Doryscus krausi, Lee, Chi-Feng, 2017

Lee, Chi-Feng, 2017, Revision of the genus Doryscus Jacoby (Coleoptera: Chrysomelidae: Galerucinae), Zootaxa 4269 (1), pp. 1-43 : 12-14

Doryscus krausi sp. nov. ( Figs 4 B, 6)

Types (n= 2). Holotype ♂ ( NHMB): LAOS. Houa Phan prov. : Phou Pane Mt., 20°13’09–19” N 103°59’54” – 104°00’03”E, 1480–1550 m, 1.–16.V.2009, leg. Z. Kraus. Paratypes: THAILAND. 1♂ ( SEHU), Chiangmai prov. : Doi Pui, 27.V.1983, leg. S. Ohmomo.

Description. Length 4.0 mm, width 1.5 mm. General color yellow; but antenna dark brown; vertex black; elytra basally and apically darkened; outer margins of tibiae black ( Fig. 4 B). Antenna filiform, antennomere I strongly swollen in male ( Fig. 6 A), length ratios of antennomeres I–XI 1.0: 0.4: 0.6: 0.6: 0.6: 0.6: 0.6: 0.6: 0.6: 0.6: 0.7, length to width ratios of antennomeres I–XI 2.3: 1.7: 2.7: 3.0: 3.0: 3.0: 3.0: 3.4: 3.2: 3.3: 3.6. Elytra 1.8 x longer than wide, surface with erect, dense, elongate setae, punctures fine. Apical margin of last abdominal ventrite with two incisions in males ( Fig. 6 B). Penis ( Figs 6 C–6D) extremely slender, 8.5 x longer than wide, parallel-slided; apex of dorsal surface with extremely deep median notch; apex of ventral surface widely rounded, with shallow median groove; weakly curved in lateral view, apex with narrow notch between dorsal and ventral surfaces; ventral surface smooth. Endophallic spiculae long, about 0.6 x as long as penis, with a cluster of setae on apex of median spicula, apically widened; two pairs of lateral spiculae as long as median spicula, apices of inner pair more or less swollen, basally conjoined; one pair of lateral spiculae at middle elongate and apically tapering, one pair of ventral spiculae at base elongate and apically tapering.

Variability. One male possessed unmodified antennomere I (not swollen, 3.3x longer than wide), and relatively smaller lateral and ventral endophallic spiculae ( Figs 6 E–6F).

Differential diagnosis. Doryscus krausi sp. nov. adults are similar to those of D. scapus Mohamedsaid in possessing swollen first antennomeres in males, but D. krausi differs by possessing black vertex, a pair of elongate and apically tapering spiculae at base, and at middle of endophallic spiculae, respectively. These are in contrast to the yellow vertex and two pairs of horn-like basal and median endophallic spiculae in D. scapus .

Etymology. The new species is dedicated to Zdeněk Kraus, who collected the type specimens. Distribution. Laos, Thailand.

Figures

FIGURE 4. Habitus of Doryscus species, dorsal view. 4 A. D. indochinensis Lee, sp. nov.; 4 B. D. krausi Lee, sp. nov.; 4 C. D. kubani Lee, sp. nov.; 4 D. D. varians Gressitt & Kimoto; 4 E. D. varians Gressitt & Kimoto, color variation; 4 F. D. varians Gressitt & Kimoto, color variation.

FIGURE 6 Diagnostic characters of Doryscus krausi Lee, sp. nov. 6 A. Antenna, male; 6 B. Apical margin of abdominal ventrite V, male; 6 C. Penis, dorsal view; 6 D. Penis, lateral view; 6 E. Endophallic sclerites, variation, dorsal view; 6 F. Endophallic sclerites, lateral view.