Doryscus boreri, Lee, Chi-Feng, 2017

Lee, Chi-Feng, 2017, Revision of the genus Doryscus Jacoby (Coleoptera: Chrysomelidae: Galerucinae), Zootaxa 4269 (1), pp. 1-43 : 32-35

Doryscus boreri sp. nov. ( Figs 16 B–16D, 18)

Doryscus testaceus: Jacoby, 1896a: 498 . Misidentification

Types (n= 4). Holotype ♂ ( NHMB): INDONESIA. Sumatra : Jambi pr.: Kerinci Seblat N. P.; 7km E Kayuaro ; Mt. Tujuh ; 1750± 250m; 1°45’S 101°25’E; 25.II.–2.III.2003, leg. Dembický. Paratypes: 2♀ ( NHMB), same data as holotype ; 1♀ ( BMNH), Si-Rambe , XII.1890 – III.1891, leg. E. Modgliani, Jacoby Coll. 1909-28 a, with another label: “Museo Civ. Genova”.

Description. Length 4.0– 4.9 mm, width 1.8–2.0 mm. General color yellow; head black but yellow above eyes; elytral suture, lateral and basal margin black but apically abbreviated; meso- and metathoracic, and abdominal ventrites blackish brown; apices of hind femora, and tarsi darkened ( Fig. 16 B). Antennae filiform, antennomere I not modified in males ( Fig. 18 A), length ratios of antennomeres I–XI 1.0: 0.4: 0.7: 0.7: 0.8: 0.8: 0.8: 0.8: 0.8: 0.8: 0.7, length to width ratios of antennomeres I–XI 3.9: 1.8: 3.1: 3.4: 3.4: 4.3: 4.1: 4.0: 3.9: 3.9: 4.6; narrower in females ( Fig. 18 B), length ratios of antennomeres I–XI 1.0: 0.4: 0.7: 0.8: 0.8: 0.9: 0.9: 0.8: 0.8: 0.8: 1.0, length to width ratios of antennomeres I–XI 3.9: 1.9: 3.8: 4.7: 4.8: 4.9: 5.0: 4.8: 4.8: 4.7: 5.5. Elytra 1.7 x longer than wide, with erect setae dense and elongate, puncutres fine. Apical margin of last abdominal ventrite with two shallow incisions in males ( Fig. 18 G); but widely rounded in female ( Fig. 18 H). Penis ( Figs 18 C– 18D) extremely slender, 7.4 x longer than wide, parallel-sided, apex of dorsal surface tapering, with membranous opening; apex of ventral surface with short median groove; straight in lateral view, apex with groove between dorsal and ventral surface; ventral surface smooth. Internal sac with endophallic spiculae elongate, about 0.8 x as long as penis, apices trilobed, median lobe extremely slender, strongly and apically curved, with cluster of at base, lateral lobes deeply bifurcate, elongate with apices swollen and circular, with dense long setae along inner margin at middle; five pairs of short, horn-like spiculae at middle, posterior pair largest; with a short erect horn-like spicula at middle. Gonocoxae ( Fig. 18 E) extremely slender, 7.2 x longer than wide, sides slightly narrowed at apical 1/10; apices narrowed rounded; inner margins narrowly approximate from apex to midpoint, apex with nine setae; extremely slender from midpoint to base but abruptly widened at base. Ventrite VIII ( Fig. 18 F) well sclerotized; spiculum elongate; apex square, apical margin truncate, with sparse short setae; disc with several long setae at sides. Receptacle of spermatheca ( Fig. 18 I) strongly swollen; pump much narrower and strongly curved, apically tapering; proximal spermathecal duct slender, basally widened, deeply projecting into receptaculum.

Color variability. Extremely variable. One female has a yellow abdomen and yellow elytra with a wide transverse black stripe along the base and one pair of large black spots near the apices, head black except above eyes, metathoracic ventrites black except bases ( Fig. 16 C). Another female has a yellow body with black mouthparts, frons, and anterior area of the vertex ( Fig. 16 D).

Differential diagnosis. Doryscus boreri sp. nov. adults can be distinguished those of D. sumatrensis sp. nov. by color patterns, although the former display color variation. Doryscus boreri sp. nov. adults have black anterior areas of the heads but the heads are totally yellow in D. sumatrensis sp. nov. In addition, both species are easily identified by the characteristic structure of the endophallic sclerites within the penis. Females of both species can be separated by the morphology of the spermathecae: with the base of the proximal spermathecal duct in D. sumatrensis sp. nov. wide in contrast to the moderately wide base of that structure in D. boreri sp. nov.

Remarks. Two specimens collected from Si-Rambe were misidentified as Doryscus testaceus by Jacoby (1896). They are members of D. boreri sp. nov. and D. sumatrensis sp. nov. respectively. Etymology. This new species is dedicated to Matthias Borer (Curator, NHMB), who encouraged me to study leaf beetles.

Distribution. Indonesia (Sumatra).

Figures

FIGURE 16. Habitus of Doryscus species, dorsal view. 16 A. D. barclayi Lee, sp. nov.; 16 B. D. boreri Lee, sp. nov.; 16 C. D. boreri Lee, sp. nov., color variation; 16 D. D. boreri Lee, sp. nov., color variation; 16 E. D. javanensis Lee, sp. nov.; 16 F. D. javanensis Lee, sp. nov., color variation.

FIGURE 18. Diagnostic characters of Doryscus boreri Lee, sp. nov. 18 A. Antenna, male; 18 B. Antenna, female; 18 C. Penis, dorsal view; 18 D. Penis, lateral view; 18 E. Gonocoxae; 18 F. Abdominal ventrite VIII. 18 G. Apical margin of abdominal ventrite V, male; 18 H. Apical margin of abdominal ventrite V, female; 18 I. Spermatheca.