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The larvae usually be- 

 come full-grown towards the 

 latter part of the year, about 

 November, and may pupate 

 then ; or more rarely perhaps 

 they hibernate in their tun- 

 nels, and with the first 

 warmth of spring eat out the 

 pupal chamber in the heart- 

 wood and change into the 

 pupal form in it in the latter 

 part of April. In the first 

 and more usual case, as is 

 evidenced by the numerous 

 holes closed by the calcareous 

 covering seen in felled and 

 converted timber in the cold 

 and hot weather months, the 

 winter is passed through in 

 the immature beetle stage 

 within the pupating chamber, 

 the insect being fully formed, 

 but all its outer chitinous 

 parts still soft, as we saw in 

 the case of Plocadcrus obesus. 

 I have taken beetles in this 

 stage in January and Feb- 

 ruary. These form the early- 

 issuing beetles of the species, 

 and account for the appear- 

 ance of the beetle in June. 

 In the second case, the insect 

 spends a portion of May and 

 June, some six to eight weeks, 

 in the pupal stage, and issues 

 as a beetle some time in July. 

 Thus some four or five 

 months are spent by the grub 

 actively feeding in the tree. 

 It may then either pupate 

 (most often) at the com- 

 mencement of winter, or 

 hibernate, and pupate in the 

 spring. The larval period in 

 this case extends to about 



Fig. 210.— Sul huusc-post, snowing galleries and 

 pupal chambers of .-Eolcsthes holosericea, Fabr., in 

 the wood. Garhwal, January 1907. 



