Dichomeris samkosensis Park & Li

Zhao, Shengnan, Park, Kyu-Tek, Bae, Yang-Seop & Li, Houhun, 2017, Dichomeris Hübner, 1818 (Lepidoptera, Gelechiidae, Dichomeridinae) from Cambodia, including associated Chinese species, Zootaxa 4273 (2), pp. 216-234 : 220-221

Dichomeris samkosensis Park & Li , sp. nov.

Figs 4 , 17 .

Type material. Holotype ♂, CAMBODIA: Samkos (12°14'N, 102°52'E), 10.xi.2014, leg. Y. S. Bae et al., genitalia slide No. CIS-6710 ( INU).

Diagnosis. The new species is similar to D. bifurca Li & Zheng, 1996 in the male genitalia. It can be separated from D. bifurca by having golden hair pencils arising from the mesothoracic anepisternum in the male and four rounded spots in the forewing; in the male genitalia by the uniform lateral lobes of the vinculum, the sicae edged with denticles in the distal half, and the aedeagus with three sclerotized lobes from the zone. In D. bifurca , the mesothorax has pale yellow hair pencils arising from the anepisternum in the male, the forewing has no rounded spots; the lateral lobes of the vinculum are narrowed from base to apex, the sicae are smooth, and the aedeagus has two sclerotized lobes from the zone ( Li & Zheng, 1996: 251, Figs 78, 79).

Description. Adult ( Fig. 4 ) wingspan 14.0 mm. Head yellowish brown. Ocellus absent. Antenna with scape blackish brown; flagellum yellowish brown ringed with yellow on dorsal surface, yellow and sparsely ciliate on ventral surface. Labial palpus with first and second segments blackish brown on outer surface, grey on inner surface; second segment with triangular scale tuft on dorsal surface; third segment clothed with rough scales, shorter than second, blackish brown in basal 5/6, pale yellow in distal 1/6. Thorax yellowish brown; tegula blackish brown in basal half, yellow in distal half; mesothorax with golden hair pencils arising from anepisternum in male. Forewing slightly broadened from narrow base to basal 1/3, subparallel in distal 2/3, apex protruding triangularly, termen truncate; ochreous yellow; costal margin blackish brown in basal 3/4; discal and discocellular spots blackish brown; plical spots blackish brown, placed at 1/4 and middle of fold; large parallel quadrilateral blackish brown patch along termen, its inner margin relatively straight, anterior margin oblique inward from apex to middle of vein R5; termen pale yellow; fringe ochreous yellow around apex, ochreous yellow in basal half and greyish yellow in distal half along termen, grey around tornus. Hindwing and fringe grey. Legs blackish brown on outer surface, greyish white on inner surface, tarsi with each tarsomere greyish white at apex on outer surface; hindleg with tibia clothed with long yellowish white scales.

Male genitalia ( Fig. 17 ). Uncus rounded, with two long setae near posterior margin, anterior margin deeply and broadly concave in triangle ventrally. Gnathos stout, L-shaped, curved at basal 1/3, straight in distal 2/3, sharp at apex; culcitula triangular, densely spined. Valva approximately equal to length of tegumen-uncus complex, gradually broaden from base to 2/3, uniform in distal 1/3, bluntly rounded apically; valvella about 2/7 length of valva, clavate, narrow at basal 1/3, bluntly rounded at apex, setose. Setose patch small, columnar. Vinculum height greater than length of tegumen-uncus complex, vinculum arm broad in basal half, narrow in distal half; lateral lobe broad, arising from middle of vinculum arm, about 2/5 length of valva, with length approximately 3.5 times maximum width, edged with large denticles. Saccal region narrow, slightly concave at middle anteriorly. Sicae about 2/3 length of vinculum arm, fused for short distance at base; lateral lobes narrowly banded, incurvate, concave medially on outer margin, distal half edged with denticles, with setae on ventral surface, right lobe slightly longer than left lobe. Aedeagus stout, inflated basally, slightly narrowed distally, narrowly rounded at apex; five sclerotized lobes from zone: two lateral lobes triangular, left lobe edged with denticles, about 1/5 length of aedeagus, right lobe with denticles along outer margin and on ventral surface, slightly shorter than left; three medial lobes arising from ventral surface, right lobe cornute, about 1/7 length of aedeagus, left lobe triangular, about 1/3 length of right lobe, median lobe slender, reaching apex of aedeagus.

Female unknown.

Distribution. Cambodia (Pursat).

Etymology. The species name is derived from the type locality.

Figures

FIGURES 1 – 7. Adults of Dichomeris spp. 1, D. arcuata sp. nov., holotype, male; 2, D. splendiptera, sp. nov., paratype, male; 3, D. orientis Park & Hodges, male; 4, D. samkosensis sp. nov., holotype, male; 5, D. foliforma, sp. nov., paratype, male; 6, D. fuscusitis Li & Zheng, female; 7, D. obsepta (Meyrick), male; 7 a, Male foreleg of D. obsepta (Meyrick). Scales: 1 – 7 = 5.0 mm; 7 a = 2.5 mm.

FIGURES 14 – 19. Male genitalia of Dichomeris spp. 14, D. arcuata sp. nov., holotype, genitalia slide No. 6711; 15, D. splendiptera sp. nov., paratype, genitalia slide No. 6712; 16, D. orientis Park & Hodges, genitalia slide No. 6695; 17, D. samkosensis sp. nov., holotype, genitalia slide No. 6710; 18, D. foliforma, sp. nov., paratype, genitalia slide No. ZSN 16117; 19, D. fuscusitis Li & Zheng, genitalia slide No. ZSN 15235. Scales = 0.5 mm.