458 BRITISH LEPIDOPTERA. 



from their attachment to the o]d skin, and leaving them to clog 

 the breathing apparatus (Bacot). 



Cocoon. — Two of the larvae formed rather large and firm oval 

 cells in which to pupate, but no silk appeared to have been used 

 in their construction ; they were from two-and-a-half to three-and-a- 

 half inches below the surface. Of the remainder I cannot speak 

 with certainty, their cells, if any, must have been extremely fragile 

 (Bacot). 



Pupa. — Very close indeed to the pupa of Amorpha populi ' ; they are 

 a little smaller, and are more delicate in texture. They tend to 

 great exaggeration of the scars of the prolegs and of the caudal 

 horn. As weak specimens of other Amorphids tend to do this, this 

 is rather an evidence of weak constitution than of definite variation. 

 The subsegmentation, as described in the pupa of A. populi, is 

 very distinct; on abdominal segment 3 five subsegments are marked 

 out; the neuration and Poulton's line are better marked than in 

 the pupa of A. populi, again apparently owing to the thinness of 

 the chitin not allowing wrinkling, etc., to obscure the more essential 

 markings ; the pattern of wrinkling or surface sculpturing is quite 

 the same as in A. populi; the anal spike is not quite as smooth 

 as in the pupa of A. populi, but very nearly so. The thinness 

 of the chitin is again evidenced by the shrivelling of one or two 

 dead specimens, as never occurs in either A. populi or ,5". ocellata. 

 In one ? pupa, abdominal segments 8, 9 and 10 are almost as 

 distinct and separate as in the $ pupa, but the anterior pore is 

 at posterior margin of 8, and has, on right side, a rounded boss 

 as in $ , which is wanting on left side ; a median suture proceeds 

 from this to front margin of segments. Another ? pupa is nearly 

 like the pupa of a normal A. populi as to markings, but the three 

 segments are continued across nearly as in $ , the invasion of 

 8 by angle of abdominal segment 9 not occurring ; in another 

 the pore is almost in abdominal segment 9. The pupae of the 

 $ s might be those of normal A. populi (Chapman. Pupae received 

 from Mr. A. Bacot). The pupae vary to a slight extent both in 

 colour and shape. They are, as a rule, nearer in shape to the 

 pupa of S. ocellata, being longer and not so dumpy as that of A. 

 populi, with a tendency to narrow towards the head. On the 

 ventral area the scars of the prolegs and the anal claspers do 

 not show up so plainly as is usually the case with A. populi; the 

 final segments are, however, not nearly so rounded off as they are 

 in S. ocellata; the dorsal aspect of the anal segments and cremaster 

 are much more distinctly like those of the pupae of A. populi. The 

 surface is much smoother than that of A. populi, but without the 

 polished finish of S. ocellata. As regards colour, four were dead 

 black, two of these having a slightly greyish tinge on the wing- 

 cases, the remaining two being of a deep reddish-brown with a 

 slightly smoother surface. The sexual organs are quite as plainly 

 marked in pupae of the hybrid as in those of the parent species ; 

 the reddish pupae were female, and the four black ones male 

 (Bacot). The hybrid pupae had in part the deep black colour of 

 populi, in part a lighter tone of colour, reminding one of ocellata. The 

 pupae were never found so smooth as those of ocellata, yet also not 

 so rough as those of populi. The wing-cases remind one much of 

 ocellata in their narrow and waved form (Frings). 



