Griseosphinx marchandi Cadiou, 1996, Novit. zool. 33: 379. Type locality: Tonkin [Vietnam], Hongay [Hon Gay], iv-v.1937.
In the male, head olive with a grey stripe near the eyes. The thorax is olive with dorsal grey hairs. The abdomen is olive dorsally, with grey hairs and a central row of dark green dots. The forewing is elongated and triangular, with a rounded apex and a smoothly curved outer margin. The forewing upperside has a grey base, interspersed with olive and deep green patches, and a black discal spot; the basal area exhibits curved olive lines with an irregularly shaped deep green patch near the discal cell. The marginal area appears whitish, with the apex and veins Rs4 and M1 densely covered in white scales. Ventrally, the forewing transitions from a basal ochre ground color to dark greyish towards the margin. The hindwing upperside is uniformly brownish, while the underside is ochre with a dark greyish marginal area (Jiang, Xu, Lin, Liu, Wang & Hu, 2025).
In the male genitalia, uncus and gnathos form the characteristic 'bird-beak' structure of the Macroglossini. The uncus is straight, ending in a tiny apical hook, while the gnathos is slightly thicker, with a slightly spatulate apex. The valve is oval, and the sacculus tapers to a sinuate, sharp hook that is distinctly upcurved apically. The phallus is short and straight, terminating in a bilobed apical process; one lobe is short and broad, edged with several spines, and the other lobe is slender, ventrally projecting, and apically dentate (Jiang, Xu, Lin, Liu, Wang & Hu, 2025).
High elevation evergreen broad-leaf forest - 1840m altitude (Jiang, Xu, Lin, Liu, Wang & Hu, 2025).
China: 4.v.2024 (Guangxi).
OVUM: Unknown.
LARVA: Unknown.
PUPA: Unknown.
Larval hostplants. Unknown.
Unknown.
China: Guangxi (Chongzuo, 1840 m).
China (SW Guangxi) and northern Vietnam
Map: Global distribution of Griseosphinx marchandi (© Jiang, Xu, Lin, Liu, Wang & Hu, 2025).
Holarctic; eastern Palaearctic region. Pleistocene refuge: Monocentric -- Yunnan refugium.
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