1986] Luykx, Michel, & Luykx — Incisitermes 361 
a colony grows, the wood in the center of the colony is often used 
up, and the members of the colony then spread upwards and 
downwards from the center. 
Acknowledgments 
This work was supported by grant no. BSR-81 19692 from the 
National Science Foundation. We are grateful to Dr. Steven Green 
for suggestions on how to evaluate the distribution of the major 
castes (Figs. 3 and 4), to Dr. Keith Waddington for comments on 
the manuscript, and to Carol A. Provost for help in preparing the 
figures. 
Summary 
Nine colonies of the dry-wood termite Incisitermes schwarzi were 
rapidly cut into segments in the field, and the numbers of individu- 
als of different castes in each segment analyzed in order to learn 
something about the distribution of castes within natural colonies. 
The main findings are that the royal pair is usually in the lower part 
of the colony, associated with small larvae; the mean position of 
soldiers is usually higher than the mean position for the whole col- 
ony; and, relative to the pseudergates, the early-stage nymphs, late- 
stage nymphs, and alates are successively more clumped or 
aggregated within the colony. 
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1987. Termite colony dynamics as revealed by the sex- and caste-ratios of 
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