248 
Psyche 
[Vol. 91 
Figs. 3-5. Larva of Brachygasira scutellaris: 3, frontal view of head capsule; 
4, mandible; 5, maxilla. 
another major character in Richards’ key to genera (with the excep- 
tion of lecheguana), but care must be used in this feature. Number 
of setae varied within the 2 colonies, but was always low. 
Conclusion 
Our results support the general view that caste dimorphism is 
poorly developed or absent among Polistinae. Where differences 
were found (Polybia catillifex, Brachygastra scutellaris), queens 
were larger than workers. Among the Polistinae where differences 
have been detected, queens are the larger caste, except in a few 
