Chrysonasma occidentis Park & Kim, 2020

Park, Kyu-Tek & Kim, Sora, 2020, Two new genera, Halista Park, gen. nov. and Mireana Park, gen. nov. and six new species of the family Lecithoceridae (Lepidoptera) from the Philippines, Zootaxa 4803 (2), pp. 316-328 : 326-327

Chrysonasma occidentis Park & Kim , sp. nov.

(Figs. 6A–G)

Type material. Holotype: ♀, Philippines, Luzon , Min Prov. Chatol, 2100 m, 16–18 xi [19]97, leg. Mey, Ebert, Nuss., gen. prep. No. CIS-6918, in MfN.

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FIGURE 6. Torodora occidentis Park & Kim , sp. nov. A, adult; B, labial palpus; C, female genitalia, prep. No. CIS-6918; D, lamella post-and ante-varginalis; E, signum; F, abdomen, G, abdominal spiniform setae. Scale bar: 0.5-1.0 mm

Diagnosis. The new species is similar to C. cassiterota ( Meyrick, 1923) which has been known from Luzon and to C. caliginosa Park & Byun from Palawan, especially in the forewing pattern, by the uniquely developed transversal blackish and yellowish fascia alternatively beyond postmedian fascia, but can be distinguished from the latter by the female genitalia: antrum weakly developed, ductus bursae narrow, long, more than 1.5 times longer than corpus bursae, whereas in C. caliginosa , the antrum large, cup-shaped, sclerotized and ductus bursae broad, less than 1.2 times longer than corpus bursae; in C. caliginosa , the ductus bursae with broad expansion medially and the corpus bursae is large and long, longer than ductus bursae.

Description. Female (Figs. 6A–B). Forewing length 9 mm.

Head: Vertex silvery brownish gray, with light-orange scales laterally. Antenna longer than forewing, about 1.3 times of forewing length; basal segment elongated, light brown all around; flagellum light orange throughout, with dark-brown annulations. Second segment of labial palpus thickened, porrected, light orange; 3rd segment slender, longer than 2 nd segment, brownish orange on outer surface, dark brown ventrally.

Thorax: Tegula and thorax dark brown dorsally. Hind tibia with brownish orange with rough scales dorsally. Forewing ground color silvery orange white, speckled with yellowish-brown scales; two transversal, light orange bands extended from base to antemedian band; antemedian band light orange, narrow, preceded by dark-fuscous scales below R vein; postmedian band light orange, arising from middle of costa, oblique, reaching 2/3 of inner margin, slightly emarginated at middle on inner side; a light-orange fascia from postmedian band on costa to near apex, well present; a silvery white zone between these above fascia; another two narrow, light orange fascia surrounded by dark-fuscous scales below M1 vein; a irregular shaped, silvery-white zone between above fascia and termen; apex more or less produced triangulary; termen emarginated before middle; fringe with light-yellow basal line and yellowish brown distally. Hindwing could not be seen by overlapped with forewing.

Abdomen (Fig. 6F–G): Spinous zones on upper surface more or less triangular.

Female genitalia (Figs. 6C–E). Eighth abdominal sternite incised medially. Apophyses anteriores long, about 3/5 of apophyses posteriores. Ostium bursae with lateral membranous flaps narrowed to acute apices. Antrum weakly developed. Ductus bursae long, about 1.5 times as long as the length of corpus bursae, nearly same width throughout; ductus seminalis arising from posterior half of ductus bursae. Corpus bursae large, elongated; signum semiovate, divided by longitudinal groove in middle, slightly concave on anterior margin medially, with dense conic spines on surface.

Male genitalia. Unknown.

Distribution. The Philippines (Palawan).

Etymology. The species name is derived from Latin, occidens (= western), referring to the distribution in the western part of the country.