HYPSIPYLA ROBUSTA, MOORE. 313 
Fe a 
The moth has a pearly lustre. It is brown in colour with 
faint black markings on the veins. Itis thus described in the 
Fauna of British India by Hampson :— 
Pale rufous-brown irrorated with black and grey. Fore 
wing with the costal half strongly suffused with grey; the 
veins all streaked with black: some olive-yellow on base of 
costa and median nervure, on extremity of median nervure 
and discocellulars; traces of a dark sinuous medial line, 
with a dark patch beyond it on inner margin, and of a very 
highly dentate oblique dark postmedial line bent outwards 
between veins 5 and 2. Hind wing semi-hyaline white ; the 
costal area suffused with fuscous; the base of cilia pale rufous. 
Pl. VIII, fig. 3, in /nfurdous Insects shows the larva, pupa, and 
moth of this insect. Exp, g 26-32, 2 28-42 millim, 
Life History. 
This insect, according to Mr. B. O. Coventry, passes through 
two generations in the year in the plains of the Punjab, and this 
number is not unlikely to be exceeded in the moister and 
warmer parts of the country, Its life history in the Punjab 
plains is here described. 
The eggs of neither generation have yet been obtained. 
The larve first appear at the beginning of April as soon as the 
tin trees come into flower. They feed upon the petals, young 
fruits and ovules of the tree, becoming full fed about the 
middle of May. Mr. Coventry states that these larve very 
rarely attack the shoots of the tree and only do so when 
there are no flowers or fruits upon it. My own observations 
made in the same plantation (Changa Manga) in April 1go1 
showed me that the caterpillars were to be found in the shoots 
in some numbers on trees on which the flowers and fruits were 
very seriously attacked. This may have been due to the fact 
that the grubs were exceedingly numerous during that year, 
The more forward of the larvae commence pupating about the 
beginning of May, and pupation takes place in two ways. Those 
insects that have been feeding upon the flowers and fruits 
march down on to the trunks of the trees and collect together in 
numbers beneath loose flakes of bark and pupate in this 
position, Thick felt-like masses of a silken material containing 
Y2 
