ON THE LIFE HISTORIES OF FOREST INSECTS 



33 



2. Life History of the buprestid Sphenoptera aterrima and the cerambycid 



Trinophyllum cribratuin. 



Green deodar-trees were felled under the orders of the Divisional 

 Officer, Mr. V. Munro, at the end of May 1908, and watched throughout 

 the year and up to June of the following year. The observations so made 

 and the specimens taken enabled the life histories of these two pests to 

 be definitely ascertained. It is now known that each takes a whole year 

 to pass through 

 one life - cycle 

 (cf. p. 205 and 

 p. 341), and that 

 the beetles ma- 

 ture and leave 



the trees at the 



\ I 



end of May or 

 in the first fort- 

 night of June, 

 and lay their 

 eggs in newly 

 felled fresh 

 sappy trees or in 

 standing green 

 sickly ones. 



The life his- | 

 tory of an Ich- 

 n e umo n fly, 

 E phi elites, which 

 parasitizes the 

 buprestid grub 

 has also been 

 worked out 

 through 1 1 1 t 

 year (see p. 207). 



The impor- 

 tance of thus in- 

 vestigating the 

 life histories of 

 all the principal 

 bark- and wood- 

 feeding pests of 

 the more impor- 

 tant trees cannot 

 u i Fir,. IQ. Egti and larval galleries "t Spha otrypes s 



be too strongly g^, ^.^ surf j> ,,, sil bark f sho wmg the "plan' of the 



insisted upon. galleries. 



9003 



