Psilalcis subconceptaria, Liu, 2024

Liu, Bo, 2024, Two new species of the genus Psilalcis Warren, 1893 (Geometridae, Ennominae, Boarmiini) from Hainan, China, ZooKeys 1190, pp. 153-162 : 153

Psilalcis subconceptaria sp. nov.

Figs 5-12 , 14 , 16 , 17 , 19-21

Type material.

Holotype: ♂, China, Hainan Province, Lingshui Li Autonomous County, Diaoluoshan, 922 m, 19.VI.2023, Bo Liu leg. (CRICATAS, will be transferred to IZCAS). Paratypes: 1 ♂, Hainan Province, Qiongzhong Li and Miao Autonomous County, Yinggeling, 496m, 3.III.2023, Bo Liu leg.; 3 ♂ 2 ♀, China, Hainan Province, Wuzhishan City, Wuzhishan, 756 m, 25.III.2023, Bo Liu leg.; 4 ♂ 10 ♀, China, Hainan Province, Lingshui Li Autonomous County, Diaoluoshan, 922 m, 20.IV.2023, Bo Liu leg. gen. prep. no. CRICATAS00147; 5 ♂ 4 ♀, China, Hainan Province, Lingshui Li Autonomous County, Diaoluoshan, 922 m, 10.V.2023, Bo Liu leg. including gen. prep. nos. CRICATAS00143, CRICATAS00146; 2 ♂ 5 ♀, China, Hainan Province, Lingshui Li Autonomous County, Diaoluoshan, 922 m, 19.VI.2023, Bo Liu leg. (CRICATAS, will be transferred to IZCAS and ZFMK)

Diagnosis.

Psilalcis subconceptaria shares a very similar wing pattern and similar trifid valve structure of the male genitalia with P. conceptaria ( Holloway [1994: 235], pl. 15: 13, figs 497, 499; Sato 1996, figs 71, 79), P. paraceptaria ( Sato 1996: 66, 67, figs 47-50, 72, 80), and P. vietnamensis ( Sato 1996: 66, figs 41-44, 73, 78; Sato 2020, pl. 25: 6, 7). It can be easily distinguished from the other three related congeners by the following genitalia characters: 1) signum located at the anterior of corpus bursae, smaller; 2) costal process elongated, longer than that of the other three relatives; and 3) apex of valve lamina slender, narrower than that of the other three relatives.

Description.

Forewing length: male 12.1-14.5 mm; female 13.3-15.0 mm. Wing pattern variable among individuals, usually more vibrant in females. Head. Antennae fasciculate, with moderately long ciliate ventrally in males; filiform in females. Frons not protruding, covered with short scales, upper half dark, lower half pale brown. Labial palpus curved upwards beyond frons, covered with long, intermingled, dark and brownish scales, third segment not extended. Vertex with lamellar, brownish scales, posterior scales erect. Chaetosemata present, small, near eye-margin. Thorax. Patagia and tegulae with lamellar, brownish and dark scales, with longer, dark brownish hair-scales on tegulae only. Prothorax ventrally covered with lamellar, brownish scales. Legs slender, yellow, chequered black, hind tibia dilated, with a yellow scent brush in males, index of spurs 0-2-4. Forewings with apex angled, termen minutely concave between vein-ends. Fovea present in males, with posterior flexure of the anal vein to accommodate it. Hindwing with apex rounded, termen moderately concave between vein-ends. Wings brownish, dotted with white and black scales. Postmedial lines of both wings punctuated, sometimes joined in lines, sinuous, black. Medial and postmedial lines of forewing converge below CuA2, then separate. Submarginal line very fine, zigzag-shaped, white, faintly visible. Marginal line black, inwardly concave. Distal band serrated, narrow, evident on forewing, only visible near tornus on hindwing. Discal dot small. Fringes colored brownish, interspersed with some black. Underside brownish-yellow, covered with dark streaks. Distal band sometimes absent or not conspicuous on hindwings. Venation. Forewing: R1 and R2 coincident; R1+R2 arising from upper vein of cell, then running close to the stem of R3-4 and R3-5; stem of R3-5 arising from anterior angle of cell; M2 from 1/4 of the discocellular vein close to M1 at base; CuA1 from before posterior angle of cell; the base of the anal vein concave downwards. Hindwing: Sc+R1 running closely parallel but not anastomosing with upper vein of cell at base; Rs from before anterior angle of cell; CuA1 from before posterior angle of cell; 3A present. Pregenital abdomen. Abdomen scaled pale brown, scattered with some black scales. Setal comb (straight field) of minute setae present on the third sternite. Tympanal organs moderately sized, without lacinia. A pair of long sterno-tympanal processes present laterally on sternite 1+2, with moderately long free end, reaching the tympanal cavity. Tergite and sternite of segment 8 strongly elongate in males, length nearly twice the width.

Male genitalia. Uncus hood-like, short, weakly curved ventrally, dorsally with short setae. Gnathos and socii absent. Juxta tongue-like, broad at base, slightly pointed at tip. Saccus rounded, slightly extended. Valvae trifid, costal process elongate, cucullus vestigial. Setose ampulla located at the centre of valve laminate lobe. Apex of sacculus bearing a long, strongly curved spine. Valve lamina membranous, distally elongated, central laminate lobe sclerotized. Aedeagus stout, apex with a curved, slender spine, vesica with a cluster of needle-like cornuti on a lateral lobe.

Female genitalia. Ovipositor slightly elongated, papillae anales narrow, covered with short setae. Anterior apophyses short, about 3/5 length of posterior apophyses. The needle-like sclerite between the bases of posterior apophyses absent. Lamella antevaginalis narrow, ribbon-shaped. Lamella postvaginalis very large, centrally triangular, distally triangularly convex at the centre, lateral processes extended, slightly curved dorsad. Posterior part of bursa much narrower than anterior part, rather short, membranous. Anterior part of bursa elongated, posteriorly projected at both sides, with sclerotized corrugations, centrally with a constriction, anteriorly bearing a pair of small, circular, opposed sclerotized patches, with three to five longitudinal ridges.

Etymology.

The specific name, Psilalcis subconceptaria , is derived from its closely related species, P. conceptaria .

Distribution.

China (Hainan).

Figures

Figures 1 - 12. Adults of Psilalcis spp. 1 - 4 Psilalcis subalbibasis sp. nov. 1 male, holotype, upperside 2 male, holotype, underside 3 female, paratype, upperside 4 female, paratype, underside 5 - 12 Psilalcis subconceptaria sp. nov. 5 male, holotype, upperside 6 male, holotype, underside 7 male, paratype, upperside 8 male, paratype, underside 9 female, paratype, upperside 10 female, paratype, underside 11 female, paratype, upperside 12 female, paratype, underside. Scale bar: 1 cm.

Figures 13, 14. Male genitalia of Psilalcis spp. 13 Psilalcis subalbibasis sp. nov. paratype, gen. prep. no. CRICATAS 00112 14 Psilalcis subconceptaria sp. nov. paratype, gen. prep. no. CRICATAS 00143. Scale bar: 1 mm.

Figures 15 - 17. Female genitalia of Psilalcis spp. 15 Psilalcis subalbibasis sp. nov. paratype, gen. prep. no. CRICATAS 00113 16 Psilalcis subconceptaria sp. nov. paratype, gen. prep. no. CRICATAS 00146 17 Psilalcis subconceptaria sp. nov. paratype, gen. prep. no. CRICATAS 00147. Scale bars: 1 mm.

Figures 18 - 21. Living specimens of Psilalcis spp. 18 Psilalcis subalbibasis sp. nov. female 19 Psilalcis subconceptaria sp. nov. male 20 Psilalcis subconceptaria sp. nov. female 21 Psilalcis subconceptaria sp. nov. female.