Grapholita diehli Heppner & Bae, 2019

Heppner, John B. & Bae, Yang-Seop, 2019, A new Grapholita species from Sumatra, Indonesia (Lepidoptera: Tortricidae: Olethreutinae: Grapholitini), Zootaxa 4603 (3), pp. 589-591 : 589-590

Grapholita diehli Heppner & Bae , new species ( Fig. 1–3 )

Type locality: Indonesia, near Prapat , Sumatera Utara .

Diagnosis. This species is distinctive with its apical hindwing yellow patch, whereas both forewings and hindwings are otherwise mostly brown. This superficial character distinguishes it from all other congeners.

Description. Male ( Fig. 1 ). Head ( Fig. 2 ): Vertex dark brown; frons pale brown; venter tan; labial palpus brown (mesally pale tan); antenna gray with pale white ventral bristles. Thorax: Brown; patagia brown; tegulae brown, with posterior half silver; venter of thorax light tan; leg coxae dull light tan, with golden iridescence; femora same (ventrally pale tan); tibiae tan (with median tibia having tan spines), and mesally all dull white-tan; tarsi pale brown with tan segmental ends, and ventrally tan. Forewing ( Fig. 1 ) expanse 18.5 mm (n = 1); forewing dark brown, with brown-gray costa with short black strigulae (angled to tornus); scattered black spots on terminal 1/5; black-brown terminal line as fringe base; fringe gray; venter brown, with yellow patch at radial sector, terminal 1/4 with scattered tiny pale tan spots, and costal margin tan with dorsal strigulae repeated in dark brown, and pale white along dorsal margin. Hindwing ( Fig. 1 ) brown, with apical 2/5 and dorsally to mid-wing yellow, with scattered brown spots on yellow patch near apex; fringe yellow on apex and termen to mid-wing, then pale brown; venter brown with yellow apical patch repeated. Abdomen ( Fig. 1 ): Dark brown; venter gray-brown; genital tufts dark brown and tan ventrally; pregenital segment with large coremata ( Fig. 3b ). Male genitalia ( Fig. 3 ) with tegumen simple, triangular, with rounded basal ends and pedunculus; juxta triangular, with thin cucullus (subequal in length to width of juxta); valva elongated with bulbous and rounded apical third, from quadrate base and large basal cavity, with a constricted narrow central portion due to an extreme invagination of the ventral margin, and with apical portion bent ventrally; apex of valva with numerous strong spines near to terminal margin; aedeagus ( Fig. 3a ) relatively narrow, slightly curved near middle, with elongated phallobase; coremata as spinose line on distal vesica margin. Female unknown.

Specimens studied. Holotype ³, 18 km E. Prapat (H[olz]W[eg]2), 1050 m, Sumatera Utara, Indonesia, 30 Aug 1992, J. B. Heppner & E. W. Diehl (gen. slide JBH 3378 ; photo 11817) ( MGCL) (deposited at MGCL).

Etymology. The species is named in honor of the late Dr. E. W. Diehl, long-time collector and specialist of Sumatran moths.

Biology. Unknown.

Distribution. The new species is known only from northern Sumatra in the Medan region. The collecting site data used by E. W. Dielh, “HW2” [Holzweg 2, or logging road 2], refers to one of his usual collecting sites east of the town of Prapat, in mountainous areas about 100km south of Medan.

Discussion. The new species is unique among Grapholita species. Few species of Tortricidae depart from the usual monotone hindwings, or with at most the basal region pale, and these alternate maculation forms either have a light-colored hindwing overall with margins dark, or with the apical portion dark, thus, the reverse of G. diehli n. sp., which has a light apical portion ( Horak 2006, Komai 1999). It is unfortunate that only a single specimen has been discovered thus far in Sumatra, even though one of us (JBH) has surveyed the region extensively for micro-moths on several expeditions with Dr. Diehl. After 27 years, and before that, 180 years of collected, no additional specimens have bee discovered, so the species is now named in the hope that it will foster the search for more specimens, including the female.

Figures

FIGURE 1. Grapholita diehli n. sp., male holotype (18.5 mm wingspan).

FIGURE 2. Head views of Grapholita diehli n. sp., male: 2) lateral view, and 2a) dorsal view.

FIGURE 3. Grapholita diehli n. sp., male genitalia, with details: a) central features enlarged, and b) posterior of abdomen, with sternal plate and lateral scent tufts (right tuft setae removed) (gen. slide JBH 3378).