S. Mahunka szerk.: Folia Entomologica Hungarica 48. (Budapest, 1987)

Into the fifth Instar begins in May next year. Male L4 larvae develop sooner into L5, and L5 larvae into adult stage than the females. Adults appear from the middle of July on, hibernate, and after mating and oviposition quickly disappear from the samples. It is suspected, that dead, consequently, without active protection not or less stinking individuals are soon removed by ants. Phenology of the parallel generations is shown in Fig. 2. Fig. 1. Age-group diagrams of subsequent samples (Vácrátót, 1981) Fig. 2. Phenology of the two generations. A = adults, E = eggs, Lj_

5 = larval instars 4. Sex rati o Sex of L4 larvae was not identified thus sex ratio was followed from the fifth instar on. As mentioned above male larvae moult sooner than females, the proportion of males of a given stage is higher at the beginning of the "period" of the stage, then it is shifted in favour of the females. Ratio of sex of the adults in the winter samples (X-II) and also in the spring samples (IV-V) in over four years is given in Table 2-, that of L5 larvae and adults in 1983-1984 in Table 3. From both the sex ratio in winter seems to be about 40:60 % here and with the longer life of males, the ratio changes a little in spring. 48 % of all adults collected in Vácrátót were male. These are in congruence with the results of others (e. g. TERHO and HE

LIÖVAARA 1981). Table 2. Sex ratio in winter and spring (IV-V) samples in four years (Vácrátót. 1978-79 81-82) 1978-79 1979-80 1980-81 1981-82 Winter males % 41 40 43 51 spring males % 37 55 50 no data