Leiobracon gen. nov. will run to couplet 10 in the key to world genera by Quicke (1987), where it can be distinguished from Pseudoshirakia as follows (based on female):

10a Metasoma largely smooth and its second suture shallow, smooth (Figs 1B, 2F); first metasomal tergite more than 2.6 × longer than wide medially, its lateral areas largely reduced and without crenulations; second metasomal tergite triangular, without triangular basal area (Fig. 2F)..................................... Leiobracon Long & van Achterberg, gen. nov.

10b Metasoma largely sculptured and its second suture deep, crenulate (Fig. 4B); first metasomal tergite less than 2.0 × longer than wide medially and its lateral areas distinct and with crenulations; second metasomal tergite rectangular with triangular basal area (Fig. 4B).......................................................... Pseudoshirakia van Achterberg, 1993