Agrisius nigripunctata Bayarsaikhan, Volynkin & Bae, 2021

Bayarsaikhan, Ulziijargal, Lee, Tak-Gi, Volynkin, Anton V., Yunusbaev, Ural, Kwon, Hyung Wook & Bae, Yang-Seop, 2021, New record of Agrisius Walker (Lepidoptera, Erebidae, Arctiinae) from Cambodia with description of a new species, Zootaxa 4915 (4), pp. 567-574 : 568-572

Agrisius nigripunctata Bayarsaikhan, Volynkin & Bae , n. sp.

( Figs 1 a–c, 3a–b, 4a–b, 7a–d)

Type materials. Holotype: 1 ♂, Cambodia, Pursat Prov., Samkos , (N12˚12′38″, E102˚53′55″), 19.VII.2012 (Bae YS, Ju YD, Le XV, Park BS, Lee HJ), Gen. Slide No. INU–10238 Cambodia . Paratypes. (3 ♂, 4 f ♂) Cambodia: 1 ♂, 2 f ♂, Samkos , Pursat Prov. (N12˚12′40.43″, E102˚53′42.38″), 19–20.VII.2012 (I) (Bae YS, Ju YD, Le XV, Park BS, Lee HJ), Gen. Slide No. INU–10247, 10405, 10447 Cambodia; 1 ♂, 2 f ♂, Samkos, Pursat Prov. (N12˚12′48.1″, E102˚54′12.7″, Alt : 841m), 22–24.XII.2014 (Bae YS, Ju YD, Qi MJ, Bayarsaikhan U, Park BS, Na SM, Kim JW, Lee DJ), Gen. Slide No. INU–10237, 10241, 10444 Cambodia; 1 ♂, Bokor, Kampot Prov., (N10˚39′11″, E104˚03′11″, Alt : 950m), 26.XII.2014 (Bae YS, Ju YD, Qi MJ, Bayarsaikhan U, Park BS, Na SM, Kim JW, Lee DJ), Gen. Slide No. INU–1480 Cambodia.

Diagnosis. The new species differs from members of fuliginosus group by the light brown grayish forewing, with indistinct, fuscous brownish suffusion on veins in outer part; light hindwing with pale brown grayish costal and terminal area; in the male genitalia, uncus almost perpendicular to the tegumen, with truncated apex, which upper angle also truncated; juxta distinctly sclerotized Y–shaped; vinculum irregularly M-shaped; saccus broadly truncate; aedeagus strongly waved; in female genitalia, antrum ringed with strongly sclerotized, broad band; narrowly V–shaped, weakly sclerotized ostial plate with a bottom like proximal spur; strongly waved posterior half of ductus bursae strongly sclerotized partly, with 1–3 small spines.

Description. Adult ( Figs 1 a–c). Length of forewing 29–31 mm in male, 25–32 mm in female. Head, patagium and tegula white grayish, with rounded, black dots. In male, ground color of forewing light brown grayish, basal area paler, with 12–13 black dots of different sized and shaped; medial row of two black dots interrupted in discal cell; veins visibly darker in forewing; hindwing slightly diaphanous, whitish, with brownish suffusion at marginal area, which is fading towards anal area. In female, forewing paler than male, with more darker veins; costa with dark line at postmedial area; marginal suffusion of hindwing more concentrated at apex. Male genitalia ( Figs 3 a–c, 4a–d). Uncus bilobate, with each lobe bulbous, roundly truncate, with short, stout apical spine. Tegumen sclerotized, thick. Juxta sclerotized, narrowly Y–shaped. Vinculum weakly sclerotized, irregularly M–shaped; saccus broadly truncate. Valva membranous, strongly bent medially, apex truncate, heavily covered with setae. Aedeagus strongly curved, stout, weakly sclerotized, with one slender apical spine; vesical narrow, with one large spineshaped cornutus. Female genitalia ( Figs 7 a–d). Papillae anales broad, weakly covered with setae; VIII abdominal segments weakly sclerotized. Ostium bursae rounded; antrum ringed with strongly sclerotized, broad band; ostial plate narrowly V–shaped, weakly sclerotized, with irregularly short, triangular spur in proximal end of plate, which it looks ostium bursae’s bottom. Ductus bursae long (almost same length with corpus bursae), tubular, divided three sections: 1) posterior section strongly curved, with 1–3 small spines (figs 7b, c, d) in strongly sclerotized plate, occupies almost half of length of bursa; 2) medial section very short, narrow, weakly wrinkled, membranous, more than 3 times shorter than anterior section; 3) anterior section broadened, membranous, of almost same length as the posterior section. Corpus bursae ovoid, membranous, with two contiguous large, long (a half–length of bursae), rod–shaped signa, which each signum consists of two spiked plates.

Distribution. Cambodia (Kampot and Pursat provinces).

Etymology. The specific epithet is derived from the Latin nigre (turn black) and punctatum (spot), referring to the black spotted abdomen of adult.

Figures

FIGURES 1–2. Adults of Agrisius. 1a. A. nigripunctata n. sp., male, HT (INU-10238Cambodia). 1b. ditto, male, PT (INU- 10405Cambodia). 1c. ditto, female, PT (INU-10444Cambodia). 2a. A. fuliginosus, male (INU-10240Laos). 2b. ditto, male (INU-10235Myanmar). 2c. ditto, female (INU-10236Myanmar).

FIGURES 3–6. Male genitalia of Agrisius. 3a. A. nigripunctata n. sp., HT (INU-10238Cambodia). 3b. sternite of HT. 4a. ditto, PT (INU-10405Cambodia). 4b. sternite of PT. 5a. A. fuliginosus (INU-10240Laos). 5b. sternite. 6a. ditto (INU-10235Myanmar). 6b. sternite.

FIGURES 7–8. Female genitalia of Agrisius. 7a. A. nigripunctata n. sp., PT (INU˗10447Cambodia). 7b. Ostium bursae, antrum and first part of ductus bursae, with one spine, PT (INU˗10447Cambodia). 7c. ditto, with two spines, PT (INU˗10444Cambodia). 7d. ditto, with three spines, PT (INU˗10247Cambodia). 8a. A. fuliginosus (INU˗10236Myanmar). 8b. Ostium bursae, antrum and part of ductus bursae (INU˗10236Myanmar).