females : head small : thorax moderately 

 stout, pilose: abdomen slender, with a tuft at the apex, in the males; some- 

 what robust, carinated, and obtuse in the females : wings deflexed during 

 repose ; anterior retuse, emarginate, the costa a little flexuous ; posterior 

 rounded, irregularly emarginated : legs short ; tibia; stout, subclavate. Larva 

 with 10 legs, attenuated in front, with two tubercles on the fourth segment, 

 and two recurved hooks on the eighth ; head small, slightly notched : pupa 

 short and stout ; changes amongst leaves. 



The genus Pericallia is notably distinguished from Geometra by 

 the antennae being pectinated in both sexes, by the wings being of 

 dissimilar form, the palpi and legs shorter, and by the great dis- 

 parity in the markings on the wings, which are of divers colours, 

 with the posterior rounded, irregularly dentate, and the anterior 

 retuse and slightly dentate : — the species affect gardens in prefer- 

 ence to woods, and fly during the afternoon, rather sluggishly. 



Sp. 1. Syringaria. Alis omnibus griseo-Jlavescentibus, rubro-micantihus, strigis 



repandis fuscis albisque. (Exp. alar. 1 unc. 6 — 8 hn.) 

 Ph. Ge. Syringaria. Linne.—Don. vl pi. 181.— Pe. Syringaria. Steph. Catal. 



part ii.p. 120. No. 6475. 



Anterior wings varied with luteous and griseous and tinted with purple, the 

 costa with some purplish- white dashes ; a little before the middle is a some- 



* iisg/xaXX'/is, perpulcher. 



n2 



