570 MygHarold Powell on the 
The larvae which have been kept in tubes have the 
ground colour much darker. They are coffee-coloured, in 
fact. 
From July 8 to October 17 I was away from Hyeres, 
travelling about most of the time in the Pyrénées Orien- 
tales. I had four larvae with me. Two of them, which I 
had kept in tubes from the Ist stage, fed slowly all 
through the summer, reaching, I think, the last stage or, 
at any rate, the one preceding it. They died in September 
from a fungoid disease which declared itself as a small 
black scar on the back of one of the abdominal segments. 
The scars did not appear to interfere much with the larvae 
at first, but after a week or ten days they fed much less, 
and finally ceased feeding altogether, though they remained 
plump. The one first attacked I found dead and stiff in 
the tube one day, quite a month from the time the disease 
first appeared. The other, in which the disease was 
already advanced, died soon after in the same way. The 
scars had enlarged considerably during the course of the 
disease. They looked like charred cork on the skin. Two 
other larvae which I put in tubes towards the end of July, 
and which had then not fed for fully six weeks, started to 
eat a Potentil/a, which is common generally in ditches and 
along roadsides. The moister atmosphere of the tube and 
the presence of fresh food made them active. Before this 
they had been spun up in dried leaves. 
In mid-September, fearimg that they might share the 
fate of the other two, I put them on a potted plant of 
Potentilla, covered the plant with muslin and left them 
out of doors. They spun up between the leaves at once, 
and for a fortnight I saw signs of feeding on those leaves 
forming the sides of the nests. The smaller of these larvae 
dried up in its nest, and I found it dead before leaving 
Vernet. I brought the other back to Hyéres on October 17 
and put it on a growing plant of Potentilla hirta which I 
dug up at the edge of one of the quarries behind the Villa 
les Rossignols near Costebelle. The country was very dry 
at that time, only a little rain having fallen in September. 
However, I found the plant and others with plenty of 
green leaves around the bases of the dead flower stalks. 
The larva, which was then in the 4th stage, spun up 
between two leaves without delay, and for a time it fed on 
them. 
But after the beginning of November I saw no trace of 
