HYPSIPYLA ROBUSTA, MOORE. 

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numerous pupz, enclosed in the silken cocoons, embedded 
in them are thus obtained (see PI. XIX, fig. 1, a). The larva gives 
out a silken thread as it moves about, and the inflorescences, 
fruits, and branches and bark of the trunk thus become covered 
with dense masses of silken threads in which excreta, partially- 
eaten petals and fruits become entangled. In a severe attack 
the larvee are to be found in swarms upon the bark of the trees 
during the first part of May searching for pupating places. Once 
they have pupated, however, they are no longer to be seen on 
the outside, and it is only by stripping off the flakes of bark that 
the pupze will become visible. Pl, XIX, fig. 3, a, shows a mass 
of these pupx on the underside of a piece of bark. The larve 
which tunnel into the stem change into the chrysalis state in 
the burrows they make in the terminal shoots. They also spin 
a silken cocoon before pupation. Fig. 3, 4, in the plate shows a 
hollowed-out twig with the packed excreta of the larva exposed 
at the top; 3, ¢,a cocoon 7 stfu in a hollowed-out branch. 
The pupal stage lasts about a week or ten days, the first 
moths appearing at the end of the first week in May and con- 
tinuing to be found on the wing throughout June and July. 
Mr. Coventry in his note considers that these moths are all those 
of the first generation, and they aretaken to besuch here. The 
following are suggestions for further observations on this 
point :— 
1. Is it not possible, since moths are to be found on the 
wing during some 12 weeks, that there may be more 
than one or even a series of generations of the 
insect overlapping one another between April and 
the end of July ? 
2. Or, do the moths from those larvz which tunnel into the 
shoots take longer to develop and issue than in the 
case of those coming from the larvze which feed 
upon the flowers and fruits? It is not at all im- 
probable that the caterpillars feeding upon the suc- 
culent terminal twigs take longer to mature than 
do their comrades on the fruits. 
It seems hardly probable that the insect should hurry 
through its pupal or resting stage (during which period it is 
