Chrysoteuchia landryi, Jie, Lu-Lan, Yang, Jing-Bo & Li, Wei-Chun, 2019

Jie, Lu-Lan, Yang, Jing-Bo & Li, Wei-Chun, 2019, The geographical distribution patterns of Chrysoteuchia Hu ̈ bner in China and description of a new species (Lepidoptera, Crambidae), ZooKeys 853, pp. 109-118 : 112-113

Chrysoteuchia landryi sp. nov. Figs 3-7

Type material.

Holotype ♂: CHINA: the foot of Galongla Snow Mountain (29°44.29'N, 95°40.61'E), Mêdog, Tibet, 3415 m, 22.vii.2014, Wei-Chun Li leg., genital prep. no. LW15049 (JXAUM).

Paratypes: 2 ♂♂, 2 ♀♀, same data as the holotype, genital prep. nos. LW15007, LW15059 (JXAUM).

Differential diagnosis.

This new species is similar to Chrysoteuchia picturatella (South, 1901), C. gonoxes (Bleszynski, 1962), and C. dentatella Song & Chen, 2001 in having an apical prong on the sacculus and a well-developed apical spine on the phallus in the male genitalia. In female genitalia, it also resembles the above three species in having two lateral spines on the posterior margins of the lamella postvaginalis, and double signa on the corpus bursae. However, the new species can be easily distinguished by lacking fasciae on the forewing (Fig. 5), the presence of a crescent-shaped protuberance on the costa of the valva in male genitalia (Fig. 6), and the female antrum ending with two small triangular projections on the lateral margins (Fig. 7). In the latter three species, the forewing fasciae are well developed, the costa of the valva is armed with spine-like projections, and the antrum is without distal spines ( Bleszynski 1965; Song and Chen 2001).

Description.

Adult (Figs 3-5): Forewing length 11.0-13.0 mm. Frons white mixed with pale brown. Vertex white. Labial palpus approximately twice as long as compound eye diameter, pale brown on outer side, white on dorsal and inner sides. Maxillary palpus white, basally pale brown. Antenna scapus white mixed with pale brown; flagellomere blackish brown. Patagium and tegula pale brown. Thorax blackish brown. Forewing densely covered with brown scales, apex suffused with black and white scales; termen of apex black, four terminal black dots running from middle of termen to tornus; cilia pale brown. Hindwing greyish white, suffused with pale brown scales around apex and along veins; cilia greyish white.

Male genitalia (Fig. 6): Uncus thin and long, tapering to blunt apex, tip slightly curved downward on lateral view. Gnathos straight, a bit shorter than uncus, tapering to point tip. Tegumen approximately twice as long as gnathos, with broad dorsal bridge. Valva broad at basal half, distal half narrowing towards apex, apex rounded. Costa with crescent-shaped protuberance near base, basal half strongly sclerotised and gently convex, concave near middle. Sacculus basally narrow, broadened towards distal prong; distal prong nearly triangular, tip pointed and reaching costa. Juxta ovate. Saccus broad, concave at middle of distal margin. Phallus slightly shorter than valva, apical spine well-developed, ending with triangular prong; cornutus absent.

Female genitalia (Fig. 7): Papillae anales broad, concave on posterior margin. Tergite VIII coalescing with antrum. Lamella postvaginalis developed, slightly broader than antrum, medially convex, posterolaterally with long spine. Antrum strongly sclerotised, approximately three times as thick as median part of ductus bursae, ending with two small triangular projections at lateral sides. Ductus bursae long and thin, membranous; ductus seminalis arising from posterior one fourth of ductus bursae. Corpus bursae ovate; signa double, oblong and lotus flower-shaped, consisted of tiny spines with various sizes.

Distribution.

Currently only found at Galongla Snow Mountain, in Mêdog County, Tibet of China.

Natural history.

Unknown except that the moths are in flight in late July and come at light. The habitat of this species is identical to that of Metaeuchromius glacialis Li, 2015 and Scoparia spp., collected at the foot of Galongla Snow Mountain. Most parts of the mountain are covered with snow; the vegetation at the bottom is a blend of alpine meadows, shrubs, and conifers on the south slope ( Li and Liu 2015; Li et al. 2016).

Etymology.

In honour of Dr Bernard Landry, who contributed profoundly to systematic research on the subfamily Crambinae, and who substantially contributes to the catalogue of the world Crambinae species in GlobIZ (www.pyraloidea.org).