Isodemis guangxiensis, Sun, Yinghui & Li, Houhun, 2011

Sun, Yinghui & Li, Houhun, 2011, Review of the genus Isodemis Diakonoff (Lepidoptera, Tortricidae) from China, with description of three new species, ZooKeys 77, pp. 51-64 : 59

Isodemis guangxiensis sp. n. Figs 816

Type material.

Holotype ♂ - China, Guangxi Zhuang Autonomous Reging: Rongshui Miao Autonomous County (25°04'N, 109°13'E), 31.VII.2003, genitalia slide no. SYH09041. Paratype: 1 ♂, Huaping Nature Reserves (23°39'N, 109°55'E), 1300 m, 1.VIII.2006, coll. Weichun Li.

Diagnosis.

This species is similar to Isodemis illiberalis both in appearance and in male genitalia, but can be separated by the median fascia extending from the costal margin to the dorsum, the subapical blotch reaching across 1/3 width of wing and the phallus having eight deciduous cornuti and two non-deciduous cornuti. In Isodemis illiberalis , the median fascia extends from below the costal fold to the dorsum, the subapical blotch reaches the tornus and the phallus has eight to twenty-three deciduous cornuti and a single non-deciduous cornutus. Isodemis guangxiensis is superficially also similar to Isodemis quadrata , the differences between them are as follows: in Isodemis guangxiensis , the uncus broadens from the basal 1/4 to the apex and the phallus bears eight deciduous cornuti and two non-deciduous cornuti, whereas in Isodemis quadrata , the uncus is quadrate and the phallus has ten deciduous cornuti and a single non-deciduous cornutus.

Description.

Adult: Male (Fig. 8) wingspan 18.0-18.5 mm. Head yellowish brown. Antenna and labial palpus ochreous brown, with scattered yellowish brown scales. Thorax and tegula dark grayish brown, sparsely mixed with yellowish brown. Forewing yellowish brown tinged with ochreous scales; costal fold densely suffused with brownish black scales, about 3/5 length of costal margin; markings brownish black mottled with ochreous: median fascia extending from costal margin to distal 2/5 of dorsum, interrupted near costal margin, with nearly oval gray patch present on its outer side posteriorly; short stripe from basal 1/4 of dorsum extending anteriorly and touching inner side of median fascia at anterior 1/3, forming an irregularly semicircular pattern above dorsum, leaving a rounded subtriangular patch of groundcolour near middle of dorsum; subapical blotch inverted triangular, from distal 1/3 of costal margin to before apex, reaching across 1/3 width of wing; with small diffusion near middle of termen; cilia yellowish brown mixed with brownish black. Hindwing and cilia grayish brown. Legs dark yellow, mottled brownish black on ventral side of foreleg and on outer side of mid- and hindlegs. Abdomen grayish brown.

Male genitalia

(Fig. 16). Uncus nearly rectangular in basal 1/4, then broadened slightly to rounded apex, densely setose in distal half. Gnathos arm slender and long; terminal plate triangular, about 2/3 length of arm. Valva slightly widened distally, length about 2 times of width, rounded terminally; transtilla irregularly round, with pointed apical process. Sacculus weakly sclerotized, protruding ventrally at middle; terminal process nearly triangular, rounded at apex, reaching plica. Vinculum somewhat concave at middle on anterior margin. Juxta large and broad, straight on anterior margin; posterior margin concave and arched, protruding posterolaterally. Phallus slightly shorter than length of valva, slightly curved and dilated in basal 2/5, with eight deciduous cornuti and two non-deciduous unequal cornuti that are about 1/3 length of phallus.

Female.

Unknown.

Distribution.

China (Guangxi).

Etymology.

The name is derived from the type locality.