126 THE LIFE-HISTORY OF CLERUS FORMICARIUS, LINN. 
glass tube temporarily, but when I came to look for it on 
August 25 I found only bore-dust in the tube; the larva had 
buried itself in the cork. 
The corked tube was then placed under a bell-jar to prevent 
escape of the C/erus larva should it bore right through the 
cork into the open; the tube was left undisturbed until - 
October 12th. 
On the cork being removed from the tube on October 12, 
the larva could not be seen, as its entrance-hole was plugged 
up with bore-meal. The cork was carefully cut in two and 
the larva found lying in the hollowed-out centre. The two 
parts of the cork were carefully fitted together again without 
disturbing the larva, and the cork then returned as the 
stopper of the glass tube. 
At various dates up till April 14th, 1899, I looked in, and 
the Clerus still remained in the larval condition. On May 
3rd the two pieces of the cork seemed to be sticking together, 
and a more careful looking showed the silvery whiteness with 
which characteristically the Clerus larva lines the cavity 
in which pupation takes place. Up till June 3rd there was no 
pupation, but by the next examination, on June 6th, the larva 
had pupated. The pupation-stage lasted till July 6th, and by 
July 7th the perfect insect had made its way out of the cork 
and was running about in the inside of the bell-jar, more 
than ten months from the day of the larva having entered 
the cork. 
LITERATURE. 
1. Perris. Larves des Coléoptéres, 1878, p. 215. 
2. Sharp. Insects, Part II., p. 255. The Cambridge Natural History. 
3. Fowler. British Coloshes. Vol. I., p. 262. 
4. Ratzeburg. Die — p. 36: 
