Autosticha tachytoma (Meyrick,1935) Wang & Wang, 2017

Wang, Yuqi & Wang, Shuxia, 2017, Genus Autosticha Meyrick (Lepidoptera: Autostichidae) from Taiwan, China, Zoological Systematics 42 (4), pp. 508-513 : 509-511

Autosticha tachytoma (Meyrick,1935) comb. nov. ( Figs 3–5 )

Cynicocrates tachytoma Meyrick,1935: 566 . TL: China (Taiwan).

Material examined. Nantou Hueisun Exp. Forest, Taiwan, China (elev. 1100 m) , 1♂, 1♀, 22−24 April 1999, coll. W. Mey & Ebert, genitalia slide Nos. MNHU-NK 140♂, MNHU-NK 141♀ ( MNHU); Tikusiko , Taiwan, China , 1♀, 6 August 1933, coll S. Issiki, genitalia slide No. KNA-NK 179♀ ( KNA); Sozan , Taiwan, China , 1♀, 13 May 1935, coll. S. Issiki, genitalia slide No. KNA-NK15178 ♀ ( KNA) .

Diagnosis. This species is similar to A. dimochla Meyrick, 1935 superficially. It can be distinguished by the costa with basal 2/5 dorsally protruded to an elongate foliate process and the triangular sacculus; in A. dimochla , the costa has a trapezoidal process and the sacculus is beak-shaped.

Redescription. Adult ( Fig. 3 ). Wingspan 11.0−14.0 mm. Head grayish white mixed with lackish brown. Labial palpus white, second segment brown on basal half and before apex, third segment brown near base and before apex. Antenna with scape brown, flagellum brown and yellowish brown. Thorax and tegula grayish white, covered with dense grayish brown scales. Forewing creamy white, with dense blackish brown scales; costal margin with five subrounded blackish brown spots at base, at basal 1/4, at middle, beyond 3/5 and at distal 1/4 respectively; terminal dots blackish brown, ranging from distal 1/5 of costal margin along termen to tornus; discal spot subrectangular, discocellular spot rhombic, plical spot large, diffused to dorsum; fold with a small blackish brown spot at base; cilia grayish white, tinged with brown. Hindwing and cilia grayish brown. Foreleg deep brown, grayish white at apex of tibia and each tarsomere; midleg blackish brown on dorsal surface, yellowish brown on ventral surface, blackish brown at apex of tibia and distal part of each tarsomere; hindleg pale yellowish brown, tarsus deep brown distally.

Male genitalia ( Fig. 4 ). Uncus slender, longer than gnathos, pointed at apex. Gnathos narrow digitate, narrower than uncus, slightly narrowed to blunt apex; lateral arms expanded at base, approximately 1.5 times length of gnathos. Valva subrectangular, bluntly rounded at apex; costa nearly straight, reaching 3/4 length of costal margin; basal 2/5 with an elongate foliate process wider than costa, protruded distally, sinuate on dorsal margin. Sacculus sub-triangular, free distally, about 1/4 length of valva, with setae ventrally. Saccus slender, longer than uncus, blunt at apex. Juxta elongate peltate, straight anteriorly, protruded posteriorly. Aedeagus approximately same length as valva, curved, dilately basally; distal 1/3 slightly thicked, with dense spinules, with a large denticle before apex; cornuti consisting of two slender sclerites beyond distal 1/3 and a patch of spines distally.

Female genitalia ( Fig. 5 ). Pappilae anales triangular, rounded caudally, setose. Apophyses posteriores approximately 1.2 times length of apophyses anteriores. Eighth tergite broadly concave at middle on posterior margin; eighth sternite rounded on posterior margin, slightly concave on anterior margin. Ductus bursae narrow at base, slightly widened to middle, then narrowed toward corpus bursae; large sclerite at middle, about 1/4 length of ductus bursae, bearing some teeth of different size; distal half with crumples. Ductus seminalis long and thin, from before middle of ductus bursae. Corpus bursae ovate, with two densely spinuous signa: one signum small and round, situated near posterior margin of corpus bursae; another signum larger, tansversely elongate ovate, situated at posterior 1/3 of corpus bursae.

Distribution. China (Hainan, Taiwan, Zhejiang).

Notes. This species was originally described based on a female specimen. The male is described the first time here.

Figures

Figures 1–5. Autosticha spp. 1–2. A. cordiformis sp. nov. 1. Adult. 2. Male genitalia, slide No. MNHU-NK143. 3–5. A. tachytoma comb. nov. 3. Adult. 4. Male genitalia, slide No. MNHU-NK140. 5. Female genitalia, slide No. MNHU-NK141. Scale bars: 1, 3=2.0mm; 2, 4–5=0.2mm.