HAYESIANA TRIOPUS (Westwood, 1847) -- Nonsuch hawkmoth

Female Hayesiana triopus. Photo: © NHMUK Male Hayesiana triopus. Photo: © NHMUK

TAXONOMY

Macroglossa triopus Westwood, 1847, Cabinet oriental Ent.: [14], pl. 6, fig. 4. Type locality: [India,] Assam.

Synonym. Macroglossa triopus Westwood, 1847.


ADULT DESCRIPTION AND VARIATION

Wingspan: 64--78mm. An unmistakeable species. Forewing upperside dark grey-green (fading to greyish-brown) with six narrow transverse blackish bands; discal spot large, rectangular and translucent. Hindwing upperside black with conspicuous white costal patch and tornal area. Hindwing underside reddish orange (as abdomen underside). Metanotum dark brown with creamy white stripes. Abdomen upperside black with an interrupted belt red and lateral orange spots. Underside of thorax and abdomen reddish-orange.


Adult Hayesiana triopus, Fraser's Hill, Pahang, Peninsular Malaysia, 22.x.2015. Photo: © CheongWeei Gan. Adult Hayesiana triopus, Simao/Pu'er, Yunnan, China, 10.viii.2017. Photo: © John Horstman. Adult Hayesiana triopus, Hong Kong, China, 2015. Photo: © Wenda Cheng. Adult Hayesiana triopus at Agapanthus flowers, Hong Kong, China. Photo: © Roger Kendrick

ADULT BIOLOGY

A diurnal species with a fast but bumbling flight -- has difficulty pinpointing flowers. Attracted to the flowers of Agapanthus africanus in Hong Kong. Will fly during damp, overcast conditions and in hot, sunny weather, generally during the the late morning and early afternoon (R. Kendrick, pers. comm., 2000). The resting position is the same as for those of the genus Macroglossum (Bell & Scott, 1937).


FLIGHT-TIME

China: vi (Guangdong; Hong Kong); 10.viii (Simao/Pu'er, Yunnan); ix (Hong Kong).


EARLY STAGES

OVUM: Broadly ovoid; surface smooth and shiny; colour pale grass-green; size larger than those of Macroglossum and Cephonodes (Bell & Scott, 1937).

LARVA: Full-fed 70mm, width 11mm, horn 14mm. According to Bell & Scott (1937), in the final instar head round, surface smooth. Body tapering sharply frontad from segment 5; horn long, stout, laterally compressed, ending in a sharp point, basal half gently upcurved, distal half gently down-curved. Surface of body dull and smooth except for four small tubercles on the front half of each of segments 6 to 11, on the dorso-lateral stripe, those on 7 and 8 larger than the rest. Horn with tubercles on dorsal and ventral surface.

In colour, head green, with a white stripe separating face from cheek. Body pale green, the divisions between the secondary rings white. There is an indistinct dark green dorsal stripe and a white dorso-lateral stripe, the latter clearly defined on 2 to 4, faint on 5 to 11, and with white tubercles on 6 to 11, edged above with dark green on these segments. There are bluish-white oblique lateral stripes, which are clearest on 7 to 9. Horn bluish-green with a small, triangular, bluish latero-basal patch, the tubercles green. True legs pale flesh-colour, outer faces red; shanks of prolegs dull terracotta. Spiracles pure white with a broad transverse brick-red band across the middle of all except those on segments 11 and 12, which are immaculate white and twice as large as the rest (Bell & Scott, 1937).


Full grown larva of Hayesiana triopus. Image: Mell, 1922b

PUPA: 42--52mm, breadth 11--14mm. Very like that of Cizara sculpta in shape. In colour, tongue greyish-green, darker at tip; thorax and wing-case greyish-green; two pale chestnut spots on segment 2. Legs dark chestnut barred with pale orange, abdomen pale ochreous-brown above, reddish-brown with short longitudinal chestnut lines below; bevels of free abdominal segments dark chestnut. There are broad blackish patches and short black lines between the spiracles of segments 3 to 10. Tongue-case projecting slightly beyond the frons; antenna equal to fore leg, coxal piece absent or rudimentary. Surface smooth and shiny. Cremaster conical, tapering gently to a short, widely bifid tip (Bell & Scott, 1937).


Pupa of Hayesiana triopus. Image: Mell, 1922b

Larval hostplants. Adina globiflora (Rubiaceae) in India (Bell & Scott, 1937).


PARASITOIDS

Unknown.


LOCAL DISTRIBUTION

China: Yunnan (Simao/Pu'er); Guangdong (Longtou Shan); Hong Kong; Guangxi (Longmen).


GLOBAL DISTRIBUTION

Nepal, Bhutan, northeastern India, southern China, Thailand and northern Vietnam. Also recorded from Fraser's Hill, Peninsular Malaysia (CheongWeei Gan, pers. obs. 2015)


Global distribution of Hayesiana triopus. Map: © NHMUK.

BIOGEOGRAPHICAL AFFILIATION



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© A.R. Pittaway & I.J. Kitching (The Natural History Museum, London)