Helcystogramma albimacularis Park & Li, 2020

Park, Kyu-Tek, Bae, Yang-Seop, Zhao, Shengnan & Li, Houhun, 2020, Thirteen new species of genera Dichomeris Hübner, 1818 and Helcystogramma Zeller, 1877 (Lepidoptera, Gelechiidae, Dichomeridinae) with twenty-one newly recorded species from Vietnam, Zootaxa 4821 (3), pp. 435-461 : 450-451

Helcystogramma albimacularis Park & Li , sp. nov.

urn:lsid:zoobank.org:act:8FFAFE04-74EA-4AD7-B1A3-469565F8467D

( Figs 31 , 47, 48 )

Type material. Holotype ♂, VIETNAM: Ninh Binh Prov.: Cuc Phuong Nat. Park , 300 m, 02 v 2005, leg. KT Park & SR Kim, gen. slide no. nklep041, in NIBR.

Description. Adult ( Fig. 31 ). Wingspan 9.5 mm. Head yellowish brown. Ocellus absent. Antenna dark brown on dorsal surface, pale yellow on ventral surface. Second segment of labial palpus dark brown on dorsal surface, pale yellow in basal half, dark brown in distal half, with rough scales; 3rd segment smoothly clothed, about equal to the length of 2nd segment. Thorax yellowish brown; tegula dark brown; mesothorax without hair pencil arising from anepisternum in male. Fore- and midleg dark brown on outer surface, yellowish white on inner surface, tibiae with yellowish white rings at middle and end respectively; hindleg dark brown on outer surface, femur yellowish white on inner surface, tibia with basal half yellowish brown, distal half blackish bown on inner surface. Forewing dark brown; markings ill-defined, with distinct discal spots; a lager rounded black one at end of cell and smaller one near middle of cell, ill-defined; postmedian line zigzagged, slightly oblique; apex more or less acute; termen slightly convex medially; fringe dark brown. Hind wing broader than forewing; deep brown.

Male genitalia ( Fig. 47 ): Uncus extremely narrow in basal 3/4, with fan-shaped apical part, about 1/2 the length of valva. Gnathos long, longer than uncus, slightly upturned, heavily sclerotized. Valva shorter than tegumen plus uncus, narrowed at base, gradually broadened toward rounded apex. Setose patch banded. Vinculum with lateral arms heavily sclerotized along margin. Saccus triangularly produced. Aedeagus broadened in basal 3/5, then narrowed, elongated, bent process apically. Eighth tergite triangular, straight on anterior margin, bluntly rounded on posterior margin ( Fig. 48 ).

Female unknown.

Distribution. Vietnam (Ninh Binh).

Diagnosis. This species superficially resembles Helcystogramma flavifuscum Li & Zhen, 2011 , but it differs from the latter by having gradually broadened valva, the cornute lateral lobe of vinculum, whereas in the latter, the valva is narrowest medially, inflated distally.

Etymology. The specific name is derived from the Latin - albus (= white) and macularis (= spot), referring to the white spot at costal 2/ 3 in the forewing.

Figures

FIGURES 31–34. Adults. 31. Helcystogramma albimacularis sp. nov., holotype, male; 32. H. flavistictum Li & Zhen, male; 33. H. imagitrijunctum Li & Zhen, male; 34. H. lutatella (Herrich-Schäffer), male. Scales = 5.0 mm.

FIGURES 47–48. Male genitalia. 47. H. albimacularis sp. nov., holotype, gen. slide no. NKLEP041; 58. Ditto, abdominal tergite VIII, Scales = 0.5 mm.