cytes, well defined function of rhegmatocytes by the coagulation; plasmatocy- 

 tes and transitional forms from nucleocytes to plasmatocytes are a hemocyte 

 category actively participating in the phagocytosis. The consistent assertion 

 of the functional point of view in the classification of hemocytes has been 

 very difficult so far. The function of hemocytes in the phagocytosis is clear 

 but since the time of Metalnikov, Hollande and Paillot the insect im- 



Fig. 2. Changes in proportional representation of individual hemocyte types during the 

 metamorphosis and imago. Abscissa: age ■ — Xllth instar 24 hours after moulting. 



О imago immediately after moulting, 2 — imago two days after moulting, 4 — four 



days aged imago, 8 — eight days aged imago, 16 — sixteen days aged imago. Percentual 

 representation of individual hemocyte types dviring the development is made evident 

 by the breadth of the zone in the definite place (for the given age). Hemocytes marked 



as in Fig. 1. 



munity has been studied rather rarely and without important new discoveries. 

 The results of authors are often very different. The function of hemocytes 

 in the metamorphosis (Perez) is clear; besides of being active in phagocytosis, 

 participating in the formation of the fat body and connective membranes, 

 adhering to some growing tissues and perhaps further organs they take part in 

 metabohc processes as shown recently by Wiggles worth. To elucidate some 

 hemocyte functions it seemed advantageous to study changes of the blood 

 picture during the individual development. 



If we examine the blood picture of several specimens of the same instar 

 the results appear to be rather variable. The mean values obtained from more 

 individuals of the same instar during the development (followed from the 3rd 

 instar) show no striking deviations from the clearly pronounced tendency 

 of the development of the blood picture (Fig. 1). As to the frequency of indivi- 

 dual types, the plasmatocytes are most numerous (about 50 p. c), further 



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