A CI DA L rm. E—A CI DA LI A . 6 r 



and second lines of the fore wings, and the three lines of the 

 hind, more distinct. Body shorter and thicker. 



Undersides of all the wings smoky-white, the fore wings 

 much clouded with smoky-grey and the hind wings dusted 

 with the same ; in the male there are obscure indications of 

 the lines of the upper side ; in the female these are dark 

 and strongly marked. Body and legs whitish-grey. 



Only a little variable in the distinctness of the transverse 

 lines, the degree of dark dusting, and the presence or absence 

 of the discal dot of the fore wings. 



On the wing in June and July. 



Larva. Head and body about equal in width ; head 

 broadly but very indistinctly notched on the crown ; bodj' 

 extremelv slender, notwithstanding the presence of a dilated 

 lateral skin-fold ; the twelfth segment is slightly elevated ; 

 the divisions of the segments are not clearly defined, but 

 each is transversely wrinkled and divided by the wrinkles 

 into fourteen or sixteen extremely narrow but distinct sec- 

 tions ; head wainscot-brown with longitudinal darker marks, 

 which are continuous with stripes upon the dorsal area of the 

 body ; body pale wainscot-brown ; dorsal stripe darker, in- 

 creasing in intensity at the divisions of the segments, and 

 still more at the anal extremity ; it is traversed throughout 

 by a thread-like paler line ; sulidorsal stripe rather paler, also 

 intersected by a still paler thread-like line ; the skinfold is 

 paler than the dorsal area, and below it is a darker stripe, 

 which becomes more intense toward the anal extremity, and 

 terminates in the ventral prolegs ; the ventral area is very 

 pale except between the two pairs of prolegs ; spii-acles 

 black, and there is a black dot below the second, third, and 

 fourth ; legs very pale ; prolegs darker, but having a pale 

 external area. It rests with the prolegs firmly attached to 

 the edge of a leaf, the body being kept perfectly rigid, and 

 held in a straight position at an angle of forty-five degrees, 

 the head being semi-prone, and the feet crowded together 



