Dolbina exacta Staudinger, 1892, in Romanoff (ed.), Mém. Lépid. 6: 222. Type locality: [Russia, Khabarovsk Kray] Bikin; [Russia, Amurskaya/Khabarovsk Kray] southern Amur region.
Wingspan: 55--58mm.
An open parkland and forest edge species.
China: vii (Heilongjiang); 14.vii (Hubei); 21.vii (Zhejiang); viii (Shaanxi); 4.viii (Beijing); ?12.viii (Guangxi). North Korea: vii (Baekdu-san); vii (Jueul). Japan: 3.vi (Hokkaido); 7.vi-18.viii (Honshu); 14.vii-18.viii (Hokkaido). Russia: 2-16.vi (Primorskiy Kray); 2-28.vii (Primorskiy Kray); 5-24.vii (Khabarovsk Kray); vii-viii (Primorskiy Kray); 11-23.viii (Primorskiy Kray); 20.viii (Amurskaya).
Park et al. (1999) give mid April until late August as the flight period in Korea.
OVUM:
LARVA: Full-fed 70 mm.; breadth 11 mm.; horn 8.5 mm. In the final instar head shortly triangular, a little higher than broad. True clypeus one-third length of head, each basal angle with a small tumidity. False clypeus with acute apex reaching to one-half length of head. Labrum less than half length of clypeus; ligula as long as labrum. Surface dull, set widely with small, low tubercles. Body gently tapering frontad from segment 7. Horn long, straight, thick at base and tapering evenly to a fine point. Secondary rings of segments 2 to 4 raised into ridges on dorsum. Horn covered densely with small pointed tubercles. There are large, round, closely-set tubercles on the anal flap and claspers.
In most, the head is greyish-green with a broad, pale yellow cheek-stripe from vertex to base of antenna. False clypeus dark green; labrum and ligula rust-coloured; basal segment of antenna dark brown, other segments rust-coloured; mandible dark orange with tip black. Body greyish-green with a glaucous suffusion on dorsum. Oblique lateral stripes white or pale yellow, edged frontad with apple-green for part of their length, with each crossing two segments. Horn, anal flap and claspers apple-green. True legs pale orange, base rose-coloured; prolegs green. Spiracles reddish-brown with a white central slit widening slightly at top and bottom, the whole ringed with yellow, oval in shape and flush. In some specimens there are carmine patches round the spiracles, above the oblique stripes and at bases of true legs. In this form the basic body colour tends more towards apple-green, the oblique side stripes towards yellow. Each form becomes intense reddish-purple dorsally prior to pupation.
Generally feeds at about 1-4m from the ground, hanging suspended from the petiole of a leaf. Not a very active species.
PUPA: 40--48 mm; breadth 14 mm. Colour chestnut to blackish-brown, the bevels of the free abdominal segments paler; the spiracles brown. Smerinthine in shape, rather like that of Marumba dyras, thickest in the middle. Shoulders evenly rounded; dorsum of segment 2 very steeply inclined, rising nearly at right angles to the axis of the body, the dorsal line of 3 being nearly parallel with the axis. Tongue equal to fore leg, reaching to about the middle of wing-case; mid-leg longer, antenna slightly longer than fore leg. There is no coxal piece. Surface shiny, irregularly corrugate on the head and thorax, elsewhere pitted with coarse shallow pits, except on wing-case. There are weak ante-spiracular ridges on segments 8 to 10, in the form of three short parallel ridges on each. Spiracle of segment 2 crescent-shaped; the remaining spiracles oval. Cremaster stout, bulbous when viewed laterally, ending in a short bifid tooth. The dorsal surface very rugose except for the tooth, which is smooth.
Larval hostplants. Recorded in China (Chengde) from Fraxinus (Pittaway, pers. obs. 2003). In Primorskiy Kray, Russia, on Fraxinus and Syringa amurensis (Graeser, 1888; Derzhavets, 1984), and in Japan on Fraxinus lanuginosa (Sugi, 1987).
Izerskiy (1999b) gives Fraxinus mandshurica and Syringa amurensis for the Russian Far East.
Recorded in Korea on Ligustrum obtusifolium, Syringa reticulata and Fraxinus rhynchophylla (Park et al., 1999).
Unknown.
China: Heilongjiang (Harbin); Hebei (Chengde); Beijing; Shaanxi (Feng Xian); Zhejiang (Tianmu Shan); Hubei (Shennongjia); Sichuan; ?Hunan (Dayong); ?Guangxi (Liuzhou).
North Korea: North Hamgyong Prov. (Jueul, 1500m; Baekdu-san, 2500m); Kangwon Prov. (Keumgang-san).
South Korea: Kyonggi Prov. (Suri-san; Gwangleung; Chukryong-san; Soyo-san); Kangwon Prov. (Pungtung; Samak-san; Seolak-san; Jeombong-san; Yangyang; Bangtae-san; Balwang-san; Chiak-san; Taebek-san; Odae-san; Hwacheon; Chuncheon; Yaksu-san); North Chungchong Prov. (Songni-san; Chupunggryung; Minjuji-san; Wolak-san); North Cholla Prov. (Jiri-san; Naebyun-san; Namwon; Muju); South Cholla Prov. (Baekyang Temple; Jin-do; Dolsan-do; Gwangyang; Gurye; Yeocheon; Haenam); North Kyongsang Prov. (Seondal-san; Sobaek-san; Juwang-san; Naeyon-san; Gunwi; Cheongrang-san; Seongju; Youngcheon; Cheongdo); South Kyongsang Prov. (Baekun-san; Gibaek-san; Yeohang-san; Muhak-san; Gaeam-san; Geoje-san; Geochang; Goseong; Gimhae; Namhae; Sacheon; Sancheong; Yangsan; Ulsan; Jinju; Tongyoung; Hadong; Hamyang; Hapcheon); Cheju Prov. (Sungpanak; Cheju-do; Seoguipo; Suakbong; Hare-ri; Halla-san; Namwon; Wisseorum; Ara-dong; Haean-dong).
Japan: Hokkaido (Kushiro; Tokachi; Noboribetsu); Honshu (Tokyo; Kyoto; Onyu; Takefu; Kumanotaira; Mikaboyama, 750m; Naka-Karuizawa; Shinbo; Iruma; Yashajin Pass); Kyushu.
Russia: Amurskaya (Kirov); Khabarovsk Kray (Slavyanka; Bikin); Primorskiy Kray (Andreevka; Bukhta; Vladivostok; Khasan; Ussuriysk; Jankowski Peninsula; Kedrovaya Pad nature reserve).
Occurs from the southern Russian Far East, Japan and the Korean Peninsula (Kim et al., 1982), south into China as far as Sichuan, Hubei and Zhejiang. Records from Hunan (Wang, 1992) and Guangxi (NAUY) require verification.
Holarctic; eastern Palaearctic region. Pleistocene refuge: Polycentric -- Japanese and Sinopacific refugia.
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