Argyresthia (Argyresthia) umbrina, Liu, Tengteng, Wang, Shuxia & Li, Houhun, 2017

Liu, Tengteng, Wang, Shuxia & Li, Houhun, 2017, Review of the genus Argyresthia Hübner, [1825] (Lepidoptera: Yponomeutoidea: Argyresthiidae) from China, with descriptions of forty-three new species, Zootaxa 4292 (1), pp. 1-135 : 60-61

49. Argyresthia (Argyresthia) umbrina , sp. nov. ( Figs. 61 , 127 , 183, 239 , 285 )

Description. Adult ( Fig. 61 ) wingspan 9.0̄ 11 mm. Head white, face tinged with yellow laterally. Labial palpus white, tinged with yellow laterally. Antenna with scape white, pecten yellow; flagellum white, ringed with black. Foreleg with femur gray on inner surface, tibia and tarsus black on inner surface, tibia dotted with black near base, at middle, and distally laterally, each tarsomere black distally on outer surface, remainder white; midleg mostly white, tibia with four, evenly spaced, black dots dorsally, each tarsomere black distally; hindleg mostly grayish fuscous, each tarsomere blackish gray distally. Thorax white, orange yellow laterally; tegula golden orange. Forewing ratio 4.0; yellowish brown, with dense transverse fuscous striae except on basal 1/5; costa with dark fuscous striae on basal 2/3, alternating with pale yellow, yellow dot at distal 1/5 sometimes absent; dorsum white along basal 1/5 of wing or white only at base; cilia concolorous with adjacent wing pattern on costa and around apex, yellowish gray near tornus. Hindwing and cilia uniformly gray. Abdomen dark gray dorsally, yellowish white ventrally.

Male genitalia ( Figs. 127 , 183, 239 ): Tuba analis slightly shorter than width of valva. Socius covered with 19̄21 scale-like setae, bearing two setae posteriorly ( Fig. 239 ). Gnathos not inflated distally, without long thick setae apically. Valva subelliptical, widest at middle, dorsal margin slightly arched at basal 2/5; with a clump of long thick setae in disc. Saccus shorter than width of valva, triangular, blunt apically. Phallus nearly straight, 4.0 times as long as width of valva ( Fig. 183). Second sternite with about eight micro-setae in each row; eighth sternite Yshaped. Coremata present.

Female genitalia ( Fig. 285 ): Ovipositor 2.5 times as long as eighth segment. Anterior apophysis 4/5 length of posterior apophysis, bifurcate before middle, with branches reaching middle but not joined. Lamella postvaginalis nearly rectangular. Antrum funnel-shaped, 5/7 length of eighth segment. Ductus bursae spinulate near and before opening of ductus seminalis and near corpus bursae; ductus seminalis originating from anterior 2/5 of ductus bursae. Corpus bursae round, densely denticulated, sparser anteriorly; signum with basal plate large, conical, horns curved inward, C-shaped.

Type material. CHINA: Holotype, Ƌ, Mt. Mian , Jiexiu County, Shanxi Province (36.87°N, 111.99°E), 1370 m, 20.vii.2014, leg. Tengteng Liu, Meiqing Yang and Sihan Lu. Paratypes: 2Ƌ, 3♀, same data as holotype, except 15, 18̄ 20.vii.2014, slide nos . LTT12546♂, LTT12547♀, LTT12721W; 2♂, Mt. Baxian (40.18°N, 117.55°E), Ji County, Tianjin, 550 m, 23, 24.vi.2001, leg. Houhun Li et al., slide no . LTT12124; 1♀, Qiuqianjia Forest Station (35.39°N, 106.35°E), Qiuqianjia Forest Farm, Mt. Liupan , Ningxia Hui Autonomous Region, 1700 m, 2.vii.2008, leg. Shulian Hao and Zhiwei Zhang, slide no . LTT12045.

Other material: 1Ƌ (without abdomen), Mt. Baxian (40.18°N, 117.55°E), Ji County, Tianjin, 560 m, 14.vii.2005, leg. Houhun Li et al. ; 1♂ (without abdomen), Dakezhuang Village (40.48°N, 115.85°E), Mt. Song , Beijing, 13.vii.2010, Aihuan Zhang and Zheng Li.

Distribution. China (Beijing, Ningxia, Shanxi, Tianjin).

Diagnosis. Argyresthia (A.) umbrina resembles A. (A.) semitestacella (Curtis, 1833) and A. (A.) umbrinistrigata , sp. nov., in forewing pattern. It can be distinguished from the latter species by the dorsum having the basal 1/5 (or only the extreme base) white and lacking a dark streak or spot before the middle of the wing. In A. (A.) semitestacella , the dorsum is white on the basal 2/5 and has a dark brown spot before middle of the wing. In A. (A.) umbrinistrigata , sp. nov., the dorsum is white at the base and has an oblique dark brown streak before the middle of the wing. In the male genitalia of Argyresthia (A.) umbrina , the socius bears two setae posteriorly, and the subelliptical valva is widest at the middle. In A. (A.) umbrinistrigata , sp. nov., the socius bears a single seta posteriorly, and the valva is widest at the basal 1/3. In the female genitalia, the branch of the anterior apophysis reaches the middle of the eighth segment, and the horns of the signum are C-shaped in A. (A.) umbrina , sp. nov. The branch of the anterior apophysis does not reach middle of the eighth segment, and the horns of the signum are water caltrop-shaped in A. (A.) semitestacella .

Etymology. The specific name is derived from the Latin umbrinus, meaning brown, referring to the yellowishbrown forewing.

Figures

FIGURES 60 – 67. Adults of Argyresthia spp. 60, A. (Argyresthia) longalbella, sp. nov., ♂, holotype; 61, A. (A.) umbrina, sp. nov., ♀, paratype; 62, A. (A.) umbrinistrigata, sp. nov., ♀, paratype; 63, A. (A.) angusta Moriuti, ♀; 64, A. (A.) surrecta, sp. nov., ♂, holotype; 65, A. (A.) lanosa, sp. nov., ♂, holotype; 66, A. (A.) lata, sp. nov., ♀, paratype; 67, A. (A.) alpha Friese & Moriuti, ♀. (Scales = 2.0 mm)

FIGURES 126 – 131. Eighth sternite and male genitalia excluding phallus of Argyresthia spp. 126, A. (Argyresthia) longalbella, sp. nov., slide no. LTT 12274, paratype; 127, A. (A.) umbrina, sp. nov., slide no. LTT 12546, paratype; 128, A. (A.) umbrinistrigata, sp. nov., slide no. LTT 12526, paratype; 129, A. (A.) angusta Moriuti, slide no. LTT 12289; 130, A. (A.) surrecta, sp. nov., slide no. LTT 12357, paratype; 131, A. (A.) lanosa, sp. nov., slide no. LTT 12664, paratype. (Scales = 0.2 mm)

FIGURES 233 – 244. Socii of Argyresthia spp. 233, A. (Argyresthia) pygmaeella ([Denis & Schiffermüller]), slide no. LTT 12722; 234, A. (A.) brockeella (Hübner), slide no. LTT 12548; 235, A. (A.) ivella (Haworth), slide no. LTT 12270; 236, A. (A.) basistriata, sp. nov., slide no. LTT 12271, paratype; 237, A. (A.) retinella Zeller, slide no. LTT 12717; 238, A. (A.) longalbella, sp. nov., slide no. LTT 12274, paratype; 239, A. (A.) umbrina, sp. nov., slide no. LTT 12546, paratype; 240, A. (A.) umbrinistrigata, sp. nov., slide no. LTT 12526, paratype; 241, A. (A.) angusta Moriuti, slide no. LTT 12289; 242, A. (A.) surrecta, sp. nov., slide no. LTT 12357, paratype; 243, A. (A.) lanosa, sp. nov., slide no. LTT 12664, paratype; 244, A. (A.) lata, sp. nov., slide no. LTT 12279, paratype. (Scales = 0.1 mm)

FIGURES 283 – 285. Female genitalia of Argyresthia spp. 283, A. (Argyresthia) retinella Zeller, slide no. LTT 12224; 284, A. (A.) longalbella, sp. nov., slide no. LTT 12276, paratype; 285, A. (A.) umbrina, sp. nov., slide no. LTT 12547, paratype. (Scales = 0.5 mm)