574 



FAMILY SCOLYTIDAE 



In choosing the trees only such as have a fair flow of sap in the 

 hast should be selected. To fell nearly dead trees for this pur- 

 pose will be useless, as the bast layer would rapidly dry and the 

 beetles will not oviposit in them. They will only lay in fresh sappy 

 cambium. 



To recapitulate : 



The periods to fell trap trees are as follows : 



ist generation .... 4th week in April. 



2nd ,, .... 4th week in June. 



3rd ,, .... 3rd week in August. 



4th ,. .... ist to 3rd week in October. 



The periods to fell and bark sickly trees containing full-grown grubs, 

 to bark fallen or trap trees, and expose the bark to the sun or burn it, are as 

 follows : 



ist generation 

 2nd 



4th 



ist week in June. 



ist week in August. 



4th week in September. 



2nd to 3rd week in November. 



It must be remembered that these periods will necessarily vary a little 

 with differences of elevation, aspect, and climatic conditions, the various 

 stages in each generation being more forward in a dry year than in a cold 

 wet one. Also a greater number of generations will be passed through at 

 the lowest elevations at which the deodar is found. 



To ascertain whether the time has arrived to bark sickly fallen 

 and trap trees, strip off a piece of bark and examine the larval gal- 

 leries to ascertain whether they have nearly reached their full length. 

 If they have, the time has arrived to bark the trees and burn the 

 bark. 



Bracon sp.--The grub of this fly feeds as an external parasite upon 

 the larva of Scolytus major, finally killing it. 



/-'(('.--Small, black, with long brownish 

 yellow legs and two pairs of veined iridescent 



wings. Body thin, with 

 the apical segments 

 curved downward-. 



Lntgth, 5 mm. ; wing spread, 8mm. (Fig. 361.) 

 -A small white grub pointed at 

 both ends, segmented. Length, 2.4 mm. (prob- 



FlG. 360. Bracon sp., para- 

 CY0.-Ovate, elongate; greyish brown, X 4 sitic e ? s ^lytus major, Steb. 



the surface of a parchment - like consistency , a > S W" S ^ Wlth lchne "- 



mon grub feeding paiasitically 



,v,th small, hne, hgneous fibres, Length, on lt ? ^ cocoon r North-West 



Himalaya. (After E. P. S.) 



Parasitic and 

 Predaceous Insects. 



