304 
Psyche 
[December 
Figure 4. Above: Sagital section through pygidial glands of Pogonomyrmex 
calif ornieus: No definite reservoir, but large cell clusters, each containing 30-35 
glandular cells (GC). Below: Pygidial gland of Pseudomyrmex ferruginea: No distinct 
reservoir; intersegmental membrane forms a chitinous duct (D) into which the 
individual glandular channels open. 
