Abstract
Summary
The average hemocyte velocity in the subcostal cell of the elytron of the cockroach, Periplaneta americana Linn., is 34.3 ± 14.4 mm. per minute. The range of normal average velocities extends from 14.5 to 65.2 mm. per minute. This range approaches the range of 30 to 54 mm. per minute found in the capillaries of man. The highest hemocyte speed observed was 65.5 mm. per minute; the lowest 10.1. No relationship was detected between variations in velocity and sex or the heart rate of the insects used for this study.
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