310 B. GRASSI AND A. SANDIAS. 
VIII. Certain Habits. 
The swarming will be first described. 
A swarm was observed on May 14th, 1891. A host of 
Termites issued in groups of two to five from a single crack in 
a tree-trunk, rose on the wing for about three metres, and 
then followed the direction of the wind. Many fell on the 
neighbouring plants, and others were seized by ants as they 
emerged. The swarm began at 10 a.m., and lasted for more 
than two hours. 
This incomplete observation was made by the laboratory 
servant, who chanced to see a similar occurrence on May 24th, 
1891. In the second case the winged forms were seen to issue 
from several holes, at which a few soldiers and workers also 
appeared. The imagos were all destroyed, at first by two 
lizards, which remained on watch near the nest and devoured 
them directly they appeared. When the lizards were driven 
off the insects were seen to come out in groups of six or eight, 
run a certain distance, spread their wings, and then take 
flight. At first they rose a certain height, and then followed 
the direction of the wind (a light scirocco). A few struck 
against branches and fell to earth, but they quickly got up 
again. This swarm lasted from about 9.30 to 11 a.m. When 
it was over the nest was opened, and found to contain many 
imagos ready for swarming about half a metre from the exit- 
holes. These were all females, as were those (twenty-six) 
collected during the swarm. 
Sinilar swarms were observed on various other occasions. 
One of special interest took place in the laboratory from the 
nest in a glass jar, which I have previously described, men- 
tioning its occurrence on June Ist. The details are now given. 
Towards the end of April I examined the nest at the bottom 
of the jar, and observed the appearance of perfect insects, 
some brown, others still white, but becoming brown in the 
course of afew days. After May 20th, suspecting that swarm- 
ing would take place soon, I covered the vessel with a wider 
and taller glass bell-jar. Both were placed on a pane of glass, 
