Psyche, 1962 
Vol. 69, Plate 7 
Eisner and Happ — Infrabuccal Pocket 
Fig. 1. Profile view of head of worker of Camponotus pennsylvanicus 
(DeGeer), killed shortly after feeding and cleared in KOH, showing infra- 
buccal chamber, plus pharynx and portion of oesophagus, densely packed 
with corundum particles. 
Fig. 2. Same as preceding, but of another individual, in dorsal view. The 
infrabuccal chamber is full, but only few particles are seen in the oesophagus. 
Fig. 3. Worker of Camponotus pennsylvanicus (DeGeer), killed shortly 
after a meal and cleared in KOH, with cuticular shell of gaster dissected 
away to expose the crop and proventriculus. Notice corundum particles in 
the infrabuccal chamber, oesophagus, crop, and in the “calyx” (arrow) of 
the proventriculus. 
