- 
xlii 
segmented bodies, with blunt anterior and posterior ends, a 
large head ventrally placed, and short, rudimentary antennae. 
The thoracic and first abdominal segments are furnished with 
peculiar exudatory papillae, which form a cluster around the 
mouth. They have the form of extraordinary appendages, 
which in the first larval stage, Wheeler has called the tro- 
phidium; and the swollen ventral portion of the first 
abdominal segment just behind the mouth forms a pocket, 
Vig. 2.—Head, trophothylax and exudatoria of larva of 
Pseudomyrma gracilis abr. 
the trophothylax, in which the workers place the pellet from 
their own infra-buccal chamber. 
We have described this pellet and chamber in “ British 
Ants” as follows: ‘* The infra-buccal chamber is a spherical 
cavity situated below the pharynx, and forms a receptacle 
for the solid and semi-solid parts of the food rasped off by 
the ant’s tongue and also for foreign matter scraped off the 
ant’s body by its tongue and strigils. Any juices that remain 
in these substances are extracted and sucked into the pharynx, 
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