Xenysmoderes ruficollis, Yoshitake, 2005

Yoshitake, Hiraku, 2005, Taxonomic Position of a Taiwanese Ceutorhynchine, Mecysmoderes consularis Pascoe (Coleoptera: Curculionidae), with Description of an Allied New Species from Lanhsu Island, The Coleopterists Bulletin (Warsaw, Poland: 1960) 59 (1), pp. 7-22 : 7-22

Diagnosis. Xenysmoderes ruficollis is distinguished from X. consularis by the

reddish prothorax wider than the latter, the elytra mottled with small patches of white

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gathering on it (arrows point toward weevils).

scales ( Fig. 3 ), the broader male aedeagus ( Fig. 25 ), and the female spermatheca with cornu strongly curved ( Fig. 33 ).

Description. Male. Body length: 2.72–3.09 mm. Length of rostrum: 1.41–1.53 mm. Maximum width across pronotum: 1.30–1.47 mm. Pronotal length: 0.95–1.06 mm. Length of pronotal process: 0.75–0.89 mm. Maximum width across elytra: 2.03–2.36 mm. Elytral length: 1.98–2.27 mm. Sutural length: 1.06–1.23 mm. Habitus as shown in Figures 3, 4 . Integument black; head, rostrum, antennae, prothorax, upper side of fore femora, fore and mid tibiae, and tarsi reddish brown; humeral parts often tinged with red.

Head generally clothed with golden-brown narrow scales and with oblong-ovate whitish ones in periphery; forehead clothed with large whitish oval scales, in addition to brownish narrow scales. Prothorax with golden-brown narrow scale directing internally; latero-ventral parts each with lanceolate whitish scales, in addition to golden-brown narrow ones, forming indistinct stripe. Elytra mottled with rather small patches formed of lanceolate white scales; each granule on intervals bearing black narrow scale, sparsely mixing with brownish ones; interval 1 with white patch of oval scales at base. Meso- and metasterna moderately covered with whitish to yellowish oblong-ovate scales. Concavity on ventrite 5 mixed with minute hair-like scales, in addition to general scaling. Pygidium clothed with blackish narrow scale, which become light-colored in periphery; lateral margin often with whitish oblong-ovate scales.

Rostrum ( Fig. 11) 1.44–1.48 times as long as pronotum. Prothorax broader, 1.36–1.40 times as wide as long; pronotal process 0.67–0.79 times as long as elytral suture. Pygidium faintly and reticulately punctured; interstices between punctures narrow, shining. Genitalia ( Figs. 25–28 ) with aedeagal body and orifice relatively broad. Otherwise practically as in X. consularis .

Female.Body length: 2.80–3.25 mm. Length of rostrum: 1.59–1.91 mm. Maximum width across pronotum: 1.30–1.56 mm. Pronotal length: 0.94–1.14 mm. Length of pronotal process: 0.73–0.92

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18 38) a scar of oviposition (arrow) and feeding traces on a bract; 39) two eggs laid inside a petal

(arrows); 40) a full-grown larva in flower bud; 41) a pupa in soil.

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Terms of Use: https://bioone.org/terms-of-use Access provided by The Coleopterists Society mm. Maximum width across elytra: 2.05–2.53 mm. Elytral length: 2.02–2.36 mm. Sutural length: 1.06–1.16 mm. Showing almost the same sexual dimorphism as in X. consularis , except spermatheca with cornu strongly curved ( Fig. 33 ).

Type Series. Holotype male (Type No. 3173, ELKU), [ TAIWAN] Hungtou , Lanhsu Is., Taitung Hsien, 30–31. iii. 1995, H. Kojima . Paratypes. 94 males and 57 females, same data as the holotype ( ELKU, TWU) ; 22 males and 14 females, same locality as the holotype, 29–31. iii. 2000, H. Yoshitake ( ELKU, TWU) .

Distribution (Map 1). This species is known to occur only on Lanhsu, a subtropical island whose fauna has been influenced strongly by that of the Philippines ( Kano 1933).

Etymology. The specific name refers to the reddish brown prothorax.

Biological Note. This species is considered to have almost the same life history as X. consularis . However, it is known to be associated only with the shell ginger, Alpinia speciosa (Wendland) Schumann , at the moment ( Fig. 42), and adults have been collected only in late March.

Figures

Figs. 1–4. Habitus of Xenysmoderes spp. 1–2) Xenysmoderes consularis, male. 1) Dorsal

Figs. 25–28. Male genitalia of Xenysmoderes ruficollis. 25) Aedeagus, dorsal view; 26)

Figs. 29–33. Female genitalia of Xenysmoderes spp. 29–30, 32) Xenysmoderes consularis.