DAHIRA RUBIGINOSA Moore, 1888 -- Rosy dahira

Female Dahira rubiginosa. Photo: © NHMUK Male Dahira rubiginosa. Photo: © NHMUK

TAXONOMY

Dahira rubiginosa Moore, 1888, Proc. zool. Soc. Lond. 1888: 391. Type locality: [India, Himachal Pradesh,] Mundi [Mandi].

Synonym. Ambulyx rubescens Butler, 1889.

Synonym. Theretra fukienensis Meng, 1986, Entomotaxon 8: 268. Type locality: China, Fujian, Shaowu.


ADULT DESCRIPTION AND VARIATION

Wingspan: 75--86mm. Forewing upperside almost uniformly brown, but with a greyish-blue bloom darkening towards apex; with a small dark discal spot. Hindwing upperside almost uniform orange with a narrow dark brown fringe and blackish-grey basal and tornal area. In Indian examples, forewing dark reddish-brown slightly suffused with grey; with numerous indistinct waved lines. Hindwing bright red; thorax and abdomen yellow below.

In the male genitalia, gnathos nearly as long as uncus. Valve ovate. Harpe long, tapering from one third of length, spatulate at end. Aedeagus with a long evenly curved anteriorly dentate at end process at right side and a short dentate lobe on left side.


Adult of Dahira rubiginosa, Hong Kong, China. Photo: © Roger Kendrick. Adult of Dahira rubiginosa, Jiucai Ling, Guizhou, China. Photo: © Viktor Sinjaev.

ADULT BIOLOGY

The moth rests with the body parallel with the surface, the wings held slightly below the horizontal. When disturbed the moth presses its head against the surface and raises the body at an angle to it (Bell & Scott, 1937).

A species of tall scrub and secondary woodland in northern Hong Kong (Roger Kendrick, pers. comm. 2003).


FLIGHT-TIME

China: i-iv (Guangdong); 17.iii-10.iv (Hong Kong); iv (Guizhou; Yunnan); 30.v (Hong Kong). Taiwan: 2.v (Taipei Hsien).


EARLY STAGES

OVUM: Pale green, slightly oval (1.2 x 1.4mm), shiny and smooth.

LARVA: Full-fed 80mm; width 10mm. According to Bell & Scot (1937), in the final instar head small and round, clypeus about one-half length of head, mandibles very large. Surface of head and body smooth; with no tubercles except on horn. Body tapering frontad from segment 5; rest of body cylindrical. Horn short, slightly down-curved.

In the green form, head green with a pale yellow stripe separating face from cheek; a yellow subdorsal stripe runs from vertex to nape, with a pale double dorsal stripe from vertex to the apex of clypeus. Body green, closely dotted with white above the dorso-lateral stripe, and with yellow below it. This dorso-lateral stripe is yellowish on segments 2 to 4, white and broader on 5 to 12. Horn green, with black tubercles on upper surface. True legs, prolegs and claspers green.

There is also a dark form of the larva in which the head is greyish-black, with the dorsal stripe and a broad band above the mandibles green. The body also bears a subspiracular blackish stripe from segment 2 to 12. Horn shiny black, true legs and prolegs red-brown with a black band. Anal flap and claspers black. Spiracles lying on a greyish-brown patch; other markings as in the green form. Spiracles oval, blue-grey, with the central slit white. The larva becomes reddish-brown before pupation.


Full-grown unmarked green larva of Dahira rubiginosa. Image: Mell, 1922b Full-grown marked green larva of Dahira rubiginosa. Image: Mell, 1922b Immature larva of Dahira rubiginosa. Photo: Mell, 1922b

PUPA: 50-57mm; width 14 mm. Colour soiled iron-grey dorsally, dark rust-red ventrally, the bevels of segments 9 to 11 ochreous-brown. Slender in build, head broadly rounded, with a pointed process directed forwards. Eyebrows raised and prominent and with the central projection making the head appear three-pointed. Clasper-sears also prominent and with the cremaster making the anal end also three-pointed. Antenna equal to fore leg and reaching to half length of wing-case; mid-leg to about three-quarters. Segment 12 of considerably less diameter at its front margin than 11 at its hind margin, the hind margin of 11 deeply undercut, as in the case of Acosmeryx pupae. Surface rugose, with a pit at the angle formed by the eye and the base of the antenna ventrally, as in the pupae of Theretra. Legs and antennae not well expressed; costa of wing prominent; two deep pits behind the spiracle on 5 and 6. Cremaster broad at base, triangular, with a simple point (Bell & Scott, 1937).


Pupa of Dahira rubiginosa. Image: Mell, 1922b Pupa of Dahira rubiginosa. Image: Mell, 1922b

Larval hostplants. Ilex rotunda in Japan.


PARASITOIDS

Unknown.


LOCAL DISTRIBUTION

China: Yunnan (Longling, 1750m); Guizhou (Jiucai Ling); Fujian (Shaowu); Guangdong (Guangzhou); Hong Kong.

Taiwan: Taipei Hsien (Fushan; Lalashan).


GLOBAL DISTRIBUTION

From northwestern India across Nepal and southern China to northern Taiwan and southern Japan.


Global distribution of Dahira rubiginosa. Map: © NHMUK.

BIOGEOGRAPHICAL AFFILIATION



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