D. linearis (54–57, 60–64), D. aequata (58, 59, 65–68), mature larva (54–56, 58), first larval instar (57, 59, 60), prepupa (61), cocoon (62, 63), cocoon and pupa (64), pupa (65–68). 54, 55 abdominal segments VIII-X in dorsal (54) and lateral (55) aspect 56, 57 tergal gland reservoir of segment VIII 58–60 abdominal segments IX and X in ventral (58, 59) and lateral (60) aspect 61, 62 pupal cocoon 63 prepupa in lateral aspect 64 ripped cocoon with pupa inside in lateral aspect 65–68 pupa in ventral aspect (65), front of head (66), terminal abdominal sternites VII–IX (67) and microstructure of abdominal sternite VIII (68). Abbreviations: Ah anal hooks, Fr frons, Lr labrum, Md mandible, Mp maxillary palp, Op opening of gland reservoir, Pg pretergal gland, R tergal gland reservoir, Sp spiracle, St sternite, Te tergite, Tp terminal prolongation, Ug urogomphus.