GEOMETRIDyE—lODIS. 287 



there are slender yellowish-green lateral lines ; lateral fold 

 raised into a conspicuous ridge ; spiracles yellow ; legs purple- 

 brown ; prolegs green ; there are two projecting points on the 

 anal segment. 



August till May or June, on Clematis vitalha (traveller's 

 joy), hybernating while very young on the stem of the plant, 

 being then of a brown colour exactly resembling its bark; 

 changing to green in the spring, as the leaves come out. If 

 touched or disturbed it falls from its food in a rigid condition, 

 which is maintained for some time. From the pairs of points 

 at each extremity, and the curiously whitened and shagreened 

 appearance of its skin, it bears an extraordinarily accurate 

 resemblance to the smaller twigs of its food-plant. 



Pupa rather slender, tapering gradually, not glossy ; head 

 and eye-covers a very little projecting; limb-covers closely 

 compacted ; those of the antenua3 broadly sculptured with 

 the forms of the pectinations; wing-covers very minutely 

 and closely covered with small wrinkles of incised sculpture ; 

 segments smooth, but very dull ; cremaster large and conical, 

 finished with several hooked bristles twisted together. Sus- 

 pended by the tail in a slight silken cocoon among leaves. 



The moth hides during the day in the thick masses of 

 clematis, or in hedges where this plant grows ; and flies at 

 dusk along hedges, and about thickets and other suitable 

 covers, especially in chalky districts, and may be attracted 

 by a strong light. Formerly to be found in the outskirts of 

 London, indeed, I have myself taken it at Dulwich, but it is 

 not now known to occur so near to the metropolis. Locally 

 common in most of the Southern Counties, though scarce in 

 Cornwall, and extending to Oxfordshire, Cambridgeshire, 

 Bucks, and Worcestershire ; even more frequent in Essex and 

 Suffolk, and found in Norfolk. The only record that I have 

 farther north is doubtful, at Orton in Cumberland. In North 

 Wales it is known to occur near Barmouth and at Colwyn 

 Bay. In Scotland it appears to be unknown ; and in Ireland 



