324 FAMILY CERAMBYCIDAE 



the night of 14-15 May and the igth of the month, or 6,000 eggs on 

 a 55-ft. bole. 



\ umber of Beetles Laying in Trees. -Eggs were laid subsequently to this 

 date. From this tree, which was felled on the I4th, 54 beetles were taken 

 on the I5th and 40 beetles on the igth. 



Mr. Rama Nath Mukerjee kindly carried on these observations until 

 17 July, and submitted the following interesting note : 



PERIOD AT WHICH BEETLES BEGIN TO DISAPPEAR FROM FOREST. 



Result of inspection of sal-trees felled for the purpose of determining at what periods of 

 the year the longicorn beetles are to be found on the wing. 



Sal-tree No. 3. Green, blown down by storm on 29 May 1906. Girth, 5 ft. 4 in. Length, 

 50 ft. Forked at a height of 21 ft. ; stem full of knots, all the roots (except few small side ones) 

 were found to have been attacked by fungi. There was no other external sign of disease. 



{at 7 A.M. = 207 

 ,, 10 A.M. = 189 

 ^^^ 4 P.M. 2IO 



31 ,, ,, Beetles found 19 



i June 7 



3 The eggs collected on 30 May 1906 were 



found to have hatched in the tube. 



4 ,, Beetles found 15 



Total beetles found on tree No. 3 .... 647 



Sal-tree No. 4. Green, felled 8 June 1906. Girth, 4 ft. 3 in. Length, 61 ft. 



9 June 1906. Beetles found 228 



10 11 11 11 11 -4 



13 ii 11 ,,........ 9 



Total . . 261 



Sal-tree No. 5. Green, felled 20 June 1906. Girth, 4 ft. 5 in. Length, 61 ft. 



21 June 1906. Beetles found 128 



22 ,, ,, ,,,,.... ... 47 



23 ,, ,, ,, ,,........ 21 



25 ,> 11 20 



26 ,, . 9 



9 J ul y i i, i, .... . . 8 



Total . . 233 



Sal-tree No. 6. Green, felled 8 July 1906. Girth, 4 ft. 3 in. Length, 72ft. 

 9 July 1906. No beetles were found. 



IO )' 11 5) 11 11 11 



"^ " 11 11 11 



17 ,, Beetles found 4 



In November 1905 Ranger Rakhal Das Chakravarti reported that he 

 had discovered longicorn grubs tunnelling into living sal-trees, "trees of 

 5 ft. in girth having completely succumbed on account of their attack." 

 These grubs were collected on 6 November. A fortnight later the ranger 



