LARENTID.-E—LARENTIA. 187 



Not very variable ; .slightl_y so in the direction of slate- 

 colour, or, on the other hand, of yellow-brown or increase of 

 orange dusting ; occasional specimens are distinctly paler in 

 both ground colour and markings ; and in the few known 

 Irish specimens there is deficiency of the yellow dusting. 



On the wing from the end of June till the beginning of 

 Septeml.ier ; whether in one or two generations does not 

 seem to be definiteh* ascertained ; but when reared in con- 

 finement it emerges in May and will produce a second gene- 

 ration in August. 



Lakva stout, slightly tapering to each extremity ; sides 

 projecting : undersurface slightly flattened ; usual raised dots 

 emit each a stiff bristle; head small, rounded, not highly 

 polished, dull pinkish-lirown or dull green, dusted with 

 black ; body dull green, chocolate, or red-lirown — always of 

 a dull shade ; from the fourth to the eleventh segment is a 

 series of broad black V-shaped dorsal markings, bisected by 

 a darker dorsal thread, the anterior part of each filled up 

 with pink or lilac and forming a triangle, the apex yellow 

 and pointed forwards ; the oblique dashes are continued more 

 faintly on the sides to the spiracular region ; spiracular stripe 

 dull yellowish-ochreous or dull white, the edges ill-defined ; 

 undersurface unicolorous dull green ; usual raised dots black, 

 ringed with dull white, or with a paler tint of the ground 

 colour. 



It differs from that of X. ruMnht in being shorter, more 

 bristly, without the lateral lines and the whitish threads at 

 the divisions of the segments ; the edges of the spiracular 

 stripe Ijeing ill-defined ; the dorsal triangles being yellow at 

 the apex, not orange ; and the raised dots more prominent, 

 (('has. Fenn.) 



September till April; and the second generation (when 

 produced) in June and July; on t<(i.i:ifr(i<)ii aizoidis, ,S. hi/p- 

 riukha, S. pclrcca, S. oppodtifolia, and various other Saxifrages 

 and Sedums, especially preferring the flowers. 



