66 



THE CLASS OF INSECTS. 



Fig. G4 shows what we may call the seraipupa, concealed b}' 

 the larval skin. There are eleven pairs of stigmata, three 

 thoracic and eight abdominal. The head of the semi-pupa 

 lies under the head (a) and prothoracic ring (h). The basal 

 ring of the abdomen (c), or foiu'th ring from the head, is un- 

 changed in form. This figure also Avill suffice to represent 



Fig. 65. 



Fis. 60. 



/ 



Fig. 67. 



the larva, though a little more produced anteriorly than in 

 its natural form. 



In another stage (Fig. 65) of the semi-pupa, the larval skin 

 is entirely sloughed off, the two pairs of wing-pads lying paral- 

 lel, and very equal in size, like the wings of Neuroptera. The 

 thoraco- abdominal ring, or jyrojyodeum (c), is distinguished b}^ 

 its oblong spiracle (n), essentially differing from those on 

 the abdomen. At this point the bod}^ contracts, but the head 



