Adiscus mouhoti ( Baly, 1877 )

Duan, Wen-Yuan & Zhou, Hong-Zhang, 2022, Revision of the genus Adiscus Gistel, 1857 (Coleoptera: Chrysomelidae, Cryptocephalinae) from mainland China, Zootaxa 5096 (1), pp. 1-80 : 51-54

Adiscus mouhoti ( Baly, 1877)

(Figs 21-1; 21-2)

Dioryctus mouhoti Baly, 1877: 36 (type locality: Laos, Siam; type deposited: BMNH); Kimoto & Gressitt, 1981: 325; Schöller et al., 2010: 608 (junior synonym of A. laetus ); Löbl & Smetana 2013: 45 (valid).

= Dioryctus laetus Weise, 1904: 161 (type locality: China; type deposited: ZMHB);

Adiscus laetus: Gressitt & Kimoto, 1961: 118 (Kwangtung, Hainan); Tan et al., 1980: 168; Kimoto & Gressitt, 1981: 325 (as synonym of Adiscus mouhoti ); Schöller et al., 2010: 608 (valid); Löbl & Smetana 2013: 45 (synonymy).

= Dioryctus grandis Hoffmann, 1937: 632 , nec Baly, 1865: 64 [misidentification]; Gressitt, 1942: 333 (Kwangtung).

= Dioryctus rubripennis Pic, 1926a: 12 (type locality: China; type deposited: MNHN);

Adiscus rubripennis: Gressitt & Kimoto, 1961: 118 (as synonym of Adiscus laetus ).

= Adiscus kabakovi Medvedev & Samoderzhenkov, 1987: 23 (type locality: Vietnam); Medvedev, 2008: 203 (as synoym of Adiscus mouhoti ).

Material examined. CHINA: Guangxi Province: 3 males, Mt. Yao [Yaoshan], V–VI, 1938, coll. unknown ( IZ-CAS) ; 1 male, Yangshuo , 21. VII. 1963, coll. Shuyong Wang ( IZ-CAS) ; Yunnan Province: 1 male, Xishuangbanna Mengsong , 28. IV. 1958, coll. Fuji Pu ( IZ-CAS) ; 1 male, Xishuangbanna Menghai , 18. VIII. 1958, coll. Shuyong Wang ( IZ-CAS) ; 2 females, Xishuangbanna Menghai , 19. VIII. 1958, coll. Shuyong Wang ( IZ-CAS) ; 1 male, Xishuangbanna Menghai , 16. VII. 1958, coll. Shuyong Wang ( IZ-CAS) ; 4 males, Xishuangbanna Menghai , 2. VII. 1958, coll. Shuyong Wang ( IZ-CAS) ; 2 females, Xishuangbanna Menghai , 22. VII. 1958, coll. Shuyong Wang ( IZ-CAS) ; 1 female, Xishuangbanna Menghai , 22. VII. 1958, coll. Fuji Pu ( IZ-CAS) ; 1 male, 2 females, Xishuangbanna Menghai , 23. VII. 1958, coll. Shuyong Wang ( IZ-CAS) ; 1 male, Xishuangbanna Menghai , 24. VII. 1958, coll. Shuyong Wang ( IZ-CAS) ; 1 male, 3 females, Xishuangbanna Menghai , 26. VII. 1958, coll. Fuji Pu ( IZ-CAS) ; 1 female, Xishuangbanna Mengzhe , 30. VIII. 1958, coll. Shuyong Wang ( IZ-CAS) ; 1 female, Xishuangbanna Mengzhe , 2. IX. 1958, coll. Shuyong Wang ( IZ-CAS) ; 2 males, Xishuangbanna Mengzhe , 3. IX. 1958, coll. Fuji Pu ( IZ-CAS) ; 1 female, Xishuangbanna Mengzhe , 4. IX. 1958, coll. Fuji Pu ( IZ-CAS) ; 1 male, Xishuangbanna Mengzhe , 5. IX. 1958, coll. Shuyong Wang ( IZ-CAS) ; 1 female, Xishuangbanna Xiaomengyang , 23. VI. 1957, coll. Lingchao Zang ( IZ-CAS) ; 1 female, Xishuangbanna Xiaomengyang , 7. VII. 1957, coll. Shuyong Wang ( IZ-CAS) ; 1 female, Xishuangbanna Xiaomengyang , 9. VII. 1957, coll. Shuyong Wang ( IZ-CAS) ; 1 male, Xishuangbanna Xiaomengyang , 12. VII. 1957, coll. Lingchao Zang ( IZ-CAS) ; 1 female, Xishuangbanna Xiaomengyang , 12. VII. 1957, coll. Shuyong Wang ( IZ-CAS) ; 1 male, Xishuangbanna Xiaomengyang , 2. IX. 1957, coll. Shuyong Wang ( IZ-CAS) ; 1 male, Xishuangbanna Xiaomengyang , 19. X. 1957, coll. Shuyong Wang ( IZ-CAS) ; 3 females, Xishuangbanna Xiaomengyang , 25. X. 1957, coll. Lingchao Zang ( IZ-CAS) ; 2 females, 2 males, Xishuangbanna Xiaomengyang , 26. X. 1957, coll. Lingchao Zang ( IZ-CAS) ; 1 male, Xishuangbanna Xiaomengyang , 22. VI. 1958, coll. Fuji Pu ( IZ-CAS) ; 1 female, Xishuangbanna Xiaomengyang , 1. IX. 1958, coll. Xuwu Meng ( IZ-CAS) ; 1 male, Xishuangbanna botanical garden, 22. VII. 2007, coll. Guocai Zheng ( IZ-CAS) ; 1 female, Yiwubannan Menglun , 3. VIII. 1959, coll. Zhenfu Li ( IZ-CAS) ; 1 male, Jingdong , 30. VI. 1956, coll. Deyin Lin ( IZ-CAS) ; 2 females, Jingdong , 30. VI. 1956, coll. Krezenovsky ( IZ-CAS) ; 2 females, Lancang , 3. VIII. 1957, coll. Shuyong Wang ( IZ-CAS) ; 1 female, Lancang , 10. VIII. 1957, coll. Lingchao Zang ( IZ-CAS) .

Redescription. Measurements. Males. BL = 3.74–3.99 mm, BW = 2.88–3.25 mm, HL = 1.31 mm, HW = 1.14 mm, PL = 1.36 mm, PW = 2.96 mm, PA = 130°, EL = 2.91 mm, EA = 100°, AL = 1.30 mm, AW = 0.43 mm.

Females. BL = 4.02–4.46 mm, BW = 3.12–3.63 mm, HL = 1.43 mm, HW = 1.24 mm, PL = 1.49 mm, PW = 3.21 mm, PA = 130°, EL = 3.15 mm, EA = 100°, SL = 0.64 mm.

Body (Figs. 21-1A; 21-2A) short and round, strongly convex; dorsum shiny, orange colored. Mandibles black; antennomeres 1–5 yellow, 6–11 black. The basal margins of pronotum and elytra, and claws black.

Head small, finely and densely punctate. Eyes reniform, deeply emarginate below middle, superior eye-lobes separated by slightly greater distance than antennal insertions. Clypeus densely and sparsely punctate, anterior margin arched and emarginated apically. Antennae short, reaching elytral humeri, scape broadened, pedicel short, spherical, antennomeres 3 and 4 slender and small, about equal in length, 5 slightly broadened, 6–11 strongly broadened and flattened.

Pronotum (Figs. 21-1A; 21-2A) smooth, base much broader than apex, basal width about twice pronotal length. Anterior margin nearly straight. Posterior margin slightly sinuate with fine serration, and produced into an obtuse angle of about 130° at middle. Disc evenly convex, impunctate and glabrous.

Elytra (Figs. 21-1A; 21-2A) as broad as long, humeri slightly prominent, glabrous. Disc coarsely punctate, with 11 regular striae, intervals nearly impunctate,. Epipleural lobe (Fig. 21-2B) large, lateral margins distinctly expanded ventrally with rounded lobe at basal 1/2 of elytron, with both lobe sides forming angle of 100°, epipleura obliquely placed and visible in lateral view.

Venter clothed with sparse short pubescence. Prosternum (Fig. 21-2C) broadly quadrangular, lateral ridge elevated; anterior margin protruding, subtriangular. The femora of middle and hind legs more robust than front legs.

Aedeagus. (Figs. 21-1D–F; 21-2D–F) Median lobe elongate, about 3 times as long as wide, middle part parallelsided.Apex of median lobe slightly narrower than middle, acute at apex, strongly curved in lateral view; with several setae on each side of apex and distal part of ventral part, densely punctate on ventral side of distal part. Median orifice with median sclerite bending inwards above surface. Inner sac oblong, cylindrical, base narrowed and with two attachments protruding, bilobed and acute at apex. Tegmen Y-shaped, weakly sclerotized, almost translucent.

Female. Body more robust than male, apical hollow in ventrite 5 deep and round. Spermatheca (Figs. 21-1C; 21-2G) falcate, 60°-angled from apex 2/3, acute at apex, duct weakly sclerotized, irregularly coiling 5–6 times. Rectal sclerites (Fig. 21-1G) moderately sclerotized, not connected between two rectangular sclerites on ventral side.

Distribution. China (Guangdong, Guangxi, Hainan, Yunnan).

Remark: Dioryctus mohouti ( Baly, 1877) from China was erroneously synonymised with D. grandis Baly, 1865: 64 (from Sumatra, Indonesia) because of a misidentification (Hoffman, 1937) and later mistakenly placed as a junior synonym of D. laetus Weise, 1904 ( Schöller et al. 2010). This mistake was rectified by Löbl & Smetana (2013). There is a large gap in the geographical distributions of these two speies as there is no record of either in Indo-China (between the Malay Peninsula and South China).