Genus Exoasota Ko & Bae, gen. nov.

TS: Exoasota pursatensis Ko & Bae, sp. nov. Gender: feminine.

Diagnosis. The new genus is morphologically similar to Epiparbattia Caradja, 1925 (Crambidae, Pyraustinae), but it can be distinguished from the latter by the following characters: patagium with two black orbicular spots; tegula with two black orbicular spots at middle; costal margin of forewing brown or light brown; basal area of forewing yellow, with two black orbicular spots; dorsum of forewing brown; discal cell of hindwing with a brown orbicular patch; fringe of hindwing brown; abdomen with symmetrical black, dorsal orbicular spots in each segments; in male genitalia, uncus long and pointed; valva ovoid; fibula spine-shaped, curved downwardly; juxta oblong; succus Vshaped; in female genitalia, antrum oblong, strongly sclerotized; corpus bursae cylindrical, without signum. Also, this genus is very similar to Asota Hübner, [1819] (Erebidae, Aganainae) superficially, but it can be distinguished from Asota by the following characters: vertex with a black patch; patagium and tegula with two black orbicular spots; basal area of forewing with two black orbicular spots.

Description. Head covered with yellow scales; antennae filiform; ocellus well-developed; chaetosemata absent; labial palpus upturned; maxillary palpus minute; proboscis well-developed (Fig. 1). Thorax vivid yellow. Forewing rather rhomboid and with discal spots; costal margin nearly straight; apex pointed; termen somewhat arched; dorsum straight; frenulum hook absent; female with two frenular bristles. Hindwing fan-shaped, with discal spot, postmedian fascia and adterminal line or series of patches; costal margin rather straight; termen and dorsum rounded (Figs. 4−7). Venation (Fig. 3): forewing with 13 veins: Sc free; R 1 and R 2 free; R 3 and R 4 stalked for most of length; R 2 and R 3 +R 4 approximated; R 5 free; M 1 free; M 2 and M 3 approximated at base, before lower angle of discal cell; M 3 and CuA 1 from lower angle of discal cell; 1A free; 2A forming complete loop; discal cell about 1/2 length of forewing. Hindwing with 10 veins: Sc+R 1 and Rs stalked for 2/3 length of Rs; M 1 from upper angle of discal cell; M 1 and M 2 from lower angle of discal cell; CuA 1 and CuA 2 stalked for 2/5 length of CuA 2; 1A, 2A and 3A free; discal cell about 1/3 length of hindwing. Abdomen covered with yellow scales and symmetrical black orbicular spots (Figs. 4−7). Tympanal organs well˗developed, broadly rounded, deeply concave; fornix tympani projecting in ventral direction; tympanum and conjunctivum angled; praecinctorium strongly bilobed (Figs. 2, 12). In male genitalia, uncus slender, sharpened, and setose at apex; valva oval-shaped, sclerotized at costal margin; fibula strongly sclerotized, spine-shaped; sacculus sclerotized; juxta oblong; saccus V-shaped; aedeagus cylindrical, cornuti present (Fig. 11). In female genitalia, apophyses anterior and posterior short; ostium tube-shaped, sclerotized; ductus bursae narrow, membranous; corpus bursae ovoid and signum absent (Fig. 13).

Distribution. Cambodia, Myanmar, Thailand, Vietnam.

Etymology. The generic name is a combination of the prefix Exo, derived from the Greek for “outside”, and the suffix Asota in reference to the genus Asota (Erebidae), from where species are very similar in the wing pattern. Gender is feminine.