FAMILY SCOLYTIDAE 541 



The larvae bore away from the central chamber either up or down the 

 stem, then- galleries being blocked up with wood-dust and excreta. When 

 fnll-fed they hollow out at the end of the gallery a longish chamber in the 

 sapwood and pupate in it (fig. c). 



I have taken mature beetles ovipositing in deodar-trees in the first week 

 of June (1902), and this may be the first generation of the year. 



At the beginning of November 1906 I took another generation of these 

 beetles tunnelling into branches to oviposit. It is therefore probable 

 that the insect passes through the winter in the larval or immature- 

 beetle stage. 



I am unable to say whether the insect passes through a complete life- 

 cycle between July and the end of October. It is possible that the June eggs 

 give rise to a generation of beetles issuing in the latter part of July or^'in 

 August, and that these beetles lay the eggs which produce the October 

 generation of beetles. 



Since the insect only feeds in green cambium and its method of ovi- 



position often results in the branches being girdled, it is 



Damage Committed capable of proving a serious pest to young trees ; the 



in tlie Forest. more so that whenever I have met 'it it has been in 



considerable abundance, the beetle apparently being a 



particularly hardy one. 



The curious fact that it is almost invariably found infesting the upper 

 part of branches already girdled by the Scolytns deodar girdler is of im- 

 portance, since It is necessary to discriminate between this insect in this 

 position and the real perpetrator of the damage, the Scolytus beetle. The 

 fact that It chooses this position also minimizes to some extent the 

 damage it does in the forest. 



When the insect is found infesting young growth the only safe plan 



of combating it is to wait till it is in the nearly full- 



Protection and grown larval stage in the trees, and then to cut out 



Remedial Measures, these latter and burn them. Infested trees can be 



easily recognized by the fact that the needles turn 



yellow and drop off, and rings of resin are to be seen beneath and encirclin- 



the minute shot-holes made by the beetle entering the trees. 



Ichneumon sp.— A small black fiy with membranous win-s • the 

 antennae eleven-jomted, bent, the upper part with a white pubescence'. 



A specimen of this parasite was taken from a pupal chamber of the 



larvae of this Cryhhalus in a deodar twig. The scolytid 



Parasitic Insect. grub had evidently lived to reach full size and eat out 



Its pupal chamber and had then died ; the Ichneumon 



grub, which had parasitized it, then pupating in the scolytid pupal 



chamber. 



