392 PROCEEDINGS OF THE THIRD ENTOMOLOGICAL MEETING 



Chilo sp. (C. S. 1831). 

 Plate 61 ; Plate 62, fig. 1. 



Foodplant — Rarhi and Batri {Saccharum spontaneum). 



The caterpillars were found in small numbers from July to September 

 b(jring in the stems of grown-up plants. 



The fullgrown larva is about 18 to 20 mm. long, with a glossy yellow- 

 brown head, a shiny yellow shield on the prothorax and a pair of broad 

 brick-reddish stripes on each side of a pale-yellow body. The dis- 

 tinguishing characters are given in the key of the larval forms of borers. 

 The larva pupates inside the stem. The pupa is brown. 



« 



Chilo sp. (C. S. 1835). 



Plate 62, fig. 2 ; Plate 63. 

 Foodplant — 



Ikri {Saccharum fuscum). 



The larvse fed on juar (Andropogon) stem in the Insectary. 



The caterpillars were found in small numbers and boring near the 

 top of the stems and causing " dead heart." A young caterpillar 

 collected on 12th March died on 10th May without pupatmg. Cater- 

 pillars collected on 5th July pupated and emerged before the 3rd Septem- 

 ber, the pupal stage occupying 12 days. 



The larva attains a length of about 21 mm. and is rather thick in 

 appearance, measuring about 3'25 mm. across the mesothorax from 

 which the body tapers shghtly both ways. The head is brown-yellow 

 and glossy. The prothorax is pale-yellow and rather glossy. The 

 other two thoracic and the abdominal segments have on the dorsal side 

 above the spiracles a purplish tinge on the pale-yellow skin, the purphsh 

 marking being deeper in the dorsolateral region and almost disappearing 

 on the dorsal region. The dorsal vessel is visible like a faint and some- 

 what interrupted stripe. 



The larva pupates inside the affected stem. The pupa is about 

 15 mm. long and yellow-brown in colour. 'The head has a thick short 

 protuberant ridge on the front. The primary tubercles on the body of 

 the larva develop into strong prominent spmes on the body of the pupa. 

 The spines are pointed, have a broad base and a hair arising from the 

 side below the tip. 



