Doryscus testaceus Jacoby, 1887

Lee, Chi-Feng, 2017, Revision of the genus Doryscus Jacoby (Coleoptera: Chrysomelidae: Galerucinae), Zootaxa 4269 (1), pp. 1-43 : 18-21

Doryscus testaceus Jacoby, 1887

( Figs 9 A–9B, 10)

Doryscus testaceus Jacoby, 1887: 115 ; Kimoto, 2003: 31.

Types (n= 2). Lectotype ♀ ( BMNH), here designated, labeled: “ Ceylon. / G. Lewis, 1910-320 [p, w] // Doryscus / testaceous [sic!] / Jac. [h, b] // Type / H. T. [p, circle label with red border]” . Paralectotype: 1♀ ( MCZC), labeled: “ Ceylon / Lewis [h, w] / 1st Jacoby / Coll. [p, w] // Doryscus / testaceus / Jac. [h, b] // Type [p] / 18501 [h, r]”.

Additional specimens (n= 13). SRI LANKA. 1♂ (BMNH), Babapitiya, VI.1892, leg. H. P. Green; 1♂ (NHMB), Danbulla env., 19.IV.–9.V.1991, leg. J. Kallbáč; 2♂♂ (BMNH), Kandy, VI.1908, leg. C. B. Bryant; 1♂ ( NHMB), same locality, 4.II.1954, leg. L. Horton’s & F. Keiser ; 4♂♂ ( NHMB), same locality, 1–18.IV.1991, leg. J. Kallbáč ; 1♀ (EUMJ), Kandy: Hills South of the Lake, 18.II.1974, leg. A. Otake; 1♂ ( EUMJ), same locality, 4.III.1975, leg. A. Otake ; 1♂ (EUMJ), Kandy: Uda wattekele Sanctuary, 1.IV.1975, leg. A. Otake; 1♀ (MNHUB), Nalanda, leg. W. Horn.

Redescription. Length 3.5–4.8 mm, width 1.5–2.0 mm. General color yellow, but suture and lateral margins of elytra black ( Fig. 9 A); some individuals with black stripes reduced ( Fig. 9 B). First antennomere not modified in males ( Fig. 10 A), length ratios of antennomeres I–XI 1.0: 0.4: 0.6: 0.9: 0.8: 0.8: 0.9: 0.8: 0.8: 0.8: 1.0, length to width ratios of antennomeres I–XI 4.0: 1.7: 2.8: 3.7: 3.7: 4.1: 4.2: 4.9: 5.0: 4.6: 5.7; first antennomere in female more slender ( Fig. 10 B), length ratios of antennomeres I–X (XI lost) 1.0: 0.4: 0.6: 0.8: 0.8: 0.8: 0.8: 0.8: 0.8: 0.8, length to width ratios of antennomeres I–X 4.5: 1.9: 3.0: 3.9: 3.9: 4.2: 4.3: 4.2: 4.2: 4.2. Elytra 1.9 x longer than wide; surface with erect, pale, dense, elongate setae; and with coarse punctures. Apical margin of last abdominal ventrite with two well developed incisions in male ( Fig. 10 G); but medially and slightly depressed in females ( Fig. 10 H). Penis ( Figs 10 C–10D) extremely slender, 8.1 x longer than wide, gradually narrowed towards apex; apex of dorsal surface with moderately deep notch; apex of ventral surface with shallow notch; almost straight in lateral view, apex with groove between dorsal and ventral surface; ventral surface smooth. Endophallic spiculae extremely elongate, 0.8 x as long as penis, two pairs of median spiculae, one pair extremely slender, apices filiform and curved upwards, the other pair short and apices with four teeth; one apical endophallic spiculum present between two median endophalic spiculae, apex curved downwards, medially widened; two pairs of dorsal spiculae at middle of median endophallic spiculae, one pair extremely slender, almost straight, the other pair very short; one pair of ventral endophallic spiculae slender. Gonocoxae ( Fig. 10 E) slender, 6.1 x longer than wide, sides slightly narrowed at apical 1/10; apices narrowed rounded; inner margins closely approximate from apex to apical 1/3, apex with nine setae; extremely slender from midpoint to base but abruptly widened at base. Ventrite VIII ( Fig. 10 F) weakly sclerotized; spiculum elongate; apex square, apical margin truncate, with dense, short setae; disc with several long setae at sides. Receptacle of spermatheca ( Fig. 10 I) slightly swollen, narrowly separated from pump; pump much narrower and strongly curved; proximal spermathecal duct slender and much narrower than receptacle; shallowly projecting into receptaculum.

Differential diagnosis. Doryscus testaceus adults are similar to D. varians in color patterns but can be distinguished by presence of dense, elongate, erect setae on the elytra.

Distribution. Sri Lanka.

Figures

FIGURE 9. Habitus of Doryscus species, dorsal view. 9 A. D. testaceus Jacoby; 9 B. D. testaceus Jacoby, color variation; 9 C. D. nepalensis Lee, sp. nov.; 9 D. D. nepalensis Lee, sp. nov., color variation; 9 E. D. nepalensis Lee, sp. nov., color variation; 9 F. D. niger Medvedev & Sprecher-Uebersax.

FIGURE 10. Diagnostic characters of Doryscus testaceus Jacoby. 10 A. Antenna, male; 10 B. Antenna, female; 10 C. Penis, dorsal view; 10 D. Penis, lateral view; 10 E. Gonocoxae; 10 F. Abdominal ventrite VIII. 10 G. Apical margin of abdominal ventrite V, male; 10 H. Apical margin of abdominal ventrite V, female; 10 I. Spermatheca.