Substitute names for two hemipteran genera names preoccupied by trilobites genera (Hemiptera)Abstract : Two junior homonym genus group names were detected among the hemipteran genus group names. So, the following replacement names are herein proposed: Koteya nom. nov. for Keithia Koteja, 2000 and Youngus nom. nov. for Yunnanaspis Young, 1986. Accordingly, new combinations are herein proposed for the species currently included in these genus group names. Koteya luzzii (Koteja, 2000) comb. nov. and Youngus rubus (Young, 1986) comb. nov.