8 



CHBYSOMELIIUE. 



it is convex dorsally, sloping down gradually in front and more 

 abruptly behind. It consists of the head, three thoracic and nine 

 easily visible abdominal segments, the small anal sucker repre- 

 senting a tenth segment. Each of the hrsteight abdominal segments 

 bears a pair of spiracles, one lying on each side, in a dark- 

 pigmented spot ; there is only one pair of thoracic spiracles, 

 which are situated one on each side, almost ventrally and 

 anteriorly on the mesothorax • therefore there are altogether 

 nine pairs of spiracles. The larva possesses nine pairs of 

 odoriferous orifices, which are arranged in a series along each 

 side as follows : the first pair is on the mesothorax and the next 



Fig. 7. — Chri/somelapopuli, L., larva: — a, dorsal view (s., spiracles; 

 o.g., openings of odoriferous glands) ; b, front leg; c, spiracle. 



on the metathorax ; these are similar to each other in size and 

 larger than those of the abdominal segments, and are situated 

 in a line with the abdominal spiracles ; the first seven segments 

 of the abdomen bear the remaining seven pairs of these orifices ; 

 each abdominal orifice is situated dorso-laterally slightly posterior 

 to the spiracle of the same segment, compared with which it is 

 much larger and more prominent; the eighth segment of the 

 abdomen has a pair of spiracles but no odoriferous orifices. 

 Viewed dorsally each of these orifices is conical, the body of the 



