Changes in the total haemocyte counts of the bug, Halys dentata, under certain specific conditions

The changes in total haemocyte counts (THC) in relation to sex, development, ecdysis, and hot-water fixation have been studied in Halys dentata (Hemiptera). Whereas statistically there is no difference in the THC of the two sexes, the THC differs in the immature stages and adults. There is a gradual increase in counts during metamorphosis. The fixation of insects in hot water before withdrawal of haemolymph abruptly affects the THC and it shows a significant increase in the number of haemocytes. Studies made in relation to ecdysis show that the THC slightly decreases 24 hr before ecdysis, whereas after ecdysis it abruptly falls and then rises again during the middle part of the instar.