Chrysoteuchia furva Li & Li

Li, Houhun & Li, Weichun, 2010, Four new species of the genus Chrysoteuchia Hübner (Lepidoptera: Crambidae: Crambinae) from China, Zootaxa 2485, pp. 33-46 : 38

Chrysoteuchia furva Li & Li , sp. n.

( Figs. 5 , 9 , 12 )

Type material. Holotype ɗ, China: Erlonghe, Liupanshan (35°25́N, 106°07́E), Ningxia Huizu Autonomous Region, 4.vii.1983, collector unknown, genitalia slide No. LWC08450. Paratype: 1 Ψ, Guandonggou, Kangxian (33°12́N, 105°22́E), Gansu Province, 18.vi.1992, collector unknown.

Diagnosis. This species resembles C. shafferi Li & Li , sp. n. in the wing pattern. It can be distinguished easily from the latter by the basal half of costa bearing a rectangular protuberance, the sacculus with a sclerotized nearly S-shaped pleat in distal half, and the phallus with two rows of small spinelike cornuti in the male genitalia; by the absence of the lamella vaginalis, and the corpus bursae with a rounded signum in the female genitalia. In C. shafferi , the costa lacks the protuberance, the sacculus bears a strong distal prong, and the phallus has no cornutus; the lamella postvaginalis is developed, and the corpus bursae has a peanut-shaped signum. This species is also similar to C. lolotiella ( Caradja, 1927) in the wing pattern and the female genitalia, but can be distinguished from it by the costa with dorsally straight protuberance and the phallus with two rows of cornuti in the male genitalia. While in C. lolotiella , the protuberance of costa is angled dorsally and the phallus has one row of cornuti.

Description. Adult ( Fig. 5 ): Forewing length 9.5–11.0 mm. Frons, vertex, labial palpus and maxillary palpus black. Antenna black, ciliated with white ventrally. Patagium, tegula and thorax blackish brown. Forewing blackish brown, with three black spots in medial area: first one set near upper corner of cell, second one at about middle of fold, third one at basal two fifths of dorsum; subterminal fascia represented by seven black spots evenly distributed from distal 1/5 near costa to before tornus, anterior three oblique outwards, posterior four oblique inwards; cilia blackish brown. Hindwing black; cilia with basal one third blackish brown, distal two thirds greyish white. Legs black. Abdomen black from one to six segments, the rest yellow.

Male genitalia ( Fig. 9 ): Uncus long and thin, straight, tapering to pointed apex. Gnathos about two thirds length of uncus, upcurved slightly, pointed apically. Tegumen about three times as long as gnathos. Valva broad and short, gradually narrowed towards rounded apex; costa with setose rectangular protuberance in basal half armed with sclerotized pleats, inner side of protuberance situated small thumblike process. Sacculus developed; distal half with sclerotized nearly S-shaped pleat dorsally. Pseudosaccus thumb-shaped. Saccus broad, concave at middle on anterior margin. Juxta ovate. Phallus curved slightly, shorter than valva; with two rows of small spinelike cornuti: one row comprised eight cornuti pointing to base of phallus; another row comprised ten cornuti, nine pointing to tip of phallus and one pointing to base of phallus.

Female genitalia ( Fig. 12 ): Tergite VIII nearly as long as apophysis posterioris. Antrum strongly sclerotized, much thicker than ductus bursae, gradually thickened towards ostium bursae; lateral margin of anterior part concave. Ductus bursae long and thin, nearly straight, membranous; ductus seminalis arising from posterior one fourth of ductus bursae. Corpus bursae rounded; signum small and rounded, placed at posterior one third.

Distribution. China (Gansu, Ningxia).

Etymology. The specific name is derived from the Latin furvus = dingy, in reference to the mainly blackish ground color of adult.

Figures

FIGURES 3 – 6. Adults of Chrysoteuchia spp. 3. C. rotundiprojecta sp. n., holotype, male; 4. C. nonifasciaria sp. n., paratype, female; 5. C. furva sp. n., holotype, male; 6. C. shafferi sp. n, holotype, male.

FIGURES 7 – 10. Male genitalia of Chrysoteuchia spp. 7. C. rotundiprojecta sp. n., holotype, genitalia slide No. LWC 07019; 8. C. nonifasciaria sp. n., holotype, genitalia slide No. LWC 08443; 9. C. furva sp. n., holotype, genitalia slide No. LWC 08450; 10. C. shafferi sp. n., holotype, genitalia slide No. LWC 08447 (scales: 0.5 mm).

FIGURES 11 – 13. Female genitalia of Chrysoteuchia spp. 11. C. nonifasciaria sp. n., paratype, genitalia slide No. LWC 08396; 12. C. furva sp. n., paratype, genitalia slide No. L 93005; 13. C. shafferi sp. n., paratype, genitalia slide No. L 93021 (scales: 0.5 mm).