124 THE ENTOMOLOGIST. 



As common as the last, and probably occurring with it in 

 most localities where S. revayana is found. My specimens came 

 from the New Forest and Hereford. 



ab. glaucana, Lampa. 

 S7jno7iymy.—Glcmca7ia,IjB:m-p£h, Tidskr. vi, p. 31 (1885) ; Aurivillius, 

 Nord. Fjar. p. 80, glaucanus (1890) ; Staudinger, Cat. Pal. Lep. i, p. 

 361 (1901) ; Hofmann, Schmett. Eur. ii, p. 124 (1908). 



Original description. — " ab. glaucana, Lampa, * Tidskr.,' vi, 

 p. 81 (1885) ; ryggens och framvingarnes grundfiirg blaaktigt 

 grahvit, med foga skarpa techniugar ; vid kostalkanten en stor, 

 niisten tresidig, morkgra eller brunaktig flack ; ryggen grahvit, 

 nagon gang i midten morkbrun." 



Trandation. — The ground-colour of the lower and front wings 

 is bluish-grey-white, with hardly any definite markings ; on the 

 costal margin is a large, nearly triangular dark grey or brown 

 spot ; the thorax is grey-white, sometimes dark brown in the 

 centre. 



This aberration was described from Swedish examples, and so 

 far as I am aware it has not occurred elsewhere than in Sweden. 

 I have not seen a specimen, but from the description I should 

 judge it to be very similar to ab. afzeliana, but without the dark 

 basal blotch, and with ground-colour of the superiors " bluish- 

 grey-white " instead of " greyish." 



ab. canesccns, n. ab. (PI. I, fig. 13.) 



Synonymy. — Eennie, Conspectus, p. 174 (1832), cleg ener anus \ 

 Wood, Ind. Ent. figs. 1040 and 104:1, deg ener emus (1839) ; Westwood, 

 Brit. Moths, ii, p. 151, pl. xci, fig. 7 (1845), figured and described as 

 degeneranus (1815). 



Description. — Superiors hoary greyish-white, with dark grey 

 cloudings and blotches, and three waved transverse fuscous lines. 

 The first of these lines represents the outer margin of what is in 

 most of the forms the dark basal blotch, the second and third 

 outline the central area. The base of the superiors, as far as the 

 inner margin of the central dark area, is hoary greyish-white 

 with dark grey blotches. The central area has a large triangular 

 dark-grey blotch on the costa stretching half-way across the wings. 

 Following this is another hoary greyish white transverse band 

 with darker grey blotches ; then several dark fuscous indistinct 

 blotches ; then another narrow light hoary grey band followed by 

 the dark grey hind margin. Along the base of the cilise is a row 

 of about seven black dashes. The cilise and posterior wings, 

 head, palpi, antennte, thorax and abdomen are dark grey. 



ab. lichenodes, n. ab. (PI. I, fig. 14 ) 



Synonymy.— Ste-phens, Haust. iv, p. 146, degeneranus (1834) ; 

 Barrett, Brit. Lep. vi, pi. cell, fig. 3, revayana (1900). 



