Genetical studies of the lady-bird beetle, Harmonia axyridis PALLAS. (Report IV)

Abstract

In this report two more rare pattern types: aulica (Fig. 1-a, b) and gutta (new name proposed by Prof. T. Komai) (Fig. 1-f, g, h) are dealt with. Both of these are due to the factors (P^Au=factor for aulica, P^G=factor for gutta) belonging to the same allelomorphic series as conspicua, transversifascia, spectabilis, axyridis, forficula and succinea and behave as dominants to succinea.
The heterozygote of axyridis and aulica (P^AP^Au) (Fig. 1-c) and the heterozygote of forficula and aulica (P^FP^Au) (Fig. 1-d) can be distinguished as such from homozygotes. The heterozygote of transversifascia and aulica (P^TP^Au) may be distinguished from transversifascia in that the spot has a concavity on the antero-median side (Fig. 1-e), though in some cases the heterozygote of transversifascia and aulica shows the same appenrance as transversifascia. The distinction between the heterozygote of gutta and axyridis (P^GP^A) and the heterozygote of conspicus and axridis (P^CP^A) and that between the heterozygote of gutta and forficula (P^GP^F) and the heterozygote of conspicua and forficula (P^CP^F) can often made by the fact that the spot is provided with an accessory speck on its antero-median corner, though the speck may be missing in some cases (see Report II, Fig. 1-l, m and Report III, Fig. 1-e). The heterozygote of conspicua and aulica (P^CP^Au), the heterozygote of conspicua and gutta (P^CP^G), the heterozygote of gutta and spectabilis (P^GP^S), the heterozygote of gutta and transversifascia (P^GP^T) and the heterozygote of gutta and aulica (P^GP^Au) can not be distinguished from conspicua; the heterozygote of spectabilis and aulica (P^SP^Au) may shows the same appearance as spectabilis.