Abstract
Large numbers of screw-worm flies (Cochliomyia hominivorax (Coquerel)) marked with tracing powder fluorescent under ultraviolet light were released in the field in the afternoon and recovered during systematic searches on following nights. Flies tended to congregate at streams and pens of livestock, but recoveries from even the most favored locations were not large. More than 90% of recovered flies were found resting on small leafless twigs in low-canopy trees.

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