A. W. Rymer Roberts 195 



In the antenna the 3rd or supplementary segment is proportionally- 

 longer than the same segment in full-fed larvae, being two-thirds the 

 length of the 1st and 2nd segments combined. 



The mandibles are broader in proportion to their length than those 

 of the full-fed larva, the width at the base being rather more than two- 

 thirds of their length. The apex is finely pointed and considerably in- 

 curved. The eye spot is pitchy, situated somewhat further from the base 

 of the antenna than in the full-fed larva and is more conspicuous. 



The nervous ganglia, which are plainly visible through the integu- 

 ment in stained preparations, are in proportion to its size very large in 

 the young larva. The two lobesof the supra-oesophagealgangHon, situated 

 in the prothorax and extending backwards into the mesothorax are 

 especially noticeable. There are thirteen ganglia in all, as is common in 

 coleopterous larvae. The spiracle itself is rather more rounded in the 

 young larva, the breadth across the two orifices being greater in pro- 

 portion to the length than in older larvae. The teeth on either side of 

 the stigmatic orifices are few in number, being about seven or eight in 

 the thoracic and six in the abdominal spiracles. 



At first the peritreme is almost colourless, but later it becomes yellow, 

 though it is less strongly chitinised than in older larv^ae. Each orifice is 

 bordered separately by its own peritreme, so that the two orifices have 

 the appearance of separate spiracles with a small interval between them. 

 At the anterior end of each the peritreme disappears and the boundary 

 to the orifice is merely the unthickened cuticle. 



The hairs situated on the tergites between the mesothoracic and 

 8th abdominal segments are pale, the posterior row slightly longer than 

 the length of the segments to which they belong, the anterior short. 

 In the prothorax, however, where the segment itself is longer than the 

 other segments, the hairs in both rows are cont iderably shorter than the 

 segments and are about equal to one another. On the 9th segment the 

 hairs surrounding the apex are noticeably long and the posterior hairs 

 of the head are also long, being longer than the anterior hairs and as 

 long as those on any other part of the body. 



Second Instar. 



As already stated (Pt. I, p. 126) the first ecdysis takes place in June. 

 The larva is then of about 3-5 mm. in length. In the second instar its 

 growth is much more rapid and at the end it has attained a length of 

 5'5-6-5 mm. and breadth of about -5 mm. The colour of the larva is now 

 pale yellow and the body is quite opaque. The tergites are nearly smooth, 



