Immature stages of Liopiophila varipes (Meigen) and Stearibia nigriceps (Meigen). 1. Egg of L. varipes, scale bar 0.01 mm; 2. Third-instar larva of L. varipes, scale bar 1.5 mm; cps – cephalopharyngeal skeleton; psp – posterior spiracle; 3. Anal division of third-instar larva of L. varipes, lateral view, scale bar 0.5 mm; 4. Anal division of third-instar larva of S. nigriceps, lateral view, scale bar 0.5 mm; dt – dorsal tubercles; ldc – laterodorsal cone; lvc – lateroventral cone; psp – posterior spiracle; vt – ventral tubercle; 5. Posterior spiracles of L. varipes, scale bar 0.08 mm.