Frisilia basistricta, Yu & Wang, 2021

Yu, Shuai & Wang, Shuxia, 2021, Three new species and one newly recorded species of genus Frisilia Walker (Lepidoptera, Lecithoceridae) from China, with a checklist of the world, Zootaxa 4926 (1), pp. 65-78 : 68

Frisilia basistricta sp. nov.

( Figs 6 , 10, 14 , 17 , 21 )

urn:lsid:zoobank.org:act:96526F9D-0E1D-49DB-BF04-E2AB186B52BC

Type material. CHINA, Yunnan: Holotype ³, Gaoligong (27°42′N, 98°16′E), Nujiang , 380 m, 1. VI.2017, leg. KJ Teng et al., slide No. YS 20011 . Paratypes: 3³ 19♀, same data as holotype except dated 28.V‒1. VI.2017, slide Nos. YS 20012 ♀ , YS20016³, YS20017³, YS20020 ♀.

Diagnosis. The new species is similar to F. motuoensis sp. nov. and F. trisigna sp. nov. superficially. It can be distinguished in the male genitalia by the cucullus lacking a process at the ventrobasal corner, and the juxta lacking processes on the posterior margin; in the latter two species, the cucullus has a ventrobasal process, and the juxta has a pair of processes on the posterior margin. This species is also similar to F. homochlora Meyrick, 1910 in the female genitalia, but can be separated by the termen of the forewing concave below the apex and the presence of vein R 4; in F. homochlora , the termen of the forewing is straight, and R 4 is absent in the forewing ( Meyrick 1910a: 437).

Description. Adult ( Figs 6 , 10, 14 ). Wingspan 18.0‒19.0 mm.

Head: pale yellow, tinged with brownish yellow. Antenna pale yellow; scape yellowish brown on posterior margin, with a tuft of yellowish-brown scales at base dorsally; flagellum yellowish brown at base on posterior margin, ringed with brown but basally indistinct. Labial palpus in male orange white mixed with yellowish brown, greyish black apically; in female second palpomere orange white on inner surface, yellowish brown on outer surface, third palpomere dark brown.

Thorax: Thorax and tegula yellowish brown. Forewing with costal margin slightly arched, apex obtusely produced, termen concave below apex; ground color pale yellow, mixed with sparse yellowish-brown and blackishbrown scales, yellowish brown on tornal area; discal and discocellular stigmata blackish brown; subdorsal groove in male covered with yellowish-brown scales, brush-like in basal 1/3; termen with a narrow dark brown band; fringe yellowish brown; R 5 to termen, R 5 stalked with R 4, R 4+5 stalked with R 3, M 1 close to R 3+4+5 at base, M 2 present, M 3 and CuA 1+2 arising from same point; CuA 1 and CuA 2 coincident. Hindwing and fringe grey; M 2 and M 3 +CuA 1 parallel, M 3 and CuA 1 coincident. Legs pale yellow dorsally, dark brown ventrally.

Male genitalia ( Fig. 17 ). Uncus broad V-shaped; caudal lobe triangular, extending obliquely outward. Gnathos with basal plate roundly produced posteriorly; median process wide at base, narrowed to basal 3/5, abruptly slender from distal 2/5 to a pointed apex, bent ventrad at distal 2/5 at a right angle. Valva broad basally, narrowed to cucullus; cucullus shrunken subbasally, elliptical in distal 3/5, setose; costal bar narrow, produced at middle dorsally; sacculus wide in basal half, tapered toward cucullus in distal half. Vinculum nearly straight on anterior margin. Juxta shield-shaped, notched at middle on posterior margin, obtusely produced at middle on anterior margin; posterolateral lobe triangular, extending obliquely outward. Aedeagus as long as valva, almost tubular, slightly arched; cornuti consisting of a large horn with a basal plate placed near base, and a weakly sclerotized plate about 1/3 length of aedeagus placed before middle.

Female genitalia ( Fig. 21 ). Eighth abdominal sternite concave at middle on posterior margin. Apophyses posteriores about twice length of apophyses anteriores. Antrum short, wider than long, spiculose ( Fig. 21a ). Ductus bursae narrowed posteriorly, widened toward corpus bursae, with some conic spines near base of ductus seminalis; ductus seminalis arising from corpus bursae posteriorly, much slender, with dense spinules on inner wall ( Fig. 21b ). Corpus bursae elliptical; signum horizontally elongate elliptical, densely denticulate, placed anteriorly.

Distribution. China (Yunnan).

Etymology. The specific epithet is derived from the Latin bas- and strictus, referring to the cucullus shrunken subbasally in the male genitalia.

Figures

FIGURES 6‒9. Male adults of Frisilia spp. (dorsal view). 6. F. basistricta sp. nov., holotype; 7. F. sulcata, slide No. YS20008; 8. F. motuoensis sp. nov., paratype, slide No. YS20006; 9. F. trisigna sp. nov., holotype. Scale bars = 2.0 mm.

FIGURES 10‒16. Labial palpi and wing venations of Frisilia spp. 10‒13. Male labial palpi. 10. F. basistricta sp. nov., slide No. YS20016; 11. F. sulcata, slide No. YS19469; 12. F. motuoensis sp. nov., slide No. YS20010; 13. F. trisigna sp. nov., slide No. YS20019; 14‒16. Wing venations. 14. F. basistricta sp. nov., ³, slide No. YS20016; 15. F. motuoensis sp. nov., ♀, slide No. YS20007; 16. F. trisigna sp. nov., ³, slide No. YS20019. All paratypes except F. sulcata. Scale bars: 10‒13 = 0.5 mm, 14‒16 = 2.0 mm.

FIGURES 17‒20. Male genitalia of Frisilia spp. 17. F. basistricta sp. nov., paratype, slide No. YS20016; 18. F. sulcata, slide No. YS20008; 19. F. motuoensis sp. nov., holotype, slide No. YS20013; 20. F. trisigna sp. nov., holotype, slide No. YS19065. Scale bars = 0.5 mm.

FIGURES 21‒23. Female genitalia of Frisilia spp. 21. F. basistricta sp. nov., slide No. YS20012; 22. F. motuoensis sp. nov., slide No. YS20007; 23. F. trisigna sp. nov., slide No. YS20018; 21a‒23a. Enlarged antrum; 21b‒22b. Enlarged ductus semina- lis; 23b. Enlarged signa, slide No. YS20015. All paratypes. Scale bars = 0.5 mm.