372 PKOCEEDINGS OF THE THIRD ENTOMOLOGICAL MEETING 



does not harden very quickly and not until the shoot has grown to a great 

 height. On the 18th September 1918 the top of a new shoot about 

 fifteen feet high was observed to drop off. On examination, the top 

 was found to be full of maggots of this fruit-fly, which riddled the soft 

 stem, causing the internodes to break off. There were 178 maggots in 

 it out of which 146 attained the adult stage between 29th September 

 and 30th October, 82 being females and 64 males. The shoot itself 

 somewhat shrivelled and dried at the top and did not grow any further. 

 But it hardened and its branches, especially those towards the apical 

 part, grew thick and long. Such damaged bamboos are frequently met 

 with. 



The Lamiad Borer (C. S. 1814). 



Plate 31, figs 2,3; Plate 32. 



Foodplants — Batri and Rarhi (Sacchanmi spontaneum). 



This longicorn borer has only one generation in the year. The adults 

 emerge about June and deposit eggs. Young grubs have been collected 

 on the 20th June. The grubs are available in very large numbers in 

 Rarhi and Batri from June onwards. They are extensive borers and 

 voracious eaters and convert the stems into hollow tubes. They remain 

 active till about November and then rest inside the stems, pupating just 

 before emergence about June. 



The full-grown grub measures about 24mm. in length, about 3 mm. 

 across the abdominal region and about 3'5 mm. across the thorax. The 

 head is small compared with the thorax which is swollen and protuberant 

 ventrally. On the back of the sixth and seventh abdominal segments 

 there are some small tubercles arranged across the segments in double 

 rows. The hind end is truncated. The body has small brown haira 

 all over. There are no legs of any kind. The colour is yellow. The 

 young grubs resemble the older ones in appearance and colour. 



The Weevil Borer (C. S. 1778). (Plate 33, fig. 1.) 

 Foodplant — Rarhi (Saccharum spontatieiwi rarhi). 

 The external symptom of attack is the " dead heart."' The grubs are 

 found in large numbers in March- April and although their size is small 

 they are very vigorous borers and bore up and down the stem exten- 

 sively. 



The full-grown grub is about 5-5 mm. long and about 1-5 mm. across 

 the middle of the body which tapers towards each extremity. The 

 head is pale-yellow, glossy, and the body is also of the same colour 



