262 D. WARD CUTLER 
describes A. wroughtoni as ‘one of the most primitive 
of living Termites’. The association, therefore, of primitive 
parasites or ‘ guests ’, whichever the case may be, with a primi- 
tive host is extremely interesting, and is suggestive that the 
two groups of organisms have remained associated together 
for a long period, neither havmg developed into more complex 
species, as has occurred with other termites and their associated 
protozoa. 
In conclusion, I wish to express my thanks to Mr. J. Bb. 
Robinson for re-drawing for publication, with the exception 
of figs. 4, 5, 6, and 7, the figures illustrating this paper. 
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