t aly ) 
bright in colour and large in size, the black borders of the 
females being very broad. Those that emerged the following 
spring were of the ordinary spring form, decidedly smaller 
in size, whilst the borders of the females were quite normal 
and the colour nothing unusual. He pointed out the fact 
that the two emergences came from one set of larvae reared 
to the pupa stage by Mr. Burrows; those that stayed over 
through the winter had no doubt used up to some extent their 
own tissue in their survival, hence the fact of their smaller 
size and quite spring-like form. From the biological point 
of view the exhibit was of much interest, not only in that the 
same set of larvae produced the two forms, but also in the 
matter of sexes, the autumn emergence resulting in ten females 
to six males, whilst the spring emergence produced ten males 
and seven females. 
INSECTS AND ASCLEPIADACEAE.—Dr. K. Jorpan showed 
a Swallow-tail (Papilio thoas thoantiades), a Hawk-moth 
(Protoparce diffissa diffissa) and a Honey-bee (Apis mellifica), 
which were found dead at Buenos Ayres on Arawjia albens, 
being caught by their proboscis in the flowers of that plant. 
This sweet-smelling climber, a native of Southern Brazil and 
the Argentine, but also cultivated as an ornamental shrub 
in other countries, is well known as an insect-catcher, moths 
being particularly often found entrapped. The exhibitor 
explained the peculiar mechanism characteristic of the flowers 
of all Asclepiadaceae, and which ensures cross-fertilisation 
be means of insects. 
SrriputaTinc Pupa.—Dr. K. Jorpan also exhibited, 
on behalf of Prof. Szrrz, the cocoon and chrysalis of a Noctuid 
from China. The pupa bears dorsally at the base of the last 
segment a patch of sharp longitudinal ridges, and there are 
corresponding ridges on the inside of the cocoon. This stridu- 
lating apparatus enables the pupa to produce a loud chirping 
continued sound, which Dr. Seitz at first mistook for that 
of an Orthopteron. Leaning on his arm against a tree, Dr. 
Seitz felt vibration under his hand, and found that the sound 
proceeded from a cocoon on which he had accidentally placed 
his hand. He collected several such cocoons and bred from 
them the Noctuid Gadhirta inexacta, Walk. 
