Thamnoecha
Similar in colour to small specimens of Sphinx pinastri and Sphinx caligineus. Palpus small, rough. Proboscis short.Tibiae not spiny; spurs very short, hind tibia without proximal pair. Arolium absent; pulvillus very small, without lobes. Foretarsus with 1st segment with 4 long spines, the apical one nearly half the length of the segment; 2nd segment as long as 1st.
Male genitalia: Uncus narrow, curved, pointed, compressed. Gnathos broad, obtuse, weakly sinuate apically. Valve narrow, without a patch of stridulatory scales; subdorsal fold of inner surface high, with bristles. Harpe simple, not dentate, ending in an obtuse process. Phallus thin, produced into a flat, weakly concave process curving sideways, ending in a very short pointed hook.