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Psyche 
[Vol. 91 
Fig. 5. (Above and facing page) SEM micrographs of the mesosoma of workers 
of several formicine species. Arrow indicates region where the opening of the 
metapleural gland should be located, a. Camponotus pennsylvanicus; b. Campo- 
notus consobrinus. In both species there are clusters of hairs visible in the area of the 
metapleural gland opening. Both species, however, lack a slit-shaped opening, 
c. The slit-shaped opening of the metapleural gland of Camponotus gigas. No 
opening can be detected in d. Colobopsis truncata; e. Dendromyrmex chart if ex; 
f. Polyrhachis ( Cyrtomyrma )? doddi. 
