Ditrigona clavata, Li & Xin & Wang, 2015

Li, Yan, Xin, De-Yu & Wang, Min, 2015, A new species of the genus Ditrigona Moore, 1888 (Lepidoptera: Drepanidae) in China, Florida Entomologist 98 (2), pp. 567-569 : 567-569

Ditrigona clavata sp. nov. ( Figs. 1-7 )

DIAGNOSIS

Adults are externally close to those of D. polyobotaria ( Oberthür, 1923) , but can easily be separated by the following features: 5 transverse fasciae in the forewing, 4 transverse fasciae in the hindwing; 8th segment of abdomen strongly sclerotized, ostium arc-shaped, corpus bursae circular and without filiform structure in female genitalia.

DESCRIPTION: MALE ( FIG. 1 )

Wingspan 27 mm. Head brown, vertex white; antenna yellowish brown except dark brown at base, serrate;labial palpus blackish brown, long and stretch forwardly; proboscis strongly developed. Thorax covered with white scales. Abdomen grayish white. Forewing ground color white; costal margin smooth, brown; barely falcate at apex; subbasal fascia gray and weakly marked; antemedial fascia light color and broad; medial fascia dark color and rather broad; postmedial fascia dark color,

1 Department of Entomology, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China

2 Guangxi General Station for Plant Protection, Nanning 530022, Guangxi, China broad and slight excurved in middle; subterminal fascia slender,grayish brown; cilia short, grayish white. Hindwing ground color white; subbasal fascia unmarked; antemedial and medial fasciae nearly as same as forewing’s, but postmedial fascia broader than forewing’s, strongly excurved in middle; subterminal fascia same as forewing’s; outer margin cilia short, grayish white; inner margin cilia long, white.

MALE GENITALIA ( FIGS. 3-6 )

Uncus bifurcated at base, 1/2 times as long as tegument, each fork medium-long, slender at apex, broad at base; tegumen wide and arc-shaped, socii broad and wide, incurved at apex and strongly setose, shorter than uncus; gnathos degenerated; 1 pulvinus between tegument and valva, finger-shaped protuberance at pulvini; valva clavate, wide and thick at base; cucullus thin and long, strongly sclerotized; juxta similar triangle-shaped; saccus medium-long and thin. Aedeagus medium-long, horn-shaped, pointed at extremity; coecum broad and long, similar rectangle, weakly sclerotized, 1/3 times as long as aedeagus; vesica without cornuti. 8th tergite without octaval, weakly sclerotized; 8th sternite with octavals, strongly sclerotized.

DESCRIPTION: FEMALE ( FIG. 2 )

Wingspan 31 mm. Head brown, vertex white; antenna dark brown, serrate; labial palpus blackish brown, long and stretch forwardly. Thorax covered with white scales. Abdomen grayish white. Forewing ground color white; costal margin smooth, dark brown; barely falcated at apex; subbasal fascia gray and weakly marked; antemedial fascia light color and broad; medial fascia dark color and very broad; postmedial fascia dark color, broad and slight excurved in middle; subterminal fascia slender,; cilia medium-long, dark gray. Hindwing ground color white; subbasal fascia unmarked; antemedial fascia slender and light brown; medial fasciae broad,grayish brown; postmedial fascia broad,grayish brown and strongly excurved in middle; outer margin cilia medium-long,dark gray; inner margin cilia long, white.

FEMALE GENITALIA ( FIG. 7 )

Anal papillae broad; 8th segment of abdomen strongly sclerotized; anterior and posterior apophyses absent; ostium arc-shaped; ductus bursae broad and short; corpus bursae large, circular and with a leafshaped sclerotized signum.

TYPE MATERIAL

HOLOTYPE. Male, CHINA, Guangxi province, Mao’ershan National Nature Reserve , 1-VII-2003, leg. Min Wang and Guo-hua Huang. Para- types. 1 male, China, Guangdong province, Nanling National Nature Reserve , 7-VIII-2003, leg. Liu-sheng Chen and Hong Lin ; 1 female, locality same as paratype, 7-V-2009, leg. Min Wang ; 1 female, locality same as paratype, 2-VII-2012,leg. Hai-ming Xu ; 1 male, locality same as paratype, 13-VII-2013, leg. Hai-ming Xu, Lan-lan Huang & Feng-ying Yang.

DISTRIBUTION

China (Guangxi and Guangdong Provinces) .

Etymology

The specific name is derived from the character of valva.

To assign the new species, D. clavata sp. nov., the key to the species-group D. triangularia proposed by Wilkinson (1968) is modified as follows:

Couplets 1-6 without change.

7. Wings with 4 transverse fasciae. Straight subterminal and subbasal fascia present.............................................. 8 —. Wings with 2 distinct transverse fasciae. No straight subterminal and subbasal fasciae..................... D. fasciata Hampson, 1893

8. Ostium slit-like, corpus bursae oval-shaped and with filiform structure in female genitalia............. D. polyobotaria ( Oberthür, 1923) —. Ostium arc-shaped, corpus bursae circular and without filiform structure in female genitalia........... D. clavata Li, Xin & Wang sp. nov.

Figures

Figs. 1-7. Ditrigona clavata sp. nov. 1. Male, holotype; 2. Female, Paratype. 3. Male genitalia; 4. Aedeagus; 5. 8th tergite; 6. 8th sternite; 7. Female genitalia.