P YRA US TID^— ODONTIA . 163 



hind wings dull white, with faint brown streaks. Legs 

 whitish brown. 



Variable in the colour of the markings of the fore wings 

 from pale ochreous to dark yellow-brown ; also in the degree 

 of dark clouding of the hind wings, which in a specimen in 

 the collection of Mr. G. T. Porritt are almost black. 



On the wing in July and August, but occasionally from 

 the end of June till October, apparently in but a single 

 generation. On the Continent it is said to have two genera- 

 tions in the year. 



Larva. Head small, naiTower than the second segment, 

 porrected, obscurely triangular, and has a very flat face ; 

 body obese, somewhat shuttle-shaped ; the skin transversely 

 folded on the segments ; on the second segment is a broad 

 dorsal plate, very rough, and divided by a slender median 

 longitudinal line ; on each side of the same segment are also 

 two scabrous spots ; another rough place is on the thirteenth 

 segment ; legs short and horny ; ventral jDrolegs short and 

 moderately distinct ; anal prolegs close together and very 

 small ; head and plates black ; body pale yellowish white ; 

 raised dots black, placed in longitudinal series, and each 

 bearing a small bristle. (E. Newman.) 



May and the early part of June — but probably emerging 

 from the egg in the autumn and hybernating while small — 

 on Viper's bugloss (Echiuin vulgarc) feeding on the lower 

 portion of the stem and the leaf stalks and substance of the 

 largest basal leaves, causing the latter to wither and become 

 curled up. 



Pupa thin-skinned, a little flattened ; wing covers long, 

 dull from minute frosting ; dorsal and abdominal regions 

 smooth and moderately shining ; anal segment rounded and 

 without visible cremaster; general colour light bright brown. 

 In a hard firm cocoon of silk and vegetable material in one of 

 the withered basal leaves of the food plant ; the cocoon so 



