1974] 
Jeanne & Fagen — Stelopolybia 
165 
example, figured by Evans and Eberhard (1970), have an enlarged 
petiole. Both of these species form large colonies. This is consistent 
with the conclusion of Richards and Richards (1951) that species 
which form larger colonies tend to have more distinctive queens. 
Acknowledgments 
We are grateful to Dr. Antonio Lot Helgueras of the Department 
of Botany, Universidad Nacional Autonoma de Mexico, for making 
available the facilities of the Estacion de Biologia Tropical ‘Los 
Tuxtlas’ and to members of the staff of the Estacion for their help. 
Dr. Jose Sarukhan, Dr. Raul MacGregor, Dr. Arturo Gomez- 
Pompa, and Dr. Carlos Marquez Mayaudon, all of UNAM, also 
deserve thanks for their help in making arrangements for the field 
work. Mr. Mark Winston helped in the field and with the measure- 
ment of the wasps. Dr. O. W. Richards kindly confirmed the iden- 
tification of the wasp. Dr. E. O. Wilson provided helpful com- 
ments and advice in the preparation of the manuscript. The research 
was supported by the National Science Foundation (GB-33619) and 
by the Boston University Graduate School (GRS-303-B1 ) . 
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