Eugauria arcuosa Chen & Wu, 2015

Wu, Zhi-Gang, Chen, Fu-Qiang & Wu, Chun-Sheng, 2015, Review of the genus Eugauria Snellen (Lepidoptera: Crambidae: Musotiminae) in China, with descriptions of two new species, Zoological Systematics 40 (4), pp. 470-475 : 472-473

Eugauria arcuosa Chen & Wu , sp. nov. ( Figs 3 , 6–7 )

Diagnosis. The species is different from others by forewing with the inner edge of the inner and larger white patch smooth. In male genitalia, the apex of the uncus is rounded, the transtilla is bifid, the broad sacculus lacks an apical harpe, and the aedeagus has a branch at the base.

Descriptions. Adults. Wing span male 13 mm, female 15 mm. Head, thorax and abdomen dark fuscous; labial palpi upturned, dark fuscous on sides, the length about 2 times of the diameter of compound eyes, the 2nd slender and the 3rd segment pointed; maxillary palpi upturned; proboscis relatively short. Forewing dark fuscous; a black spot at the upper angle of cell; a larger white patch at postmedial area, arising from costa to Cu 1, the inner edge smooth; a smaller crescent white patch at the outside of the apical yellow band; a yellow band between the white patches; cilia dark fuscous. Hindwing dark fuscous; a black spot at the middle of cell; anal angle with an incision; submarginal band with 5 connected black eye spots, the eye spots with a silvery spot centrally; cilia dark fuscous.

Male genitalia. Uncus slender, the apex rounded; gnathos slender, the length about 2/3 of uncus, the apex rounded, with dorsal teeth; tegumen with inverse V-shaped ridge dorsally; valva broaden form the base to the distal, transtilla large and bifid, sacculus broad and sclerotized, folded near the base; vinculum long; saccus large, rounded; juxta round, with the

© Zoological Systematics, 40(4): 470–475 terminal constricted; aedeagus slender and sclerotized, with a branch at the base.

Female genitalia. Anal papillae narrow, with long setae; apophysis posterioris and anterioris relatively short, apophysis anterioris swollen near the base; ositum bursae sclerotized; ductus bursae relatively short; ductus seminalis arising just below ostium bursae; corpus bursae elliptic, signa consisting of many minute spines, about 1/3 area of corpus bursae.

Holotype ♂, Hainan, Bawangling, Bureau of forestry (19.1ºN, 109.1ºE; elev. 145 m), 12 May 2007, Fu-Qiang Chen (Ny1018).

Paratypes: 1♀, Hainan, Jianfengling (18.7ºN, 108.9ºE), 13 December 1981, You-Jiong Lin (Ny1017) ; 1♂, Hainan, Ledong, Jianfengling, Chahekou (18.8 º N, 108.9 º E; elev. 206 m), 4 December 2009, Chao Yang, deposited in IZCAS .

Distribution. China (Hainan).

Etymology. The name is derived from the Latin " arcus ", corresponding to the shape of inner edge of the white patch.

Figures

Figs 2–4. Adults of Eugauria spp. (a. enlargement of forewing). 2. E. albidentata. 3. E. arcuosa Chen & Wu, sp. nov., holotype, ♂. 4. E. crenata Chen & Wu, sp. nov., holotype, ♂.

Figs 5–9. Genetalia of Eugauria spp. (a. aedeagus; b. dorsal view of apical gnathos). 5. E. albidentata, male. 6–7. E. arcuosa Chen & Wu, sp. nov., male and female. 8–9. E. crenata Chen & Wu, sp. nov., male and female. Scales bars=1mm.