574 



FAMILY SCOLYTIDAE 



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

 bast 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 

 3rd 

 4th 



4th week in June. 



3rd week in August. 



1st 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 : — 



1st generation 

 2nd ,, 

 3rd 

 4th 



1st week in June. 



1st 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 Scolytns major, finally killing it. 



F/y. — Small, black, with long brownish 



yellow legs and two pairs of veined iridescent ^nf*vg, 



wings. Body thin, with 



the apical segments 



curved downward-^. 



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



Larva.- -A small white grub pointed at 



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



ably not full-grown). ^^f^ FiG. 360. — Bracon sp., para- 



C^^^^;/.-Ovate, elongate ; greyish brown, X 4 ^'^% °" f^^jy^'^^ major Steh. 



., r r 1 ,-, • ^» Cicolytus larva with Ichneu- 



the surface of a parchment - like consistency ^^ ,„„„ ,^,^,, feeding paiasitically 



covered with small, fine, ligneous fibres. Length, on it '; b, cocoon. North-West 



6 mm. Himalaya. (After E. P. S.) 



Parasitic and 

 Predaceous Insects. 



