1.	Body ovoid, trapezoidal, rhomboidal, hump-backed dorsally; body width distinctly less than diameter of gallery (Figs 2, 4)	2
–	Body elongate, not markedly hump-backed; body width almost the same as that of the gallery (Fig. 7)	4
2.	Prominent pseudopods on meso- and meta-thoracic segments and on abdominal segments 5–8, head broader than long (Figs 2, 4)	3
–	Pseudopods not very prominent on any body segment, head more round	third instar
3.	Only two pairs of spiracles, both the same size, one pair on prothorax and one on abdominal segment 8, head very broad, transversely oblong (Fig. 2)	first instar
–	Nine pairs of spiracles, one pair on prothorax and one pair on each side of first eight abdominal segments, head more elliptical (Fig. 4)	second instar
4.	Pronotum lacking any brown chitinized pattern; mandibles slightly chitinized with teeth on cutting margin (Fig. 6)	fourth instar
–	Pronotum with brownish chitinized patterned consisting of two pairs setae, surrounded by irregular ridges (Fig. 10); mandibles heavily chitinized, apex bluntly pointed and free of small teeth (Fig. 9b)	fifth instar