312 
HYPSIPYLA ROBUSTA, MOORE,} 
THE TOON-TWIG BORER. 
ie 
Plate XIX, fig. 3, a, 3, ¢. 
References :— Moore, Lep. Ceyl. iii, p. 365, pl. 184, figs. 4, 4a. (larva); Rag. 
Mon. Phyc. p. 1309, pl. vi, fig. 12; C. & S. no. 4598 ; Hypsipyla 
pagodella, Rag. Nouv. Gen. p. 10; C.& S. no. 4566 ; Hmpsn. 
Faun, Br. Ind. Moths, iv, 89, no. 4384; Magira robusta, Steb. 
Inj. Ins. Ind. For. 122, pl. viii, fig. 2. 
Classification :—Order, LEPIDOPTERA. Sub-Order, HETEROCERA. 
Family, Pyralide. 
Trees attacked :—Cedrela Toona, Roxb. (Tun) ; Swietenia Mahogani, 
Linn. (Mahogany). 
Description. 
The eggs of this insect do not appear to have been yet 
described in India. . 
The /arva, when young, is a reddish-yellow in colour, the 
segments being covered with minute black tubercles. When 
full grown, the colour changes to blue, the head being black and 
the segments of the body covered with black tubercles from 
which spring short stiff hairs. Length 1 inch. 
Hampson describes the larva as purplish grey with a few 
short hairs; somites spotted with black and with a lateral 
series of red spots ; head and dorsal patch on 2nd somite black. 
Pupa is enclosed in a dense closely-fitting elongate silken 
cocoon, these cocoons at times being found collected together 
bound up in a thick felted mass of white silk (see Pl. XIX, fig. 3 
a.) The pupa, when removed from the cocoon, is seen to be red 
in colour and # inch in length. ! 

1This insect is the one which is unfortunately commonly known in India 
under its old name of Magiria robusta, Moore. This name is no longer 
correct. 
The life history of the pest in the Changa Manga Plantation in the 
plains of the Punjab was worked out in 1898-99, by Mr. Coventry, a detailed 
‘ account being published inthe Judian Forester, Vol. XXV, No. 9 (1899). 
I have reproduced most of these excellent observations here, including some 
notes on a subsequent correspondence I had with the author on the subject. 
