A new species of Crambus Fabricius, 1798 from China (Lepidoptera: Crambidae)

Crambus duospineus Li, sp. n. is described from Jiangxi Province, China. The new species can be diagnosed by the sacculus of male genitalia with a strongly sclerotized apex, ending with two spine-like projections, and the well-developed apical spine of the phallus is approximate half as long as the phallus. Images of the head, habitus, and male genitalia of Crambus bipartellus South, 1901 are provided for comparison.


Introduction
The genus Crambus was erected by Fabricius in 1798(FABRICIUS, 1798), and its type species Phalaena pascuella Linnaeus, 1758 was subsequently designated by CURTIS (1826).Most members of the genus have a white longitudinal stripe on the forewing that extends from the base to the apex of the discal cell or to the termen.In species delimitation, the male genitalia provide significant characters, especially the structures of the valva (costa, sacculus) and cornuti in the phallus.To date, the genus has 167 species worldwide and occurs in each biogeographical region (NUSS et al., 2020).Before this study, twenty-one species has been recorded in China (BLESZYNSKI & COLLINS, 1962;BLESZYNSKI, 1965;CHEN et al., 2005).In the present paper, a new species of the genus is added from China.All the specimens studied are deposited in the Insect Museum, Jiangxi Agricultural University, Nanchang, China (JXAUM).SHILAP Revta. lepid.,48 (192) diciembre 2020: 603-607 eISSN: 2340-4078 ISSN: 0300-5267
Male genitalia (Figs 3-4): Uncus thin and long, tapering to point apex.Gnathos slightly longer than uncus, curved downward near apex, distally blunt.Tegumen as long as gnathos, with broad dorsal bridge.Valva gently broadened towards rounded apex.Sacculus well-developed, concave near middle, with distal one fourth gently broadened; apex strongly sclerotized, adorned with a spine-like projection on dorsal and ventral margin.Saccus broad, with concave distal margin medially.Phallus slightly shorter than valva, ventral wall with thickly sclerotized, slightly curved thin rod in apical half.
Diagnosis: The new species (Fig. 1) is similar in forewing pattern to Crambus bipartellus South, 1901 (Fig. 5), but it can be distinguished from the latter by the two spine-like projections at the apex of sacculus (Fig. 3b) and the phallus with the wall forming a thickly sclerotized thin rod in its apical half (Fig. 4b).In C. bipartellus, the sacculus has a single apical projection (Fig. 6) and the phallus is without apical spine but has two spine-like cornuti (Fig. 7).
Natural history: Unknown except that the moths fly near middle of September.The habitat in which this species has been collected is located at an altitude of 1800 m, on the south slop of Mount Wugong; and the vegetation at the collecting locality consists of Miscanthus sp.(Poaeceae).
Etymology: The specific name is derived from the Latin prefix duo-= double and the Latin spineus = spinous, in reference to the sacculus ending with two apical spines in male genitalia.