Rhynchina taibaishana Han

Zheng, Hong & Han, Hui-Lin, 2018, A new species of genus Rhynchina Guenee, 1854 from Mt Taibai, China (Lepidoptera, Erebidae, Hypeninae), ZooKeys 811, pp. 1-8 : 2-6

Rhynchina taibaishana Han sp. n. Figures 1-3, 7, 11, 14, 15

Holotype.

♂, China, Shaanxi Province, Mt Taibai, Haoping, 2-10.V.2010, leg. TY. Shao, XW. Liu [NEFU], genit. prep. hhl-2125-1.

Paratypes.

1♂, 1♀, same data as holotype [NEFU], genit. prep. hhl-2124-1 (♂), hhl-3817-2 (♀).

Diagnosis.

The adult of the new species is similar to R. deqinensis Han, 2008 (Fig. 4) and R. helga Gaal, 1998 (Fig. 5), but the forewing apex of R. taibaishana is sharper than that in R. deqinensis and R. helga . The postmedial line of R. taibaishana undulates more obviously, and bends strongly at CuA2, but that of R. deqinensis and R. helga is smooth. The terminal line is strongly serrated in R. taibaishana , but in R. deqinensis and R. helga it is rather smooth. The orbicular spot of R. taibaishana is small, black and indistinct in some specimens, while in R. deqinensis and R. helga it consists of fine black speckles. In the male genitalia, the costal process of R. taibaishana (Fig. 7) is stout and extends over 1/3 the length of valva, but in R. deqinensis (Fig. 8) and R. helga (Fig. 9) the costal pro cess is very short or small and indistinct. The claspers of R. taibaishana are asymmetrical and finger-like, the left one twice as long as the right one, but in R. deqinensis they are symmetrical, curved and finger-like, and in R. helga , also symmetrical but spine-like. The ampulla in R. taibaishanna is short and slightly curved, reaching to the costal margin in the right valva, while that of left valva is somewhat shorter; in R. deqinensis and R. helga , the ampulla extends along the main axis of valva, while that of R. helga is sharp apically and slightly curved. The cornutus of R. taibaishana is shorter than that of R. helga , and longer than in R. deqinensis . In the female genitalia, the corpus bursae of R. taibaishana (Fig. 11) is long, oval shaped, its posterior 3/4 sclerotized and bearing a strongly extended sclerotized signum, but the corpus bursae of R. helga (Fig. 12) is longer, slightly constricted and bent at the middle and membranous throughout and without a signum, but with large ridged appendix bursae, which is absent in R. taibaishana .

Externally R. taibaishana is also similar to R. mandarinalis Leech, 1900 (Fig. 6), but it differs by the continuous yellow-brown oblique band runing from the apex to the basal part of forewing. In R. mandarinalis the forewing shows apical and basal yellowish brown patches, which are connected by a thin, yellowish brown-bordered blackish line. In the male genitalia, the valva of R. taibaishan shows parallel costal and ventral margin up to the cucullus, while the valva of R. mandarinalis (Fig. 10) is apically tapered. The costa of R. taibaishan is strongly developed, while in R. mandarinalis it is not expressed. These two species are especially different in the female genitalia (Figs 11, 13), particurlarly in the shape of corpus bursae, which is long-ovoid and sclerotized in the posterior 3/4 in R. taibaishana , but broader and pear-shaped, membranous, and bearing small surface granulation in R. mandarinalis (Fig. 13). Both species have a strongly sclerotized, outwardly extended finger-like signum on posterior part.

Description.

Adult (Figs 1-3). Wingspan 26-29 mm. Head, thorax and abdomen pale yellowish brown with grey scales. Male antenna ciliate. Labial palpi long, upcurved. Forewing yellowish brown, with dark brown and some black suffusion; basal line dark brown, short, arched, feebly distinct; antemedial line black, strongly waved at veins 1A+2A, and distinct only at costal and inner margins; postmedial line double, black, its outer border indistinct at anterior 1/2 and distinct at posterior 1/2 inner border well distinct on costal area, then greatly outwardly produced beyond discal cell, albeit fading in correspondence to pale oblique band bisecting apical area, then slightly undulated and internally oblique to inner margin; subterminal line yellow, a jagged wave, distinct from M1 to inner margin, with sharp angle between CuA2 and 1A+2A; pale yellowish brown oblique band crosses wing from apex to base; orbicular spot small, dark brown, indistinct; reniform spot dark brown, obscure; tornus extended out with tuft of grayish brown scales; interspaces M1-M2, M2-M3 and M3-CuA1 crossed with a black streak each; costal, adterminal and tornal fields blackish grey; terminal line black; fringe chequered yellowish brown and smoky black, with paler basal dots between the veins. Hindwing light yellowish brown, irrorated with dark brown scales; terminal line thin, black; fringe yellow and black.

Male genitalia.

(Fig. 7) Tegumen broad, oblong, 4/5 as long as vinculum. Vinculum V-shaped. Valva narrow, bar-like, elongated; costal process flat, stout, sclerotized and blunt, swollen medially, not reaching middle part of valva; sacculus rather swollen, sclerotized; clasper and ampulla fused, heavily sclerotized, asymmetrical; ampulla short and slightly curved, reaching costal margin on right valva, slightly shorter on left valva; left clasper twice as long as right one, narrow, finely pointed, right one stubby. Uncus long and narrow, bent subbasally, sickle shaped, apical part hooked. Juxta inverted funnel-shaped, sclerotized. Aedeagus long, cylindrical, straight, tapered apically, carina broad, sclerotized; vesica membranous, with broad irregular-shaped basal part, small sack-shaped basal diverticulum, and very long, cylindrical medial diverticulum, armed with long thin apical cornutus connected basally to the vesical membrane for half of its length.

Female genitalia.

(Fig. 11) Ostium bursae wider than ductus bursae; antrum cylindrical, sclerotized, slightly curved, and constricted proximally, its dorsal part with a liguliform process, about 1/2 as long as remainder of antrum; ductus bursae very short, about 1/2 length of antrum, sclerotized, joined to this by narrow membranous tract; corpus bursae elongated, ovoid, sclerotized posteriorly for 3/4 of its length, bearing in caudal part strong sclerotized, outwardly extended thumb-like signum, with broad horn-shaped base. Apophyses anteriores very short, broad basally; apophyses posteriors relatively long, about 5 times longer than anteriores; papillae anales elongate, broad.

Distribution.

(Fig. 14) China (Shaanxi Province: Mt Taibai).

Etymology.

The species name " taibaishana " refers to the type locality, Mt Taibai.

Bionomics.

(Fig. 15) The species was collected in a broad-leaved forest with shrubs. All individuals have been attracted at ultra violet light in May 2010.